Dr Ruth Kahuthia

Title: Dr.
Position: Senior Lecturer 
Department:
Agricultural Science and Technology
Area of Specialization:
Agriculture Entomology
Contact Address: P.O. Box 43844 Nairobi 00100

Google Scholar
ORCID ID


View full CV pdf

 Research Interests 

 Use of natural enemy’s in the management of arthropod pests. With a bias on Integrated Pest Management (IPM) strategies of the horticultural crops. Research in areas related in conservation of the natural enemies in order to reduce on pesticides.  Sustain biodiversity.

 Publications

Referred Journals

  • Sammy Kiprotich Cheruiyot, Ruth Kahuthia-Gathu, Jenard Patrick Mbugi, Elliud Muli, H Michael G Lattorff. (2020). Population abundance of Varroa destructor and its effects on Apis mellifera scutellata colonies in Kenya, Experimental and Applied Acarology, 82(2): 71-184.
  • Ofgaa Djirata, Emana Getu and Ruth Kahuthia-Gathu. (2019). A survey of geographical distribution and host range of white mango scale, Aulacaspis tubercularis Newstead (Hemiptera: Diaspididae) in Western Ethiopia Journal of entomology and nematology, Vol 11 (5):59-65.
  • Kahuthia-Gathu, R. and Othim, S. T. O. (2019). Effects of two cultivated Brassica sp. on the development and performance of Diadegma semiclausum (Hymenoptera: Ichneumonidae) and Cotesia vestalis (Hymenoptera: Braconidae) parasitizing Plutella xylostella (Lepidoptera: Plutellidae) in Kenya. Journal of Economic Entomology. 112, 2094-2102.
  • Joseph Mutunga Mulwa, Ruth Kahuthia Gathu, Nyamai Matolo, Mary Mwari Guantai and John Muo Kasina (2019). Avocado (Persea americana) floral calendar and diurnal visitation rates of its pollinators in Murang’a, Kenya. Journal of Agricultural Research Advances. Vol 01 (1): 23-27.
  • M. W. Barasa, R. Kahuthia-Gathu, M. Mwangi and J. W. Waceke (2019). Tomato Production Characteristics, Biotic Constraints and theirManagement Practices by Farmers in Bungoma County, Kenya. Journal of Natural Sciences Research. Vol.9, No.12, DOI: 10.7176/JNSR
  • Othim, S.T.O., R. Srinivasan, R. Kahuthia-Gathu, T. Dubois, S. Ekesi, K.K.M. Fiaboe. (2019). Effect of host age and density on the performance of Apanteles hemara (Hymenoptera: Braconidae), a larval endoparasitoid of Spoladea recurvalis (Lepidoptera: Crambidae). Journal of Economic Entomology. 1-11  DOI:10.1093/jee/toz165.
  • Kahuthia R., Abonyo A. and Imbayi B. (2019). Composition and diversity of xylophagous and predatory beetles in Vachellia xanthophloea (Benth.) P.J.H.Hurter (Fabales: Fabaceae) at Kenyatta University and Mitaboni, Kenya, Journal of Asia-Pacific Biodiversity, xx (xx) x-x. https://doi.org/10.1016/j.japb.2019.03.006  .
  • Stephen T. O. Othim, Srinivasan Ramasamy, Ruth Kahuthia-Gathu, Thomas Dubois, Sunday Ekesi, and Komi K. M. Fiaboe. (2018). The Effects of Pest-Resistant Amaranth Accessions on the Performance of the Solitary Endoparasitoid Apanteles hemara (Hymenoptera: Braconidae) Against the Amaranth Leaf-Webber Spoladea recurvalis (Lepidoptera:Crambidae). Environmental Entomology, 48(1), 163–172. https://doi.org/10.1093/eenvy183
  • Stephen T. O. Othim, Srinivasan Ramasamy, Ruth Kahuthia-Gathu, Thomas Dubois, Sunday Ekesi, and Komi K. M. Fiaboe. Screening for resistance against major lepidopteran and stem weevil pests of amaranth in Tanzania. Euphytica (2018) 214:182 https://doi.org/10.1007/s10681-018-2269-1
  • Stephen, T.O. Othim, Srinivasan Ramasamy, Ruth Kahuthia-Gathu, Thomas Dubois, Sunday Ekesi and Komi K.M.Fiaboe (2018). Expression of Resistance in Amaranthus spp. (Caryophyllales: Amaranthaceae): Effects of Selected Accessions on the Behaviour and Biology of the Amaranth Leaf-Webber, Spoladea recurvalis (Lepidoptera: Crambidae). Insects 2018, 9(2), 62; https://doi.org/10.3390/insects9020062
