Publications

Found 38 results

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2018
Nyankanga RO, W.W. Murigi, undefined. "Effect of packaging material on shelf life and quality of ware potato tubers stored at ambient tropical temperatures." Potato Research . 2018;11540-018-9377-0(10.1007):11540-018-9377-0.Effect of packaging material on shelf life and quality of ware potato tubers stored at ambient tropical temperaturespdf
R.O N, Murigi WW, S. I. Shibairo, and O. M. Olanya, Larkin RP. "Effects of foliar and tuber sprout suppressants on storage of ware potatoes under tropical ambient conditions." . American Journal of Potato Research . 2018.effects_of_foliar_and_tuber_sprout_suppressants_on_storage_of_ware_potatoes_under_tropical_ambient_conditions.pdf
Nyankanga R, Murigi WW, Shibairo SI. "Effects of foliar and tuber sprout suppressants on storage of ware potatoes under tropical ambient conditions. American Journal of Potato Research ." Potato Research . 2018.Effects of foliar and tuber sprout suppressants on storage of ware potatoes under tropical ambient conditions.pdf
Gateri M.W., R. Nyankanga, Ambuko J, Muriuki AW. "Growth, Yield and Quality of Onion (Allium cepa L.) as Influenced by Nitrogen and Time of Topdressing. ." International Journal of Plant & Soil Science . 2018;23(32)( DOI: 10.9734/IJPSS/2018/42135):1-13.Growth, Yield and Quality of Onion (Allium cepa L.) as Influenced by Nitrogen and Time of Topdressing. .pdf
2017
Mageto E.K, D. Makumbi, and K. Njoroge, Nyankanga R. ". Genetic analysis of early-maturing maize (Zea Mays L.) inbred lines under stress and nonstress conditions." Journal of Crop Improvement. 2017; DOI: 10.1080/15427528.2017.(, 31:4, ).Genetic_analysis_of_early_maturing_maize_zea_mays_l_inbred_lines_under_stress_and_nonstress_conditions.pdf
Odanga J., S. Mohamed, F.Olubayo, R. Nyankanga, S. Mwalusepo, S.Subramanian, and T. Johansson, Ekesi. S. "Datasets on abundance of common blossom thrips and weather variables in small-scale Avocado orchards at Taita Hills and Mount Kilimanjaro." Insects. 2017;( doi:10.3390/):9, 71.Spatial Distribution of Bactrocera dorsalis and Thaumatotibia leucotreta in Smallholder Avocado Orchards along Altitudinal Gradient of Taita Hills and Mount Kilimanjaro.pdf
Mageto E.K, D. Makumbi, and K. Njoroge, Nyankanga R. "Genetic analysis of early-maturing maize (Zea Mays L.) inbred lines under stress and nonstress conditions." Journal of Crop Improvement. 2017; DOI: 10.1080/15427528.2017.1315625(31:4, ):560-588.
Odanga J. J, F.Olubayo, R. Nyankanga, S. Mwalusepo, Johansson T. "Records of arthropod species sampled from Avocado plant (Persea americana Mill) in Small scale Agro-ecosystems at Taita Hills and Mount Kilimanjaro." International Journal of Environment, Agriculture and Biotechnology . 2017;12(5):2457-2465.Records of arthropod species sampled from Avocado plant (Persea americana Mill) in Small scale Agro-ecosystems at Taita Hills and Mount Kilimanjaro.
J. OJ, S. Mohamed, F.Olubayo, R. Nyankanga, I. A. Otieno, S. Mwalusepo, and G. Mwachala, Johansson T. "Spatial characterization of common blossom thrips (Frankliniella schultzei) in smallholder avocado orchards along slopes of Taita Hills and Mount Kilimanjaro." International Journal of Environment, Agriculture and Biotechnology . 2017;12(5):2457-2465.Spatial characterization of common blossom thrips (Frankliniella schultzei) in smallholder avocado orchards along slopes of Taita Hills and Mount Kilimanjaro
2016
Ojwang J. D, R.O. Nyankanga, and J. Imungi, Olanya MO. ". Growth Parameters of vegetable pigeon pea varieties in Kenya." Horttechnology spotlight 5. 2016.nyankangaojwanghortechnology_spotlight_vol_97_pg_5_2016pdf.pdf
12. Ojwang J.D., R O.Nyankanga, J. Imungi, and M. Olanya, Ukuku D. "Cultivar preference and sensory evaluation of vegetable pigeon pea (Cajanus cajan) in Eastern Kenya." Food Security . 2016;8:757–767. DOI 10.1007/s12571-016-0592-8(8):757-767.. Cultivar preference and sensory evaluation of vegetable pigeon pea (Cajanus cajan) in Eastern Kenya.pdf
D. OJ,, J.N Kiiru, O.M. Olanya, and D.O. Ukuku, Imungi J, Nyankanga RO. "Plant characteristics and growth parameters of vegetable pigeon pea cultivars." Subtropical Agriculture and Environments. 2016;( 67:):1-12.Plant characteristics and growth parameters of vegetable pigeon pea cultivars.pdf
