Publications

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2017
2016
2015
(IIRR) TO,(KAPP) FO,(KAPP) EIC,(MKU) NJH,(IIRR) EM,(IIRR) CM,(IIRR) NB. Fruits of our toil. Nairobi: Ministry of Agriculture, Livestock and Fisheries Cathedral road, Nairobi; 2015.Fruits of our toil kapap_book_d10-1.pdf
Evans W, Nderitu, J., Cheminingwa. management bean pests. Nairobi; 2015.mgt_of_snap_beans_pests.pdf
J. M, J.N. K, D. K, G.O. A, J.H N. "Prolonging the shelf-life of seed potato tubers at farm level: Cold storage or Diffused light store." International Journal of Horticulture. 2015;5(12):1-4.prolonging_the_shelf.pdf
2014
Kasina1 M, Herren-Gemmill B, Wasilwa L, Martins D, Nderitu JH. "Ecological Approaches: Entomological diversity including pollinators.". In: International Symposium on Agroecology for Food Security and Nutrition. FAO Headquarters, Rome; 2014.abstract.pdf
"Efficacy of potassium salts of fatty acides in the management of thrips and whiteflies on snapbeans.". In: HAK. Nairobi; 2014. Abstractbook-of-abstracts-agrs-conference-dec-2014-final.pdf

EFFICACY OF POTASSIUM SALTS OF FATTY ACIDS IN THE MANAGEMENT OF THRIPS AND WHITEFLIES ON SNAP BEANS
G. O. Wafula*, J. W. Muthomi, J. H. Nderitu and G. N. Chemining’wa
Department of Plant Science and Crop Protection,University of Nairobi. P. O Box 29053-00625 Kangemi, Nairobi, Kenya
Email: ongoya@gmail.com, Tel. 0723144690
Abstract
Snap bean farmers mainly rely on chemical pesticides to manage insect pests and diseases but the introduction of strict maximum residue levels (MRLs) by European markets pose a challenge to the use of pesticides. This has necessitated the search for alternative pest management options that do harmful residues on produce. Therefore, this study was carried out to determine the efficacy of potassium salts of fatty acids as alternative to synthetic chemicals in the management of snap bean pests. Field experiments were carried out in farmers’ fields in Mwea and Embu in 2013 for two cropping cycles. Potassium salts of fatty acids at 0.5%, 1% and 1.5% spray solution were applied weekly starting from three weeks after emergence (WAE) until early podding. The efficacy of the different concentrations was evaluated by assessing population of thrips, whitefly, and pest damaged pods, in addition to pod yield.. The application of potassium salts of fatty acids at 1% and 1.5% of spray solution significantly (P<0.05) reduced white fly and thrips populations by up to 61% and 69% respectively. Pod damage due to thrips was also significantly (P<0.05) reduced by up to 83% and marketable pod yield was significantly (P<0.05) increased by up to 151%. The results demonstrated that potassium salts of fatty acids are a viable alternative to synthetic chemical pesticides thereby enabling farmers to meet the strict European markets maximum residue level requirements.

Key words: Phaseolus vulgaris L., potassium salts of fatty acids, pesticide residues, market access

"Bernard Ouma, James Muthomi, John Nderitu, John H. Nderitu, Faith Torotich (2014). Pest management practices and compliance to market stawndards among French Bean Farmers. 14th Conference on HAK, Nairobi, 1-5th December 2014."; 2014. Abstract

PEST MANAGEMENT PRACTICES AND COMPLIANCE TO MARKET STANDARDS AMONG FRENCH BEAN FARMERS

Bernard Ouma, James Muthomi, John Nderitu2 and Faith Toroitich
Department of Plant Science and Crop Protection, University of Nairobi, P. O. Box 30197-00100, Nairobi, Kenya
2. Mount Kenya University, P. O. Box 342-01000, Thika, Kenya
Abstract
The EU commission increased to 10% sampling and pesticide residue analysis of French beans and peas imported from Kenya. This resulted in a 25% dip in bean sales in January 2013. This study aimed at determining pest management strategies used by small scale French bean farmers. A survey to determine farmers’ pest management practices was done in Embu east and Mwea east district, where 32 and 38 farmers were from Embu east and Mwea east, respectively. The farmers considered French beans farming as an important source of income, and up to 50% of the farmers had been in French beans production for a period of three years and more. Most of farmers in the study area entirely relied on synthetic pesticides for pest and disease control. White fly was the major insect pest while rust was the major disease as identified by the majority of farmers. Less than 30% of the farmers were involved in the implementation of GLOBALGAP, with 3.1% of the farmers being certified. The findings showed that farmer’s pest management practices were incompatible with good agricultural practices and export market standards. There is a need to sensitize farmers on the use of alternative pest management strategies and requirements of the export market standards.
Key words: French beans, export market requirements, maximum residue levels, Global G.A.P