  • Kahuthia-Gathu, R., Kirubi, DT. and Gitonga D. (2018). Composition and abundance of wood-boring beetles of Acacia xanthophloea and their associated natural enemies in Thika, Kenya. Journal of Asia-Pacific Biodiversity, 11: 248-254. https://doi.org/10.1016/j.japb.2018.03.003.
  • Othim, S.T.O., Kahuthia-Gathu, R., Akutse, K.S., Foba, C.N. and Fiaboe, K.K.M. (2018). Seasonal occurrence of amaranth Lepidopteran defoliators and effect of attractants and amaranth lines in their management. Journal of Applied Entomology: 00:1–9. https://doi.org/10.1111/jen.12513
  • Kahuthia-Gathu, R., Kirubi, D. T., Wangu, L. and Kimani, R. (2018).  Bostrichidae Beetles associated with Acacia xanthoploea in Nairobi and Machakos Counties, Kenya.  PloS ONE 13(3): e0188773. https://doi.org/10.1371/journal.pone.0188773
  • Kahuthia-Gathu, R., Kirubi, D. T. and Nangalama D. (2018). Abundance and Distribution of Heterostigmatic Mites Tarsonemus Sp., on Wood-Boring Beetles Recovered from Acacia Xanthophloea in Kenya. Journal of Biodiversity Management & Forestry. 7.1. DOI: 10.4172/2327-4417.1000192
  • Sammy Kiprotich Cheruiyot, H. Michael G. Lattorff, Ruth Kahuthia-Gathu, Jenard Patrick Mbugi, and Elliud Muli (2018). Varroa- specific hygienic behavior of Apis mellifera scutellata in Kenya. Apidologie: 49:439-449.     DOI: 10.1007/s13592-018-0570-6
  • S. T. O. Othim, K. M. Agbodzavu, R. Kahuthia-Gathu, K. S. Akutse, S. Muchemi, S. Ekesi, and K. K. M. Fiaboe (2017). Performance of Apanteles hemara (Hymenoptera: Braconidae) on two Amaranth Leaf-webbers: Spoladea recurvalis and Udea ferrugalis (Lepidoptera: Crambidae). Environmental Entomology, 46(6), 2017, 1284–1291.
  • Kahuthia-Gathu R. Maina Mwangi and Fiaboe M.O. (2017). Assessing and Enhancing Impact of Cotesia vestalis in the Management of Diamondback Moth Plutella xylostella on Kales in Semi-Arid Areas of Kenya. Journal of Environmental and Agricultural Sciences. Vol 11:1-13.
  • Ofgaa Djirata, Emana Getu and Ruth Kahuthia-Gathu. (2017). Association of a native predator Chilocorus sp. (Coleoptera: Coccinelidae) with a new exotic mango pest, Aulacaspis tubercularis Newstead (Hemiptera: Diaspididae) in Ethiopia. Israel Journal of Entomology, Vol. 47, pp. 1–8
  • Kahuthia-Gathu, R., Nyambo, B. and Subramanian, S. (2017). Impact of introduced parasitoid Cotesia vestalis (Hymenoptera: Braconidae) on Plutella xylostella (Lepidoptera: Plutellidae) and its parasitoid guild on kale in semi-arid areas in Kenya. International Journal of Tropical Insect Science, 1-13. doi:10.1017/S1742758417000091
  • Muui Nancy Nyaruai, Robert Kinyua, and Ruth Gathu. (2016). Factors affecting management of safety and health in the building construction industry in Nakuru County, Kenya. International Journal of Innovation and Applied Studies Vol. 18 No. 1,  83-89
  • Ofgaa Djirata, Emana Getu and Kahuthia-Gathu, R. (2016). Trend in Mango Production and Potential Threat from Emerging White Mango Scale, Aulacaspis tubercularis (Homoptera: Diaspididae) in Central and Eastern Kenya. Journal of Natural Sciences Research Vol.6, No.7, 87-94.
  • L.K. Muriuki, George Muhia kariuki, Z. M. Kinyua, R.K. Gathu, D.L. Coyne (2014). Management of Root Knot nematodes-Bacterial wilt Compex using resistant tomato varieties in Coastal Kenya. Journal Of Nematology 46(2): 209-209.
