Bio

Publications


2016

Ndlela, S, Mohamed S, Ndegwa PN, Ong’amo GO, Ekesi S.  2016.  Male annihilation technique using methyl eugenol for field suppression of Bactrocera dorsalis (Hendel) (Diptera: Tephritidae) on mango in Kenya. African Entomology . 24(2):437–447.
Wanjama, JK, Onyango I, Mutyambai DM, Kabochi SK, Ndegwa PN.  2016.  Occurrence of Nosema species in honey bee colonies in Kenya. Bulletin of Animal and Health Production in Africa. :129–135.
Karuri, HW, Olago D, Neilson R, Njeri E, Opere A, Ndegwa P.  2016.  Plant parasitic nematode assemblages associated with sweet potato in Kenya and their relationship with environmental variables. Tropical Plant Pathology. DOI 10.1007/s40858-016-0114-4

2015

2013

Mugo, HM, Irungu LW, Ndegwa LW.  2013.  Population of predacious phytoseiid mites, Euseius kenyae (Swirski and Ragusa) on coffee treated with different soil applied fertilizers. African Journal of Agricultural Research. 8(37):4608-4613.Website

2012

Fombong, AT, Teal PEA, Arbogast RT, Ndegwa PN, Irungu LW, Torto B.  2012.  Chemical communication in the honey bee scarab pest Oplostomus harlodi: Role of (Z)-9- Pentacosene. Journal of Chemical Ecology. 38:1463-1473.Website
H. M. Mugo, L. W. Irungu, P. N. Ndegwa.  2012.  Population dynamics of predacious phytoseiid mites, Euseius kenyae and coffee thrips, Diarthrothrips coffeae and their Interactions in coffee agro ecosystems in Kenya. International Journal of Science and Nature. 3(3):12-16.: International Journal of Science and Nature AbstractWebsite

ABSTRACT: Several strategies are employed in management of insect pests. Among these, chemical control is a priority to most farming communities where pest incidences occur while other existing options such as biological control are rarely considered. In coffee farming agro ecosystems, there are indigenous biological control agents such as the predacious phytoseiid mites, Euseius kenyae (Swirski and Ragusa) that have the potential to manage secondary pests like coffee thrips, Diarthrothrips coffeae Williams. This study was conducted to assess the population dynamics of E. kenyae and D. coffeae as well as theirinteractions under coffee agro ecosystems where various soil fertilizer sources and selective insecticides were applied as treatments. The populations of both E. kenyae and D. coffeae fluctuated during the three years study period. The E. kenyae suppressed the population of D. coffeae under various treated coffee blocks. There was negative correlation between E. kenyae and D. coffeae in year 2006 and 2008 where the increasing population of E. kenyae decreased that of D. coffeae. In year 2007, positive correlation between E. kenyae and D. coffeae was observed in some of the treatments where increased population of D. coffeae caused an increased population of E. kenyae. Euseius kenyae managed to contain the D. coffeae population to below economical injury levels (1-2 thrips per leaf) during the three years under the various coffee agro ecosystems. The use of chlorpyrifos never affected E. kenyae. Their survival and increased in number under chlorpyrifos treated coffee blocks indicated the development of resistance by the population of E. kenyae, hence the possibility of using them as a component in an Integrated Pest Management strategy in coffee.

Fombong, AT, Haas F, Ndegwa PN, Irungu LW.  2012.  Life history of Oplostomus haroldi (Coleoptera: Scarabaeidae) under laboratory conditions and a description of its third instar larva. International Journal of Tropical Insect Science. 32(1):1-8.: International Journal of Tropical Insect ScienceWebsite

2011

Maribie, CW, Nyamasyo GHN, Ndegwa PN, Lagerl, F J, Gikungu M.  2011.  8. Maribie, C.W.; Nyamasyo, G.H.N.; Ndegwa, P.N.; Lagerl, F, J.; Gikungu, M. (2011). Abundance and diversity of soil mites (acari) along a gradient of land use types in Taita Taveta, Kenya.. Tropical and subtropical agroecosystems. 13(1):11-26.
H. M. Mugo, E. M. El-Banhawy, L. W. Irungu, P. N. Ndegwa.  2011.  The insect pests of coffee and their distribution in Kenya. InternationalJournal of Science and Nature. 2(3), 564-569. International journal of Science and Nature. 2(3):564-569.: InternationalJournal of Science and Nature AbstractWebsite