Ojwang J. D., R.O. Nyankanga, O.M. Olanya, and D.O. Ukuku, Imungi J. "Yield components of vegetable pigeon pea cultivars." Subtropical Agriculture and Environments. 2016;( 67:):1-12.Yield components of vegetable pigeon pea cultivars
2015
Nyankanga R, Njogu M, Muthomi J, Olanya M. "Efficacy of fungicide combinations, phosphoric acid and plant extract from stinging nettle on potato late blight management and tuber yield." Archives of Phytopathology and Plant Protection . 2015;5(12):1449-1463 .efficacy_of_fungicide_combinations_phosphoric_acid_and_plant_extract_from_stinging_nettle_on_potato_late_blight_management_and......
P.D M, Gathungu GK, Njogu MK, Nyankanga RO, Ambuko J, Landeo JA. "Optimization of seed potato (Solanum tuberosum L.) tuber dormancy and sprouting capacity through integrated gibberellic acid and benzylaminopurine application." Journal of Agriculture and Ecology Research International . 2015;4(4):188-198.
2014
Nyankanga R, W. Kiplagat, R. Narla1, S. Shibairo, J. Kabira, J. Landeo and M. "Effects of early and late harvest on agronomic performance and stability of late Blight resistant (R-gene Free) potato genotypes." J. Crop Sci. Biotech. . 2014;17(2): 89~96.effects_of_early_and_late_harvest_on_agronomic_performance_stability_and_late_blight_resistant_r-gene_free_potato_genotypes.pdf
Njogu M, Muindi E, Muthomi J, Nyankanga R, Muchiri P. "Phytophthora infestans responses to stinging nettle extract, phosphoric acid and fungicides combination, in Kenya." Direct Research Journal of Agriculture and Food Science . 2014;2(9):128-134, .phytophthora_infestans_responses_to_stinging_nettle.pdf
2012
R 18. A, Mugisha J, Kwikiriza N, Nakimbugwe D, Masinde D, Nyankanga RO. ". Economic Evaluation of Grain Amaranth Production in Kamuli District, Uganda.". 2012.economic_evaluation_of_grain_amaranth_production_in_kamuli_district_uganda.pdf
Nyankanga RO, Onwonga RN, Wekesa FS, Nakimbugwe D, Masinde D, Mugisha J. "Effect of Inorganic and Organic Fertilizers on the Performance and Profitability of Grain Amaranth (Amaranthus caudatus L.) in Western Kenya. Journal of Agricultural Science." Journal of Agricultural Science. 2012;4(1):223-232.
and. Nyankanga, R. NMOMJM. "Efficacy of fungicide combinations, phosphoric acid and plant extract from stinging nettle on potato late blight management and tuber yield.". 2012;45 (12:1449-1463 .abstract_1.pdf
. Modesto Olanya, Richard Nyankanga POBLRKDF. "Optimization of Late Blight and Bacterial Wilt Management in Potato Production Systems in the Highland Tropics of Africa. In Sustainable Potato Production: Global Case Studies.". 2012:509-531 .abstract_2.pdf
2011
Nyankanga, R.O. OOWHKOMPS. "Validation of a tuber blight (Phytophthora infestans) prediction model. Crop Protection Journal.". 2011;30:547-553.abstract_4.pdf
2009
and Muchiri, F.N. NONARDOM. "Efficacy of fungicide mixtures for management of Phytophthora infestans (US-1) on potato. Phytoprotection.". 2009;90:19-29.abstract_5.pdf
and 1. Olanya O.M., P.S. Ojiambo NHKROCW. "Recent developments in managing tuber blight of potato (Solanum tuberosum) caused by Phytophthora infestans. Canadian Journal of Plant Pathology." Canadian Journal of Plant Pathology . 2009;31:280-289.recent_developments_in_managing_tuber_blight_of_potato_solanum_tuberosum.pdf
2008
Nyankanga RO. "Development of Tuber Blight.". 2008;(5)(43):1501-1508.abstract_2.pdf
Nyankanga R. O., H. C. Wien OOM. "Effects of Mulch and Potato Hilling on Development of Foliar Blight (Phytophthora infestans) and the Control of Tuber Blight Infection. Potato Research.". 2008;51:101-111.
Menza M.K, S. I. Shibairo, R.O. Nyankanga, P. Demo, J.N. Kabira, Gildemacher P. "Effects of pit, dark and cold pre-storage treatments and their duration on dormancy breaking and sprouting of seed potato tubers (Solanum tuberosum L.).". 2008.effects_of_pit_dark_and_cold_pre-storage_treatments_and_their_duration_on_dormancy_breaking_and_sprouting_abstract.pdf
Nyankanga RO, Wein HC, Olanya OM. "Relationship Between Incidence of Late Blight Tuber Rot, Foliage Blight Control and the Effect of Weather and Soil Variables.". 2008. Abstract