  • Njau, N., M. Mwangi, R. Kahuthia-Gathu, R. Muasya and J.N. Mbaka. (2014). Macropropagation technique for producing cost-effective healthy banana seedlings in Eastern and central Kenya. CTA and FARA, Agricultural Innovations for Sustainable Development: Contributions from the 3rd Africa-Wide Women and Young Professionals in Science Competitions. Vol. 4 (3): 130-137.
  • Carolyne W. Wangungu, Maina Mwangi, Ruth Gathu, and Reuben Muasya. (2014). Good Orchard Maintenance and Agronomic Practices as Working Components in Management of Dieback Disease on Passion Fruit (Passiflora sp.) in Kenya. Annual Research & Review in Biology. 4(9): 1397-1405.
  • Kahuthia-Gathu R. (2013). Seasonal incidence of Plutella xylostella (Lepidoptera: Plutellidae) and its associated natural enemies in major crucifer growing areas of Kenya. Journal of Plant Breeding and Crop Science. Journal of Plant Breeding and Crop Science; Vol. 5 (5), 73-79.
  • Kahuthia-Gathu R., Gakunju R., Thungu J. and Okwarah P. (2013). Trends and emerging drugs in Kenya: A case study in Mombasa and Nairobi County. Journal of Applied Biosciences. Pg 5308 – 5325.
  • Ndungu, S. K., I. Macharia, R. Kahuthia-Gathu and R. G. Wahome (2013). Impact of organic vegetable production system in Kiambu and Kajiado Counties of Kenya. Journal of Environmental science and Engineering. 2:256-266.
  • Luchidio M.T., Kahuthia-Gathu R. and Gatebe E.1 (2013). Impact of training boda boda operators and safety status in Kakamega County, Kenya.  International Journal of Advance Research, IJOAR .org Volume 1, Issue 9, September 2013, Online: ISSN 2320-9151
  • Kahuthia-Gathu R. (2011). Seasonal incidence of Plutella xylostella (Lepidoptera: Plutellidae) and its associated natural enemies in major crucifer growing areas of Kenya; Journal of Applied Biosciences 46: 3103– 3112
  • N Njau, M Mwangi, R Gathu, J Mbaka, and R Muasya (2011). Banana weevil Cosmopolites sordidus reduces availability of corms for seedling production through macropropagation Journal of Animal and Plant Sciences [ISSN 2071-7024] Volume 12 (1), 1537-1542
  • Kahuthia-gathu R., Löhr, B., Poehling H-M. and Mbugua P.K. (2009). Diversity, distribution and role of wild crucifers in major cabbage and kale growing areas of Kenya. Bulletin of Entomological Research. 99 (3), 287-297
  • Kahuthia-gathu R., Löhr, B. and Poehling H-M. (2008). Effect of common wild crucifer species of Kenya on fitness of two exotic diamondback moth parasitoids, Cotesia plutellae and Diadegma semiclausum. Crop Protection. 27 (12), 1477-1484.
  • Gichini, G., Löhr, B., Rossbach, A., Nyambo B. and Gathu, R. (2008). Can low release numbers of parasitoids lead to establishment? Case of Diadegma semiclausum in East Africa. Crop Protection. 27, 906-914.
  • Kahuthia-gathu R., Löhr, B. and Poehling H-M (2008). Development and reproductive potential of diamondback moth, Plutella xylostella L. (Lepidoptera: Plutellidae), on cultivated and wild crucifer species in Kenya.  International Journal of Tropical Insect Science. 28,19-29.
  • Kahuthia-gathu R., Löhr, B. and Poehling H-M. (2008). Effect of common wild crucifer species of Kenya on fitness of two exotic diamondback moth parasitoids, Cotesia plutellae and Diadegma semiclausum. Crop Protection. 27 (12), 1477-1484.
  • Löhr, B., Gathu, R., Kariuki, C., Obiero, J. and Gichini, G. (2007). Impact of an exotic parasitoid on Plutella xylostella (Lepidoptera: Plutellidae) population dynamics, damage and indigenous natural enemies in Kenya. Bulletin of Entomological Research. 97, 337-350.
  • Löhr, B. and Gathu, R., (2002). Evidence of adaptation of Diamondback moth, Plutella xylostella (L.), to pea Pisum sativum L. Insect Science and its Application. 22, 161-173.