Muthoni J, Kabira JN, Kipkoech D, Abong GO, Nderitu. JH. "Feasibility of Low-Cost Seed Potato Storage in Kenya: The Case of Diffused Light Storage in Nyandarua County." Journal of Agricutlural Sciences . 2014;6(1): 59-65.feasibility_of_low-cost_seed_potato_storage_in_kenya_.pdf
"G. O. Wafula, J. W. Muthomi, J. H. Nderitu and G. N. Chemining'wa (2014). Management of snapbean pests by integrated seed dressing, foliar sprays and intercropping with maize. Conference on HAK, Nairobi, 1-5th December 2014."; 2014. Abstract

MANAGEMENT OF SNAP BEAN PESTS BY INTEGRATING SEED DRESSING, FOLIAR SPRAYS AND INTERCROPPING WITH MAIZE
G. O. Wafula*, J. W. Muthomi, J. H. Nderitu2 and G. N. Chemining’wa
Department of Plant Science and Crop Protection,University of Nairobi. P. O Box 29053-00625 Kangemi, Nairobi, Kenya
2. Mount Kenya University, P. O. Box 342-01000, Thika, Kenya
Email: ongoya@gmail.com, Tel. 0723144690
Abstract
Insect pests remain a major constratint in the production of snap beans and farmers mainly rely on chemical pesticides to manage the insect pests and diseases. However, the introduction of maximum residue levels (MRLs) for export vegetables by European markets pose a challenge to the use of pesticides. This study was carried out to develop sustainable options of managing snap bean pests and reducing chemical residues on snap bean produce.
Field experiments were carried out in farmers’ fields in Mwea and Embu from July 2013 to January 2014 for two planting cycles under irrigation. The integrated pest management strategies evaluated included: i) seed dressing only, ii) seed dressing followed by three neem sprays, iii) seed dressing followed by two pyrethrid sprays and one neem spray, iv) seed dressing followed by three pyrethrin sprays and intercropping snap bean with maize, v) seed dressing followed by two pyrethrin sprays plus one spray with a biological product, vi) seed dressing followed by two neem sprays plus one spray with a biological product, and vii) two pyrethrin sprays and one neem spray only. The data collected included: emergence, plant stand, nodulation, thrips population, bean stem maggot population, whitefly population, yield and pest damage. The combination of seed dressing, two pyrethrin sprays and neem applied at the vegetative stage, early flowering and early podding reduced white fly and thrips population by up to 54% and 60% respectively. Similar results were also observed on plots where seeds dressing was done before planting combined with intercropping with maize plus three pyrethrin sprays at the vegetative stage, early flowering and early podding. Seed dressing had a direct effect on the bean stem maggots that attack the seedling at a very young stage. Spraying with pyrethrin sprays had a quick knockdown effect on the population of whitefly and thrips while the maize intercrop also reduced the pest population. These options also reduced pod damage due to thrips by up to 75 and 93% and increased yield of extra-fine by up to 157 and 162% and fine pods by up to 148 and 133%. The results showed that seed dressing followed by two pesthrin sprays at the vegetative stage and early flowering stage plus a single spray with Nimbecidine at early podding, sprays and intercropping with maize were effective in managing snap bean pests. This demonstrates that integrated pest management options would be viable alternatives to chemical pesticides thereby enabling farmers meet the strict maximum chemical residue level requirements set by European consumers.

Key words: Phaseolus vulgaris L, seed dressing, bio-pesticides, intercropping, integrated pest management

GN C’wa, OM K, JH N. "Status, Challenges and Marketing Opportunities for Canning Navy Bean in Kenya." African Journal of Food, Agriculture, Nutrition and Development. 2014;14(14(5)20272-2087).status_challenges_and_marketing_opportunities_for_2014.pdf
2013
Nderitu JH, Kabira J, Tigoni David Kipkoech, MKU T, Mathenge S. ANNUAL PLANNING WORKSHOP FOR NCST SEED POTATO PROJECT. THIKA: KARI; 2013.annual_planning_workshop_for_ncst_seed_potato_project_final.pdf
"Evaluation of rice genotypes for susceptibility to African White Rice Stem Borer, Maliarpha separatella Rag." International Journal of Agri-business, innovation and rural development . 2013;1(1):35-45.
John Nderitu1, Kaburu D. Mishek2, Kasina3 JM. "Evaluation of Safe Pesticides and Varieties for Management of Insect Pests in Snap beans in Kenya.". In: 1Mount Kenya University, Research and Development. MKU; 2013.nderitu_et_al-poster_tropentag_20131.pptx
Isutsa PDK, Hutchinson DMJ, Otiato DDA, Kioko DE, Muthoka DPN, Mulwa PRMS, Matofari DJ, Musieba MF, Joseph W. KAPAP Vegetables VC proposal 2ND PHASE- 30-10-2013. Nairobi; 2013.kapap_vegetables_vc_proposal_2nd_phase-_30-10-2013.pdf
Muthomi JW;, Nderitu JH;, Olubayo FM;, Kabira JN;, Cheminin’wa GN;, Kiretai SM;, Aura JA;, Muindi EM. "Management Of Potato Viruses In Seed Potato Production Using Border Crops."; 2013. Abstract