The relationship of late blight disease, tuber blight and the effects of weather and soil variables were determined at 2 distinct environments of New York and Kenya during 1999 to 2001. In well replicated field experiments at the two sites where A2 (US8 clone) and A1 (US1 clone) respectively are dominant, foliar and tuber blight development, climatic and soil variables were quantified during three cropping seasons. Variation in tuber blight in New York and Kenya was detected. Stepwise multiple regression and correlation analysis identified combinations of variables associated with tuber blight such as cultivar characteristics, soil temperature and precipitation events. The research results can provide insight into the dynamics of tuber blight infection processes and be useful for tuber blight management strategies.

2007
Nyankanga RO, Wien HC, Olanya MO, Ojiambo PS. "Relationship between late blight (Phytophtora infestans) of potato on tuber and foliage, as affected by the disease severity on foliage, cultivar resistance and atmospheric and soil variables. Canadian Journal of Plant Pathology.". 2007;29:372-387.
Nyankanga RO, Wien HC, Olanya OM, Ojiambo PS. "Relationship of foliar and potato tuber blight (Phytophthora infestans) as affected by foliage blight severity, cultivar resistance, atmospheric and soil variables.". 2007.
Nyankanga RO, Olanya OM, Wein HC. "Schematic Models for Potato Tuber Blight Infection Based on Foliar Blight Severity, Cultivar Resistance, Soil and Atmospheric Variables.". 2007.
Kikuvi GM, Schwarz S, Mitema ES, Kehrenberg C. "Streptomycin and chloramphenicol resistance genes in Escherichia coli isolates from cattle, pigs, and chicken in Kenya.". 2007. AbstractWebsite

The aims of this study were to determine the genetic basis of streptomycin and chloramphenicol resistance in 30 Escherichia coli isolates from food animals in Kenya and the role of plasmids in the spread of the resistance. Seven of the 29 streptomycin-resistant isolates harbored both the strA and strB genes. Twenty-one of isolates had the strA, strB, and aadA1 genes. The strA gene was disrupted by a functional trimethoprim gene, dfrA14 in 10 of the 21 isolates harboring the three streptomycin resistance genes. Physical linkage of intact strA and sul2 genes was found in two different plasmids from four isolates. Linkage of cassette-borne aadA1 and dfrA1 genes in class 1 integrons was found in two of the isolates. Chloramphenicol resistance was due to the gene catA1 in all the chloramphenicol resistant isolates. The strB, strA, and catA1 genes were transferable by conjugation and this points to the significance of conjugative resistance plasmids in the spread and persistence of streptomycin and chloramphenicol resistance in food animals in Kenya.

2006
and Olanya, O.M. ONPSRO. "Dynamics of development of late blight [Phytophthora infestans] in potato, and comparative resistance of cultivars in the highland tropics. Canadian Journal of Plant Pathology, .". 2006;28:84-94.abstract_9.pdf
and 6. S.I. Shibairo, P. Demo KGGMNC’wa NJNPE. "The effects of gibberellic acid (GA3) on sprouting and quality of potato seed tubers in diffused light and pit storage conditions. Journal of Biological Sciences.". 2006;6(4):723-733.abstract_8.pdf
Nyankanga R. "Effects of Gibbereric Acid (GA3) on sprouting and Quantity potato seed Tubers in Difuse light and pit storage Conditions." Biological Science. 2006;6(4):723-733.abstract.pdf
2004
and Nyankanga, R.O. WOOHCMOP. "Farmers’ cultural practices and management of potato late blight in Kenya highlands: Implications for development of integrated disease management. International Journal of Pest Management.". 2004;50(2) :135-144.abstract_10.pdf
2002
Wien, H.C., S.C. Stapleton, D.N. Maynard, C. McClurg, and R.O. Nyankanga, Riggs D. "Regulation of female flower development in pumpkin (Cucurbita spp) by temperature and light.". 2002.
1996
H.C. Wien, undefined, Nyankanga R. ". Low light stress influences lower abscission and yield of bell pepper cultivars." HortScience. 1996;31(4).

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