ABSTRACT: Several strategies are employed in management of insect pests. Among these, chemical control is a priority to most farming communities where pest incidences occur while other existing options such as biological control are rarely considered. In coffee farming agro ecosystems, there are indigenous biological control agents such as the predacious phytoseiid mites, Euseius kenyae (Swirski and Ragusa) that have the potential to manage secondary pests like coffee thrips, Diarthrothrips coffeae Williams. This study was conducted to assess the population dynamics of E. kenyae and D. coffeae as well as theirinteractions under coffee agro ecosystems where various soil fertilizer sources and selective insecticides were applied as treatments. The populations of both E. kenyae and D. coffeae fluctuated during the three years study period. The E. kenyae suppressed the population of D. coffeae under various treated coffee blocks. There was negative correlation between E. kenyae and D. coffeae in year 2006 and 2008 where the increasing population of E. kenyae decreased that of D. coffeae. In year 2007, positive correlation between E. kenyae and D. coffeae was observed in some of the treatments where increased population of D. coffeae caused an increased population of E. kenyae. Euseius kenyae managed to contain the D. coffeae population to below economical injury levels (1-2 thrips per leaf) during the three years under the various coffee agro ecosystems. The use of chlorpyrifos never affected E. kenyae. Their survival and increased in number under chlorpyrifos treated coffee blocks indicated the development of resistance by the population of E. kenyae, hence the possibility of using them as a component in an Integrated Pest Management strategy in coffee.

H. M. Mugo, E. M. El-Banhawy, L. W. Irungu, P. N. Ndegwa, D.M. Mburu.  2011.  Resistance of Predacious mites, Euseius kenyae (Acari: Phytoseiidae) to chlorpyrifos (Dursdan. Journal of Agricultural Science and Technology. 13(1):53-64.: Journal of Agricultural Science and Technology AbstractWebsite

ABSTRACT: Several strategies are employed in management of insect pests. Among these, chemical control is a priority to most farming communities where pest incidences occur while other existing options such as biological control are rarely considered. In coffee farming agro ecosystems, there are indigenous biological control agents such as the predacious phytoseiid mites, Euseius kenyae (Swirski and Ragusa) that have the potential to manage secondary pests like coffee thrips, Diarthrothrips coffeae Williams. This study was conducted to assess the population dynamics of E. kenyae and D. coffeae as well as theirinteractions under coffee agro ecosystems where various soil fertilizer sources and selective insecticides were applied as treatments. The populations of both E. kenyae and D. coffeae fluctuated during the three years study period. The E. kenyae suppressed the population of D. coffeae under various treated coffee blocks. There was negative correlation between E. kenyae and D. coffeae in year 2006 and 2008 where the increasing population of E. kenyae decreased that of D. coffeae. In year 2007, positive correlation between E. kenyae and D. coffeae was observed in some of the treatments where increased population of D. coffeae caused an increased population of E. kenyae. Euseius kenyae managed to contain the D. coffeae population to below economical injury levels (1-2 thrips per leaf) during the three years under the various coffee agro ecosystems. The use of chlorpyrifos never affected E. kenyae. Their survival and increased in number under chlorpyrifos treated coffee blocks indicated the development of resistance by the population of E. kenyae, hence the possibility of using them as a component in an Integrated Pest Management strategy in coffee.