Field experiments were conducted over two croppi ng seasons to investigate the effectiveness of border crops in managing potato aphids and the associated viruses in seed potato production. Potato plots were surrounded with maize, sorghum and wheat borde rs. Aphid population was monitored on leaves and on yellow sticky traps. Other data collected included virus disease incidence and tuber yield. The border crops reduced aphid popula tion on leaves compared to non-bordered potato plots. More alate aphids we re caught on yellow sticky traps placed inside potato plots than on traps placed inside the border crops. In addition, virus disease incidence was reduced in all plots surrounded by the border cr ops. However, plots surrounded by border crops had reduced tuber yield, although the yield of s eed grade was increased. The results indicated that use of border crops would be beneficial in the management of virus diseases in small-holder seed potato production.

Nderitu, J., Evans W, Cheminingwa. Management of thrips. Nairobi; 2013.mgt_of_thrips119.pdf
Kasina, Muo; Nderitu JH. Policy Implementation And Its Economic Impact On Potato Marketing Value Chain In Kenya.; 2013. Abstract

Potatoes (Solanum tuberosum L.) are second in importance after maize in Kenya as food crop. It is grown mainly by small scale farmers in more than 100,000 ha country wide producing more than 1 million tonnes annually. The marketing value chain has been described as ineffective, with farmers getting far much lesser compared with other players. Recognizing this, the Government of Kenya developed laws in 2005 to streamline the chain and ensure farmers gain from the potato production. It also established some specific laws in 2008 to interpret the 2005 laws in target chain levels. This study was carried out between December 2009 and February 2010 to monitor implementation, enforcement and economic impact of legal notice no. 113 of 2008 of the Government of Kenya using formal questionnaires administered to traders and farmers in selected seven markets and regions. Information was also obtained from focused group discussions as well as stakeholder participation in a workshop. The findings show that traders and farmers are aware of the regulations but are not implementing them. Farmers had higher (97%) knowledge of regulations compared with traders (92%). The major reasons cited by farmers for not being able to implement the regulations included cartels, lack of storage facilities and information about the potato production costs and prevailing market prices at any given time. Calculations show that the contribution of potatoes to the Kenyan economy is 300% higher than what is in government records. This study provides more evidence of the effect of the legal notice on the potato marketing value chain in Kenya and policy recommendations to ensure enforcement of the regulations and streamline the potato value chain.

2012
Wafula E, Nderitu, J. Efficacy of potassium . Nairobi; 2012.efficacy_of_potasium_salts1102.pdf
Gachu. S. M., Muthomi JW,, Narla RD, Nderitu, J., FM O, Wagacha JM. "Management of thrips ( Thrips tabaci ) in bulb onion by use of vegetable intercrops." International Journal of AgriScience . 2012; 2 (5):293-402.2012-management_of_thrips_in_bulb_onion_by_use_of_veg_intercrops.pdf
Kipkoech, D. N.;, Ng’anga NW;, Kabira JN;, Abong GO;, Nderitu JH. "On‐farm seed potato storage practices in Kenya: A case study of Nyandarua."; 2012.
Dunstan Kaburu, Nderitu JH, John Kamanu, Chemining’wa G. Snap bean Integrated Crop Management booklet. UON; 2012.snap_bean_integrated_crop_management_booklet.doc
CHAIRMAN PROFJOHNHURIANDERITU, MEMBER DRRONALDMAATHAI, MEMBER DRJOHNSHIUNDU, MEMBER MADAMBIBIANNEWANJA, MEMBER DRKIMAMOGITHUI, MEMBER DRPAMELAOCHIENG, MEMBER DRFRANCISMUREGI, PERSON MRMULATINYUKURIRESOURCE, PERSON PROFPAULOKEMORESOURCE, PERSON PRORAPHAELWAHOMERESOURCE, SECRETARY MRAFUBWAMUSUMI. TASKFORCE REPORT ON MKU POSTGRADUATE TRAINING . Nairobi: MKU; 2012.report_on_postgraduate_training_at_mku_updated.pdf
2011
Mishek DK;, Nderitu J, Kasina JM;, Chemingwa GN;, Olubayo F. "Evaluation of neonicotinoid seed dressing formulations for control of bean fly (OPhiomyia spp.) in snapbeans in Mwea, Central Kenya.". In: NCST 4th National Conference for dissemination of research results and exhibition of innovations held at KICC, . Nairobi; 2011.
Muthomi JW;, Muinde EM;, Nderitu JH;, Olubayo FM;, Kabira F. "Integrated management of aphid-transmitted viruses in potato (Solanum tuberosum L.).". In: Agro2011. Nairobi; 2011.
Chemingwa GN,; Kitonyo OM;, Nderitu JH. "Status, constraints and marketing opportunities for canning Navy beans in Kenya.". In: Agro2011. UoN; 2011.
Were S,; Olubayo, F.; Nderitu KKJH; D;, Nderitu JH;, Kilalo D;, Koech A;. " Resistance of potato varieties to potato tubermoth (phthorimaea opercullela (Zeller). ). .". In: UON Agro 2011. C.A.V.S; 2011.
Kamanu JK;;, Chemingwa GN;, Nderitu JH, Ambuko J. "Effect of varying inorganic nitrogen fertilizer regimes on growth, yield and quality of snapbeans.". In: Agro2011. UoN; 2011.
Munysa; A, Kabutbei JL,.; Chemingwa GN;, Kimani PM;, and Mburu MW, Nderitu JH. " Thumbnail Evaluation of drought tolerance mechanisms in Mesoamerican dry bean genotypes .". In: agro 2011. Vol. 1.; 2011.
Nderitu JH;, Kasina M;, Muchirah N. "Commercialization Of Patented Herbal Medicinal Products In Kenya."; 2011.
mugerwa S, Nyangito M, Nderitu J, and Chris Bkuneta DME, Mpaire D, Zziwa E. "Farmers ethno- ecological knowledge of the termite problem in semi-arid Nakasongola." African Journal of Agricultural Research . 2011;6(13):3183-3191.farmers-_ethno-ecological_knowledge_of_the_termite.pdf
Muthomi JW;, Muinde EM;, Nderitu JH;, Olubayo FM;, Kabira FM. "Integrated management of aphid-transmitted viruses in potato (Solanum tuberosum L.)."; 2011.
Muthomi JW;, Gachu SM;, Narla RD;, Nderitu J. "Management of thrips in bulb onions using vegetable intercrops."; 2011.
Nderitu JH;, Kasina M. "Proceeding of the National public debate on GMO."; 2011.
Muthomi JW, Kinyungu TN, Nderitu JH, Olubayo FM;, Kabira JN. "Spatial Arrangement Of Maize As Border Crop To Manage Aphids And Aphid-Transmitted Viruses In Potato.". 2011. Abstract