Books and Books Chapters

  • ·     2012: Kahuthia-Gathu Ruth: Importance of wild crucifers for diamondback moth, Plutella xylostella L. (Lepidoptera: Plutellidae) and its parasitoids in Kenya. LAP LAMBERT Academic Publishing GmbH & Co. Number:  42351 ISBN: 978-3-8465-8231-2
  • ·     NACADA Authority, Gachutha, C., Baya J., Gakunju, R., Gathu, R., Gachika, W., Njoka, C., Njani, E., Murimi, G. (2011). Peer educators training manual on alcohol and drug abuse; response to peer needs. Pg 95.

Articles and Abstracts in Conference Proceedings

  • Musango, J. K., Waceke, J. W., Ka­huthia-Gathu, R. (2019). Occurrence and Abundance of Plant Parasitic Nematodes on Tree Tomato (So­lanum Betaceum Cav.) in Kiambu and Embu Coun­ties, Kenya. Kenyatta University Biennial research and innovation conference 23-25th October 2019, Kenyatta University, Kenya
  • Agong, S. O., Mwangi, M., Kahuthia-Gathu, R. and Waceke J. W. (2019). Influence of Potato Production Practices of the Oc­currence of Potato Late Blight. Kenyatta University Biennial research and innovation conference 23-25th October 2019, Kenyatta University, Kenya
  • Kavutu, A. M., Mwangi, M., Ka­huthia-Gathu, R. and Waceke J. W.  (2019). Biocontrol Potential of An­tagonistic Bacteria Against Agrobacte­rium Tumefaciens on Roses in Kiambu County, Kenya. Kenyatta University Biennial research and innovation conference 23-25th October 2019, Kenyatta University, Kenya
  • Imbayi B., Kahuth­ia-Gathu, R., and Mwangi M. (2019). Use of Pher­omone Traps in the Management of Fruit Flies (Diptera: Tephritidae) on Mangoes Mangifera Indica in Central Kenya. Kenyatta University Biennial research and innovation conference 23-25th October 2019, Kenyatta University, Kenya
  • Imbayi B., Ignatius Stella, Kahuth­ia-Gathu, R., and Mwangi M.  (2019). Pesticide Use Practices In Horti­cultural Crops Pro­duction In Central Kenya. Kenyatta University Biennial research and innovation conference 23-25th October 2019, Kenyatta University, Kenya
  • M.W. Barasa, R. Kahuthia-Gathu, M. Mwangi and J. W. Waceke. (2019). Management of insect pests of tomato using indigenous antagonistic fungi in Kenya. Kenyatta University Biennial research and innovation conference 23-25th October 2019, Kenyatta University, Kenya
  • Barasa, W. M., R. Kahuthia-Gathu, Maina, M. and J.W.Waceke. (2019). Efficacy of indigeneous antagonistic fungi in management of Frankliniella occidentalis on tomato in Kenya. Contributed presentation during the 1st International Conference on Agroecology Transforming Agriculture and Food Systems in Africa. 18th-20th June, 2019. Safari Park Hotel & Casino, Nairobi, Kenya.
  • Barasa, W. M., R. Kahuthia-Gathu, Maina, M. and J.W.Waceke. (2018). Occurrence of arthropod pests and their management by tomato farmers in Bungoma County, Kenya. Contributed presentation during the 18th Workshop on Sustainable horticultural production in the tropics. 26th-30th November, 2018. Taita Taveta University, Voi, Kenya.
  • Barasa, W. M., R. Kahuthia-Gathu, Maina, M. and J.W.Waceke. (2018). Efficacy of entomopathogenic fungi in the control of Western flower thrips Frankliniella occidentalis in Kenya. Contributed presentation during the RUFORUM Biennial Conference. 22nd-26th October, 2018. Kenyatta International and Convention Centre (KICC), Nairobi, Kenya.
  • Barasa, W. M., R. Kahuthia-Gathu, Maina, M. and J.W.Waceke. (2018). Assessment of pests incidence, pesticide use and application practices on tomato production in Bungoma County, Kenya. Contributed presentation during the 2nd International Phytosanitary Conference. 4th-8th June, 2018. KEPHIS Headquarters, Nairobi, Kenya.