P.M. Ngumbi, L. W. Irungu, P. N. Ndegwa, N.K. Maniania.  2011.  Pathogenicity of Metarhizium anisopliae (Metch) Sorok and Beauveria bassiana (Bals) Vuill to adult Phlebotomus duboscqi (Neveu-Lemaire) in the laboratory. International Journal of Science and Nature. 48:37-40.: International Journal of Science and Nature AbstractWebsite

ABSTRACT: Several strategies are employed in management of insect pests. Among these, chemical control is a priority to most farming communities where pest incidences occur while other existing options such as biological control are rarely considered. In coffee farming agro ecosystems, there are indigenous biological control agents such as the predacious phytoseiid mites, Euseius kenyae (Swirski and Ragusa) that have the potential to manage secondary pests like coffee thrips, Diarthrothrips coffeae Williams. This study was conducted to assess the population dynamics of E. kenyae and D. coffeae as well as theirinteractions under coffee agro ecosystems where various soil fertilizer sources and selective insecticides were applied as treatments. The populations of both E. kenyae and D. coffeae fluctuated during the three years study period. The E. kenyae suppressed the population of D. coffeae under various treated coffee blocks. There was negative correlation between E. kenyae and D. coffeae in year 2006 and 2008 where the increasing population of E. kenyae decreased that of D. coffeae. In year 2007, positive correlation between E. kenyae and D. coffeae was observed in some of the treatments where increased population of D. coffeae caused an increased population of E. kenyae. Euseius kenyae managed to contain the D. coffeae population to below economical injury levels (1-2 thrips per leaf) during the three years under the various coffee agro ecosystems. The use of chlorpyrifos never affected E. kenyae. Their survival and increased in number under chlorpyrifos treated coffee blocks indicated the development of resistance by the population of E. kenyae, hence the possibility of using them as a component in an Integrated Pest Management strategy in coffee.

2008

F.N. Namu, J.M. Githaiga, E..N.Kioko, P. N. Ndegwa, C.L. Häuser.  2008.  Butterfly species composition and abundance in an old, middle-aged, and young secondary forests. In: Kühne L. (Ed.), Butterflies and moths diversity of the Kakamega forest (Kenya), pp. 47-61. , Brandenburg, Germany: Brandenburgische Universitätsdruckerei und Verlagsgesellschaft Abstract

ABSTRACT: Several strategies are employed in management of insect pests. Among these, chemical control is a priority to most farming communities where pest incidences occur while other existing options such as biological control are rarely considered. In coffee farming agro ecosystems, there are indigenous biological control agents such as the predacious phytoseiid mites, Euseius kenyae (Swirski and Ragusa) that have the potential to manage secondary pests like coffee thrips, Diarthrothrips coffeae Williams. This study was conducted to assess the population dynamics of E. kenyae and D. coffeae as well as theirinteractions under coffee agro ecosystems where various soil fertilizer sources and selective insecticides were applied as treatments. The populations of both E. kenyae and D. coffeae fluctuated during the three years study period. The E. kenyae suppressed the population of D. coffeae under various treated coffee blocks. There was negative correlation between E. kenyae and D. coffeae in year 2006 and 2008 where the increasing population of E. kenyae decreased that of D. coffeae. In year 2007, positive correlation between E. kenyae and D. coffeae was observed in some of the treatments where increased population of D. coffeae caused an increased population of E. kenyae. Euseius kenyae managed to contain the D. coffeae population to below economical injury levels (1-2 thrips per leaf) during the three years under the various coffee agro ecosystems. The use of chlorpyrifos never affected E. kenyae. Their survival and increased in number under chlorpyrifos treated coffee blocks indicated the development of resistance by the population of E. kenyae, hence the possibility of using them as a component in an Integrated Pest Management strategy in coffee.

F.N. Namu, J.M. Githaiga, E.N. Kioko, Ndegwa PN, C.L. Häuser, L.Kühn.  2008.  The butterfly, Hypolimnas salmacis magnifica (Drury, 1773) in Kakamega Forest National Reserve (KFNR) Kenya. Metamorphosis. 18(4):142-143.: InternationalJournal of Science and Nature AbstractWebsite