Field experiments were conducted over two growing seasons to determine the effect of spatial arrangement of maize as border crop to manage aphid infestation and aphid-transmitted virus diseases in potato (Solanum tuberosum L.). Maize was planted at a distance of 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 m from the potato crop. Aphid infestation and incidence of virus infection was monitored over the growth period of potato. Aphids were recorded on potato leaves and in water pan traps while virus infection was determined by visual symptoms on the potato plant. At harvest, potato tubers were graded into ware, seed, and chatts and weighed. The results show that placement of maize border up to 0.5 m and 1.0 m reduced aphid population and virus disease incidence by up to 48%. The maize borders had no effect on the yield of seed potato grade but only on the ware. Placing maize border at 0.5m had the greatest reduction of ware potato yield by 48%. Maize borders placed up to 1m from the potato crop would be effective in the management of potato aphids and aphid-transmitted virus diseases. This study shows that the technology would be ideal for propagation plots in small scale seed potato production.

2010
Muthomi JW;, Kinyungu TN;, Nderitu JH;, Olubayo FM;, Kabira J. "Effect of maize border crop placement distance on aphid population and aphid-transmitted virus diseases in potato.". In: 12th KARI Biennial Scientific Conference, KARI,. Nairobi; 2010.
Kasina M;, Kraemer M;, Nderitu JH;, and MC, Wittmann D. "Some Aspects of squash(Cucurbita pepo L.) pollination ecology in Kenya.". In: KARI Scientific Conference, Nairobi,. Nairobi; 2010.
Kwach JK;, Onyango MA;, Muthomi JW;, Nderitu JH. "Baseline survey for status of Banana Xanthomonas Wilt in Kenya."; 2010.
Machangi JM;, Gitonga LM;, Nderitu JH;, Maniania NK;, Kabira JN. "Biological Control Agents Of Aphids (Homoptera: Aphididae) On Potatoes(Solanum Tuberosum L.) In Kenya.".; 2010.
Tende RM,; Mugo, S. N.;, Nderitu JH;, Olubayo, F., M.Bergvinsone J. "Evaluation of Chilo partellus and Busseola fusca susceptibility to Endotoxin in Bt maize." . Crop Protection . 2010;2(29):115-120.
Karaya H;, Mugo S;, Njoroge K;, Ariga E;, Nderitu JH;, Kanampiu. "Screening gene bank maize accessions for Straiga hermontica resistance."; 2010.
n Kasina M;, Hagen M;, Kraemer M;, Nderitu JH;, Martius C;, Wittma. "Some aspects of squash ( Cucurbita pepo L.) pollination ecology in Kenya."; 2010.
2009
Nderitu JH. "Curriculum development and approval process .". In: food safety. Nairobi; 2009.
Nderitu JH;, Mwangi F;, and Nyamasyo G, Kasina M. "Evaluation of cropping systems as a strategy for managing flower thrips in Kenya." Int. J. Sustain. Cro . 2009; 4(6): 22-25.evaluation_of_cropping_systems_as_a_strategy_for_m_1.pdf
J.W. Muthomi, J.N. Nyaga, F. M. Olubayo, J.H.Nderitu, J.N. Kabira, S.M. Kiretai, and AJA, Wakahiu M. "Incidence of aphid-transmitted viruses in farmer-based seed potato tubers in Kenya." Asian journal of plant science. 2009;8(2):166-171.incidence_of_aphid-transmitted_viruses_in_farmer-based_seed_potato_tubers_in_kenya.pdf
Nderitu, J., Martha Sila, and Nyamasyo G, Kasina M. "Insects associated with sweet potatoes (Ipomea batata (L) Lamk) in Eastern Kenya." Int. J. Sustain. Crop Prot.. 2009;1(4):14-18.insect_species_associated_with_sweet_potatoes_ipom_1.pdf
Nderitu H, Kasina M. "IPM framework for KAPAP Projects, KAPAP, Nairobi, Kenya.". In: Projects, KAPAP, Nairobi, Kenya. Nairobi; 2009.
Nyaga JN, J.W. M, Olubayo FM;, Nderitu JH;, and Kiretai SM, Aura JA. "Seed potato production and occurrence of Transmitted viruses in Nyandarua District. 7th Workshop on sustainable horticultural production in the tropics. Universit." World J. Agric. Sci. . 2009;6 (3):731-734.
Kidata GN, Nderitu JH. "Survey, biology and control of agromyzid beanflies in common beans (Phaseolus vulgaris L.) in Kenya.". 2009. Abstract