  • Okwarah, P., R. Gakunju, R. Kahuthia, and J. Thungu (2017). Emerging drugs of abuse: Current perspective on substituted opiates, nicotine, cannabinoids and cathinone among the urban populations in Kenya. At the NIDA International Forum at Montreal Canada, in June 2017
  • Kahuthia-Gathu R., Thungu, K.D., Kimani, R. and Wangu, L. (2016).Bostrichidae beetles associated with Acacia xanthophloea at Kenyatta University and Mitaboni in Nairobi and Machakos Counties, Kenya: 2nd biennial international conference held on 29th Nov- 2nd December 2016 at the Business and Student’s Services Centre (BSC) Kenyatta University
  • Kahuthia-Gathu, R. and Thungu, K.D.  (2016): Families of powderpost beetles and their associated natural enemies on Acacia xanthoploea in Machakos and Nairobi Counties, Kenya – 16th Workshop on Sustainable Horticultural Production In The Tropics, Held on 28th November – 2nd December 2016 at Chuka University, Chuka – Kenya.
  • Tarmogin, S. O., Komi, F. and Kahuthia-Gathu, R. (2016).Seasonal Abundance of Amaranth Lepidopteran Defoliators and the Role of Indigenous Parasitoids and Phenylacetaldehyde in their Control in Nairobi County, Kenya 2nd biennial international conference held on 29th Nov- 2nd December 2016 at the Business and Student’s Services Centre (BSC) Kenyatta University
  • Mwangi, G.I., Solveigh, and Kahuthia-Gathu R. (2016).  Evaluating the potential of entomopathogenic nematode isolates in the management of fruit fly species in Nairobi County: 2nd biennial international conference held on 29th Nov- 2nd December 2016 at the Business and Student’s Services Centre (BSC) Kenyatta University
  • Kariuki, A.N. and Kahuthia-Gathu, R. (2015). Evaluation of tomato leaf extract in management of cabbage aphid Brevicoryne brassica on kale in Nairobi County. 15th Workshop on Sustainable Horticultural Production in the Tropics. held on 1-4th Dec 2015 at Kenya Agricultural Research and Livestock Organization (KARLO), Kandara Center & Horticultural Research Institute (HRI), Murang’a County- Kenya
  • Omburo Stephen Tarmogin, Kahuthia-Gathu R and Fiaboe Komi (2015). "Performance of Apanteles hemara Nixon (Hymenoptera: Braconidae) on Spoladea recurvalis F and Udea ferrugalis Hubner (Lepidoptera: Pyralidae). 31st Conference of the Association of African Insect Scientist (AAIS) held in Cotonou, Benin from 19th-23rd October, 2015
  • Kahuthia-Gathu R., Nyambo B. and Subramanian (2013). Impact of introduced parasitoid Cotesia plutellae on Plutella xylostella and its parasitoid guild on kale in semi-arid areas in Kenya. 11th African Crop science society conference in Entebbe, Uganda; from14-17 October 2013.
  • S.K. Ndungu, I Macharia, R. Kahuthis-Gathu and R. Githaiga Wahome. (2013). Impact of organic vegetable production system in Kiambu and Kajiado Counties of Kenya. 11th African Crop science society conference in Entebbe, Uganda; from14-17 October 2013.
  • Kahuthia-Gathu R., Nyambo B. and Subramanian (2013). Spread and establishment of exotic parasitoid Cotesia plutellae on diamondback moth and parasitoid guild on kale in Semi-arid areas of Kenya Mount Kenya University, 1st International Research & Innovation Conference at Safari Park Hotel From 28th -30th Aug 2013.
  • Luchidio M. T., Kahuthia-Gathu R. and Gatebe (2013). Impact of training boda boda operators and safety status in Kakamega County, Kenya Mount Kenya University 1st International Research & Innovation Conference at Safari Park Hotel from 28th -30th  Aug 2013
  • Kahuthia-Gathu R., Gakunju R., Okwarah P., and Thungu J. (2013). The Trends and patterns of Emerging in Kenya. 2nd National Conference on Alcohol and Drug Abuse. Theme: The Youth and Drugs: A Call for action: at Moi International Sports Centre Kasarani Gymnasium on 10th -13th June 2013.