ABSTRACT: Several strategies are employed in management of insect pests. Among these, chemical control is a priority to most farming communities where pest incidences occur while other existing options such as biological control are rarely considered. In coffee farming agro ecosystems, there are indigenous biological control agents such as the predacious phytoseiid mites, Euseius kenyae (Swirski and Ragusa) that have the potential to manage secondary pests like coffee thrips, Diarthrothrips coffeae Williams. This study was conducted to assess the population dynamics of E. kenyae and D. coffeae as well as theirinteractions under coffee agro ecosystems where various soil fertilizer sources and selective insecticides were applied as treatments. The populations of both E. kenyae and D. coffeae fluctuated during the three years study period. The E. kenyae suppressed the population of D. coffeae under various treated coffee blocks. There was negative correlation between E. kenyae and D. coffeae in year 2006 and 2008 where the increasing population of E. kenyae decreased that of D. coffeae. In year 2007, positive correlation between E. kenyae and D. coffeae was observed in some of the treatments where increased population of D. coffeae caused an increased population of E. kenyae. Euseius kenyae managed to contain the D. coffeae population to below economical injury levels (1-2 thrips per leaf) during the three years under the various coffee agro ecosystems. The use of chlorpyrifos never affected E. kenyae. Their survival and increased in number under chlorpyrifos treated coffee blocks indicated the development of resistance by the population of E. kenyae, hence the possibility of using them as a component in an Integrated Pest Management strategy in coffee.

2007

S. Mihok, D.A. Carlson, P. N. Ndegwa.  2007.  Tsetse and other biting fly responses to nzi traps baited with octenol, phenols and acetone. Medical and Veterinary Entomology. 21:70-84.: The Royal Entomological SocietyWebsite

2005

E.M. Mathenge, G.O. Misian, D.O. Oulo, L. W. Irungu, P. N. Ndegwa, G.F. Killeen, B.G.J. Knols.  2005.  Comparative performance of Mbita trap, CDC light trap and Human Landing Catch in the sampling of Anopheles arabiensis, An. Funestus and culicine speci. Malaria Journal. 4:7-11.: The Royal Entomological SocietyWebsite

2004

Mathenge, EM, Omweri GO, Irungu LW, Ndegwa PN, Welczak E, undefined, Kileen GF, Knols BJG.  2004.  Comparative field evaluation of Mbita trap, CDC light trap and the Human Landing Catch for sampling of malaria vectors. American Journal of Tropical Medicine & Hygiene . 70:33-37.: The Royal Entomological SocietyWebsite

2003

Ndegwa, PN.  2003.  Lecture Notes on Invertebrate Zoology. American Journal of Tropical Medicine & Hygiene 70, 33-37. , Nairobi: University of NairobiWebsite

2002

Mathenge, EM, Killen GF, Oulo DO, Irungu LW, Ndegwa PN, Knols BJG.  2002.  Development of an exposure-free bednet trap for sampling Afrotropical malaria vectors. Medical & Veterinary Entomology 16, 1-8. 16:1-8.: The Royal Entomological SocietyWebsite
Ndegwa, PN, Ogodo J.  2002.  Community structure and diel activity patterns of peridomestic Stomoxyinae in Nairobi, Kenya . Insect Science & it’s Application. 22:275-280.: The Royal Entomological SocietyWebsite

2001

Ndegwa, PN, Mihok S, Oyieke FA.  2001.  Habitat Preference and Activity Patterns of Glossina swynnertoni Austen (Diptera: Glossinidae) in Aitong, Masai Mara, Kenya. Insect Science & it’s Application. 21(2):113-122.

1999

Ndegwa, PN, Mihok S.  1999.  Development of odour-baited traps for Glossina swynnertoni Austen. Bulletin of Entomological Research. 89:255-261.: CABI PublishingWebsite

1997

Ndegwa, PN.  1997.  Studies on ecology and epidemiological significance of Glossina swynnertoni Austen in Masai Mara, Kenya. Bulletin of Entomological Research 98, 255-261.. (Steve Mihok, Florence Oyieke, Eds.)., Nairobi: University of Nairobi

1994

Mihok, S, Munyoki EN, Masaninga F, Ndegwa PN, Olubayo RO.  1994.  Isolation of Trypanosoma ssp. from wild flies through procyclic expansion in Glossina morsitans centralis. Acta Tropica 56, 25-37. 56:25-37.: Elsevier Science B.V.Website

1992

1991

Ndegwa, PN.  1991.  Cyclic development of Trypanosoma congolense Broden in Glossina morsitans centralis, G. brevipalpis and G. swynnertoni. M.Sc. Thesis, University of Nairobi., 1991. University of Nairobi. (Moloo S.K., Irungu L.W., Eds.)., Nairobi: University of Nairobi

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