The common beans are the most widely grown pulses in Kenya. They are intercropped with such crops as maize, sorghum, cassava, in high and low potential areas. They are consumed as green leaves, green pods and dry beans and form an economic source of protein to the bulk of Kenya population. However, despite their importance as a major source of protein, their yields are variable for a number of reasons. One of the major limitations to obtaining high yields include insect pests. Among the pests of the beans, certain agromyzid beanflies have been reported to cause heavy losses to beans in Kenya. The control measures for the beanflies include mainly seed treatment with aldrin or dieldrin. However, these insecticides are being withdrawn because of their persistence in the environment. Therefore, the objectives of the research project are as follows: 1) to map the distribution of beanflies in bean growing areas in Kenya in four cropping seasons. 2) to identify the losses of common beans due to beanflies in farmers fields in four seasons. 3) To relate the biology of beanflies to the growth stages of the common beans grown in the field for two seasons. 4) to determine the effectiveness of the insecticides and natural enemies in the control of beanflies on common beans grown in the field for four seasons. 5) to investigate the incidence of beanflies and its natural enemies in different cropping patterns of common beans grown in the field for four seasons. 6) To evaluate soil, seed, foliar and spray treatments for control of beanflies. The project will evolve an integrated control strategy of beanflies for the poor resource farmer. The results will be obtained by undertaking a survey in farmers fields, field and laboratory experiments at the research centres. The cost for all the research activities will be U$12,588. The project is expected to take two years