  • Ndungu, SK., Macharia, I. and Kahuthia-Gathu R. (2013). Analysis of profitability of organic vegetable production systemin Kiambu Counties of Kenya. African Crop Science Conference Proceedings 11, 605-611
  • Wangungu, C.W., Mwangi, M., Gathu, R. K. Muasya, R. and Mbaka, J. (2012).  Diversity of pathogens and symptoms associated with dieback on passion fruit in Kenya. Third RUFORUM Biennial Meeting 24 – 28th September 2012, Entebbe, Uganda. 1673-1677
  • Kahuthia-Gathu R and Maina Mwangi (2011). Studies on insect pests and diseases of chayote, sechium edule (swartz.) In Kenya aGRO 2011 Biennial Conference ‘Optimization Of Agricultural Value Chains For Sustainable Development’26th   – 28th September 2011
  • Kahuthia-Gathu Ruth. (2011). Seasonal incidence of Plutella xylostella Lepidoptera: Plutellidae) and its associated natural enemies in major crucifer growing areas of Kenya. 4th International e-Conference on Agricultural Biosciences.
  • C.W. Wangungu, M. Mwangi, R. Gathu, R. Muasya, J. Mbaka, & N. Kori. (2011).Reducing dieback disease incidence of passion fruit in Kenya through management practices; African Crop Science Conference Proceedings, Vol. 10.  pp. 1  - 4
  • Carolyne W. Wangungu, Ruth Kahuthia-Gathu and Maina Mwangi, (2010). Studies on the die back disease of passion fruit in major production areas in Kenya Proceedings of the 3rd International e-Conference on Agricultural BioSciences Page: 68 – 69.
  • Njeri Njau, Maina Mwangi and Ruth Kahuthia-Gathu (2010). Evaluating health of macropropagated banana seedlings. Proceedings of the 3rd International e-Conference on Agricultural BioSciences.  Page: 64 – 65.
  • Wangungu C.W., Maina. M, Gathu R. K., Mbaka, J., and Kori J. N., (2010). Passion fruit production in Kenya: Opportunities and constraints. Contributions of Agricultural Sciences towards achieving the Millenium Development Goals pg. 55- 63.
  • Wangungu, C.W., Mwangi, M., Mbaka, J., Kori, N. and Gathu, R., (2010). Studies on the etiology, epidemiology and management of dieback disease of passion fruit in Kenya. Second RUFORUM Biennial Meeting 20 - 24 September 2010, Entebbe, Uganda
  • Wangungu, C.W., Mwangi, M., Mbaka, J., Kori, N. and Gathu, R., (2010). Biotic constraints to passion fruit production in central and eastern provinces of Kenya. Second RUFORUM Biennial Meeting 20 - 24 September 2010, Entebbe, Uganda. Pg 239-241
  • Njau N. Maina M., Gathu R. K., Mbaka J. and Muasya R. (2010). Propagation of healthy banana seedlings in relation to pest and disease management. Contribution of Agricultural Sciences towards achieving the Millennium Development Goals Pg. 75 -86.
  • Kahuthia-Gathu Ruth (2006): Diversity, distribution and role of wild crucifers in major cabbage and kale growing areas of Kenya at the 5th International DBM Workshop in  24-28th October 2006: in Beijing, China
  • Lohr, B, Gathu R. K. and Momanyi, C. 2004. Biological impact of the exotic diamondback moth parasitoid Diadegma semiclausum (Hellen) in Kenya. Paper presented at the International Congress of Entomology, August 16-21, Brisbane, Australia.
  • Lohr, B. and Gathu R. 2003. Bio-control based IPM for the diamondback moth in Eastern and Southern Africa on IPM development and implementation in Africa, September 2003, Kampala Uganda.
  • 9-12th October 2000: Presented M sc. thesis paper on Evaluation of neem formulations for the control of selected pests of French beans (Phaseolus vulgaris) during Postgraduate Seminar, Kenyatta University.