| PROF.RICHARD OMBUI NYANKANGA

Bio

Prof.Richard Ombui Nyankanga

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(Last updated: April 16, 2021)

Publications

2018

R.O, N, Murigi WW, S. I. Shibairo, and O. M. Olanya, Larkin RP. 2018. Effects of foliar and tuber sprout suppressants on storage of ware potatoes under tropical ambient conditions. . American Journal of Potato Research . effects_of_foliar_and_tuber_sprout_suppressants_on_storage_of_ware_potatoes_under_tropical_ambient_conditions.pdf

Nyankanga, R, Murigi WW, Shibairo SI. 2018. Effects of foliar and tuber sprout suppressants on storage of ware potatoes under tropical ambient conditions. American Journal of Potato Research . Potato Research . Effects of foliar and tuber sprout suppressants on storage of ware potatoes under tropical ambient conditions.pdf

Nyankanga, RO, W.W. Murigi, undefined. 2018. Effect of packaging material on shelf life and quality of ware potato tubers stored at ambient tropical temperatures. Potato Research . 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

Gateri M.W., R. Nyankanga, Ambuko J, Muriuki AW. 2018. Growth, Yield and Quality of Onion (Allium cepa L.) as Influenced by Nitrogen and Time of Topdressing. . International Journal of Plant & Soil Science . 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. 2017. Genetic analysis of early-maturing maize (Zea Mays L.) inbred lines under stress and nonstress conditions. Journal of Crop Improvement. DOI: 10.1080/15427528.2017.1315625(31:4, ):560-588.

J., OJ, S. Mohamed, F.Olubayo, R. Nyankanga, I. A. Otieno, S. Mwalusepo, and G. Mwachala, Johansson T. 2017. 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 . 12(5):2457-2465.Spatial characterization of common blossom thrips (Frankliniella schultzei) in smallholder avocado orchards along slopes of Taita Hills and Mount Kilimanjaro

Odanga J. J, F.Olubayo, R. Nyankanga, S. Mwalusepo, Johansson T. 2017. 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 . 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.

Odanga J., S. Mohamed, F.Olubayo, R. Nyankanga, S. Mwalusepo, S.Subramanian, and T. Johansson, Ekesi. S. 2017. Datasets on abundance of common blossom thrips and weather variables in small-scale Avocado orchards at Taita Hills and Mount Kilimanjaro.. Insects. ( 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. 2017. . Genetic analysis of early-maturing maize (Zea Mays L.) inbred lines under stress and nonstress conditions. Journal of Crop Improvement. DOI: 10.1080/15427528.2017.(, 31:4, )Genetic_analysis_of_early_maturing_maize_zea_mays_l_inbred_lines_under_stress_and_nonstress_conditions.pdf

2016

Ojwang J. D, R.O. Nyankanga, and J. Imungi, Olanya MO. 2016. . Growth Parameters of vegetable pigeon pea varieties in Kenya. Horttechnology spotlight 5. nyankangaojwanghortechnology_spotlight_vol_97_pg_5_2016pdf.pdf

12. Ojwang J.D., R O.Nyankanga, J. Imungi, and M. Olanya, Ukuku D. 2016. Cultivar preference and sensory evaluation of vegetable pigeon pea (Cajanus cajan) in Eastern Kenya. Food Security . 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. 2016. Plant characteristics and growth parameters of vegetable pigeon pea cultivars. Subtropical Agriculture and Environments. ( 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. 2016. Yield components of vegetable pigeon pea cultivars. Subtropical Agriculture and Environments. ( 67:):1-12..Yield components of vegetable pigeon pea cultivars

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.

Nyankanga R. O., H. C. Wien, OOM. 2008. Effects of Mulch and Potato Hilling on Development of Foliar Blight (Phytophthora infestans) and the Control of Tuber Blight Infection. Potato Research. 51:101–111.

Nyankanga, RO. 2008. Development of Tuber Blight. (5)(43):1501-1508.abstract_2.pdf

2007

Kikuvi, GM, Schwarz S, Mitema ES, Kehrenberg C. 2007. Streptomycin and chloramphenicol resistance genes in Escherichia coli isolates from cattle, pigs, and chicken in Kenya. 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.

Nyankanga, RO, Wien HC, Olanya OM, Ojiambo PS. 2007. Relationship of foliar and potato tuber blight (Phytophthora infestans) as affected by foliage blight severity, cultivar resistance, atmospheric and soil variables.

Nyankanga, RO, Olanya OM, Wein HC. 2007. Schematic Models for Potato Tuber Blight Infection Based on Foliar Blight Severity, Cultivar Resistance, Soil and Atmospheric Variables.

Nyankanga, RO, Wien HC, Olanya MO, Ojiambo PS. 2007. 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. 29:372-387.