Muindi EM, Muthomi W, Nderitu JH, Olubayo FM, Kabira JN, Chemining'wa GN, Kiretai SM, Aura JA. "Use of cereal border crops in management of aphid-transmitted viral diseases during seed potato (Solanum tuberosum) production.". 2009.
Kasina M;, Nderitu HH;, Nyamasyo G;, Waturu C;, Olubayo F;, and Obudho E, Yobera D. "With-plant distribution and seasonal population dynamics of flower thrips (Thysanoptera: Thripidae) infesting French beans (Phaseolus vulgaris L.) in Kenya.". In: UNDP.; 2009.
2008
Mulinde E;, Muthomi JW;, Olubayo FM, Nderitu JH;, Kabira. "Management of potato viruses in seed potato production using border crops.". In: KARI Scientific Conference, Nairobi,. Nairobi; 2008.management_of_potato_viruses.pdf
and Nyamasyo D, Nderitu JH. "Nyamasyo, D. and Nderitu, J. H. (2004 ). Lecture notes on invertebrate animals.". In: Triennial Symposium for International Society for Tropical Root and Tuber crops- Africa Branch. Nairobi; 2008.
Mwaniki SW;, Nderitu JH;, Olubayo F;, Kimenju JW;, Nguyen K. "Factors influencing the occurrence of entomopathogenic nematodes in the Central Rift Valley region of Kenya." : Africa Journal of Ecology . 2008;46(1): 79-84.
Nyaga JN;, J.H.; N, Olubayo F;, Kabira. "Incidence of aphids and aphid-transmitted viruses in farmer-based seed potato production ." Journal of Ecology . 2008;46(1): 79-84.
J..W. Kimenju, A.M. Kagundu, J.H.Nderitu, F. Mambala, and MGK, Kariuki GM. "Incorporation of Green Manure Plants into Bean Cropping Systems Contribute to Root-Knot Nematode Suppression." Asian journal of plant science. 2008;7:404-408.
Olubayo; F, Kibaru; A, Nderitu; J, Njeru; R, and SS, Kasina M. "Management of aphids and aphid-transmitted viruses in stored potatoes in Kenya." Int. J. Sustain. Crop Prod. . 2008;5(3):40-45.management_of_aphids_and_aphid-transmitted_viruses_in_stored_potatoes_in_kenya..pdf
and Kasina J.M. and Nyamasyo, G.N; Waturu ACN, Nyamasyo GN;, and Waturu CN, Aura. "Management of thrips (Thysanoptera; Thripidae) in Kenya; Economics of Insecticide applications." J. Entomol. . 2008;5(3):48.
Muindi, E.M., Muthomi, J.W, Nderitu, J., Olubayo, F., Kabira, Chemining’wa, and Kiretai SM, Aura JA. "Use of cereal border crops in management of aphid-transmitted viral diseases during seed potato (Solanum tuberosum) production." African Journal of horticultural science. 2008:69-78.
HURIA PROFNDERITUJOHN. "J. W. Muthomi; P. E. Otieno; G. N. Chemingw.". In: J. Entomol. 5(3): 156-163. Nderitu, J, H, and Kasina, J, M.; 2008. Abstract
OBJECTIVE: To determine the pattern of occurrence of dental injuries in the 0-15 year-olds. DESIGN: A retrospective study. SETTING: Kenyatta National Hospital, Nairobi. SUBJECTS: Five hundred and five patient records with dental injuries were retrieved and analysed. RESULTS: A total of 505 patient records with dental injuries were retrieved and analysed. Most of the injuries were recorded in the year 1999 (22.2%). Boys were more affected (63.0%) than girls (37.0%). The main presenting complaint recorded was pain (75.8%).The majority of the patients (69.5%) presented for treatment during the same day or the day after trauma. Falls were the leading cause of injuries (73.5%). Most injuries involved two teeth (47.1%) and the maxillary central incisors were the most affected teeth both in the primary (67.5%) and permanent (64.0%) dentitions. Luxation injuries were the most common type of dental trauma with 47.5% occurring in the permanent teeth and 77.3% in the primary teeth. The main radiographic investigation performed was intraoral periapical views (52.9%) following which dental extraction (34.4%) was the main treatment modality offered. CONCLUSION: Prospective cross-sectional studies to determine the prevalence of dental injuries are needed. Furthermore improving the knowledge of dental practitioners through continuing dental education programmes would help in updating them on current trends in managing these injuries.
2007
and Kasina JM(2007, Nderitu JH. "Bees in horticultural crop production; Revisiting the sale of pollination in crop productivity." sustainable agric production in the tropics. 2007.
Muthomi JW;, Otieno PE;, Chemining'wa GN;, Nderitu JH. "Effect of chemical pesticide spray on insect pests and yield of food grain legumes."; 2007.
Nderitu J, Kasina;; M, and NG, Oronje ML. "Effects ofinsecticides applications on sunflower (Helianthus annuus L.) pollination in East Kenya." World J. Agric. Sci. . 2007;6(3):731-734.
Nderitu JH;, Wambua E;, Olubayo F;, Kasina J;, Waturu C. "Evaluation of pesticide/variety combinations for thrips (Thysanoptera: Thripidae) management on French beans (P. vulgaris L.) in Kenya."; 2007. Abstract

A field study was undertaken to evaluate pesticide/variety combinations for thrips infestation and damage in Kabete Field Station, University of Nairobi, Kenya. Four French bean varieties (Amy, Monel, Samantha and Impala) and four insecticides (Lambda-cyhalothrin (Karate 1.75 EC), Petroleum spray oil (DC Tron 500 ML), Spinosad (Tracer 480 SC) and Fipronil (Regent 50 SC)) were used for the study. The study revealed that both the varieties and insecticides influenced thrips infestation independently. Tracer 480 SC and Regent 50 SC gave the lowest thrips numbers in all the varieties. The mean number of F. occidentalis in Karate 1.75 EC sprayed plots was higher and significantly different from plots sprayed with Tracer 480 SC and Regent 50 Sc. The mean number of M. sjostedti was not significantly different for all the plots sprayed with Tracer 480 SC, Regent 50 SC and Karate 1.75 EC. DC Tron 500 ML had no significant effect on thrips infestation.

Nyaga JN;, Muthomi JW;, Olubayo FM;, Nderitu JH. "Seed potato production and occurrence of Transmitted viruses in Nyandarua District."; 2007.
Mwaniki SW;, Nderitu JH;, and Olubayo F, Kimenju JW. "Sweet potato weevil management: an integrated approach based on entomopathogenic nematodes, insecticides and cultural practice. Proceedings of the 1st KARI Mini conference, KARI, Nairo.". In: Proceedings of the 1st KARI Mini conference, KARI, Nairobi, 5-7.; 2007.
Kimenju JW;, Kagundu AM;, Nderitu JH;, Omuolo FM;, Mutua GK. "Use of green manure plants in cropping systems to suppress root-knot nematodes."; 2007. Abstract

Green manure plants namely Calliandra calothyrsus, Canavalia ensiformis, Chenopodium quinoa, Crotalaria juncea, Desmodium uncinartum, Gliricidia sepium, Leucaena leucocephala, Mucuna pruriens, Tephrosia purpurea, Tithonia diversifolia and Vicia villosa were evaluated to determine their reaction to Meloidogyne javanica. Sesbania sesban and Tagetes minuta were included as susceptible and resistant checks respectively. In the glasshouse, pots were filled with steam-sterilized soil, sown with the green manure plant, and then infested with 4,000 eggs and juveniles of M. javanica. Field experiments were conducted in plots infested with a mixed population of M. javanica and M. incognita. Crotalaria juncea, D. uncinartum, G. sepium, L. leucocephala, M. pruriens, T. diversifolia and T. minuta had galling and eggmass indices lower than 2 and reduced nematode populations by up to 80%. Calliandra calothyrsus, C. quinoa and C. ensiformis had galling indices lower than 4 and eggmass indices less than 3.2. Vicia villosa and T. purpurea were susceptible with galling indices greater than 7 and nematode population buildup of up to 500%. Chenopodium quinoa, C. juncea, D. uncinartum, G. sepium, L. leucocephala, M. pruriens and T. diversifolia are suppressive to root-knot nematodes and can therefore be recommended as rotation, fallow or cover crops.

HURIA PROFNDERITUJOHN. "Muthomi, J.W.; Otieno P.E.; Chemining.". In: J. Boil. Sci. 7(7) : 1163 . Nderitu, J, H, and Kasina, J, M.; 2007. Abstract
OBJECTIVE: To determine the pattern of occurrence of dental injuries in the 0-15 year-olds. DESIGN: A retrospective study. SETTING: Kenyatta National Hospital, Nairobi. SUBJECTS: Five hundred and five patient records with dental injuries were retrieved and analysed. RESULTS: A total of 505 patient records with dental injuries were retrieved and analysed. Most of the injuries were recorded in the year 1999 (22.2%). Boys were more affected (63.0%) than girls (37.0%). The main presenting complaint recorded was pain (75.8%).The majority of the patients (69.5%) presented for treatment during the same day or the day after trauma. Falls were the leading cause of injuries (73.5%). Most injuries involved two teeth (47.1%) and the maxillary central incisors were the most affected teeth both in the primary (67.5%) and permanent (64.0%) dentitions. Luxation injuries were the most common type of dental trauma with 47.5% occurring in the permanent teeth and 77.3% in the primary teeth. The main radiographic investigation performed was intraoral periapical views (52.9%) following which dental extraction (34.4%) was the main treatment modality offered. CONCLUSION: Prospective cross-sectional studies to determine the prevalence of dental injuries are needed. Furthermore improving the knowledge of dental practitioners through continuing dental education programmes would help in updating them on current trends in managing these injuries.
2006
Karaya H;, Njoroge K;, Mugo S;, Nderitu H. "Combining Ability among Twenty Insect Resistant Maize inbred lines Resistant to Chilo partellus and Busseola fusca Stem borers."; 2006. Abstract

A partial diallel design was used among 20 maize inbred lines to form 110 F1 hybrids to generate information on the values of these lines for developing insect resistant maize varieties during the short rains season of 2006. The hybrids were evaluated for resistance to the C. partellus and B. fusca, and for agronomic performance over two seasons during long and short rains of 2007 at a mid-altitude dry early maturity site at KARI Kiboko, and the moist mid-altitude medium maturity site at KARI Embu. leaf damage score (using a scale of 1-9 where: 1= No damage and 9= extremely damaged), number of exit holes, cumulative tunnel length, and grain yield were measured as resistance traits. The genotype sum of square was partitioned into general combining ability (GCA) and specific combining ability (SCA) effects. Maize inbred lines with good general combining ability for insect resistance including maize inbred lines with significant and negative GCA`s for leaf damage were identified as lines 12,16,18,19 and 20 at Kiboko and lines 8, 17, 18, and 20 in Embu. Results showed that the problem of stem borers intensified by over 40% within four years in the experimental region of Eastern Kenya; currently mean yield loss due to stem borers was assessed to be about 56%. Several hybrids had significant negative SCA for leaf damage and significant positive SCA for grain yield. The maize inbred lines studied revealed their potential for use in breeding programs for insect resistance that could result in a correlated response for increased grain yield. Recurrent selection would be the best option to develop high yielding insect resistant germplasm for this region of Kenya considering that additive gene action were predominant. Evidently, it would be more difficult to develop host plant resistance to B. fusca than to C. partellus

Kasina, M.J., Nderitu JH;, G. Nyamasyo G;, Olubayo F;, Waturu C. "Evaluation of companion crops for thrips (Thysanoptera: Thripidae) management on French bean, Phaseolus Vulgaris L. (Fabaceae)." International Journal of Tropical Insect Science. 2006;26(2):121.evaluation_of_companion_crops_for_thrips.pdf
2005
Nderitu JH, Namachanja C, Kamau G. "Universities and trade unionsim.". In: DAAD. Nairobi,; 2005.universities_and_trade_unionsim.pdf
Mwaniki SW, Nderitu JH, Olubayo F, Kimenju JW. "Comparative resistance /tolerance of commercial potato cultivars in Kenya to major aphid pests.". In: Africa crop Science Conference .; 2005.
Munyua, W.K., F. M. Olubayo, J.H.Nderitu, S. Shibairo, Obudo E. "Comparative resistance /tolerance of commercial potato cultivars in Kenya to major aphid pests." agric entomology. 2005.
HURIA PROFNDERITUJOHN. "Tende, R. M., J. H. Nderitu, Mugo, S., J. M. Songa, F. O. Olubayo and D. Bergvinson (2005). Screening for development of resistance by the spotted stem borer(Chilo partellus) to Bt maize.". In: African Crop Science Conference Proc. Kampala, 5-9 December 2005. Mwaniki, S. W.; Nderitu, J. H. ; Olubayo, F.; Kimenju, J. W.; 2005. Abstract
OBJECTIVE: To determine the pattern of occurrence of dental injuries in the 0-15 year-olds. DESIGN: A retrospective study. SETTING: Kenyatta National Hospital, Nairobi. SUBJECTS: Five hundred and five patient records with dental injuries were retrieved and analysed. RESULTS: A total of 505 patient records with dental injuries were retrieved and analysed. Most of the injuries were recorded in the year 1999 (22.2%). Boys were more affected (63.0%) than girls (37.0%). The main presenting complaint recorded was pain (75.8%).The majority of the patients (69.5%) presented for treatment during the same day or the day after trauma. Falls were the leading cause of injuries (73.5%). Most injuries involved two teeth (47.1%) and the maxillary central incisors were the most affected teeth both in the primary (67.5%) and permanent (64.0%) dentitions. Luxation injuries were the most common type of dental trauma with 47.5% occurring in the permanent teeth and 77.3% in the primary teeth. The main radiographic investigation performed was intraoral periapical views (52.9%) following which dental extraction (34.4%) was the main treatment modality offered. CONCLUSION: Prospective cross-sectional studies to determine the prevalence of dental injuries are needed. Furthermore improving the knowledge of dental practitioners through continuing dental education programmes would help in updating them on current trends in managing these injuries.
2004
Mwaniki SW;, Nderitu JH;, Olubayo F;, Kimenju JW. " Major insects of crops in Kenya.". In: 9th Triennial Symposium for International Society for Tropical Root and Tuber crops- Africa Branch, 31st October .; 2004.
Mwaniki SW;, Nderitu JH;, Olubayo F, Kimenju JW;. "Effects of Steinernema kari and Heterohabditis indica against the sweet potato weevil (Cylas puncticollis).". In: 9th Triennial Symposium for International Society for Tropical Root and Tuber crops- Africa Branch, 31st October.; 2004.
Kisuthi GG,.;Knapp M;, Shibario JK,; Nderitu JH;, Kiarie N. "Effects if four biopesticides on the spider mite tetranychanus evansi Baker and Pritchard in the laboratory.". In: European Association of Acarologists (EURAAC). Berlin germany; 2004.
Wambua, E. M; Nderitu OWJH; F;. Evaluation of variety resistance as amangement srategy for thrips (megalurothrips sjostedti trybom and frankliniella occidentalis pergrande) on french beans (phaseolus vulgaris l.).; 2004. Abstract

French bean, phaseolllus vulgaris l. is a major horticultural crop in kenya mainly grown for fresh export market. A major contraint in succesfull production of the crop is pests and diseases. thrips are considered as one of the major inscect pests attacking mainly flowers and causing losses of above 60percentage A lot of pesticides use and hence pesticide resideu has been attributed to thrips control. In view of the introduction of maximum pesticides level by importing countries, there is need to develope intergrated thrips mangement strategy with less pesticide use . Towards this goal, nine french beans varieties were evaluated for resistance to thrips (megalurothrips sjostedti frankliniella occidentalis)during the period (november 2001 to april 2002). This was done in two planting phases using randomised complete block design in four replicates. It was evident from the study that there significant diffrences in resistance to thrips by varieties. monel variety was found to be the most susceptibleand impala the least.Frankliniella occidentalis was more abadunt than megalurothrips sjostedti during the study period. The ratio of M . sjostedti to F. occidentalis on flowers was 1.5and 1.7 during the 1st and 2nd planting respectively.

Nderitu JH;, Kasina J. "Major Insects Of Crops In Kenya."; 2004.
2003
Sila MM, Nyamasyo GHN, Nderitu JH. "Effect of Steinernema kari and Heterobabditis indica against sweet potato weevil.". In: African Crop Science Society.; 2003.
Sila, M. M. N, N. GH, Nderitu JH. "Effect of Steinernema kari and Heterobabditis indica against sweet potato weevil (Cylas punticollis )." agric entomology. 2003;2(5):23-25.

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