Research Interests: Genetics, Technology, Biology, Biological Sciences, Foraging, and 4 moreHabit, Cultivar, Pigeonpea, and Population Study
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... Debelo (ed.)Belay Simane (ed.).- Addis Abeba (Ethiopia): Crop Science Society of Ethiopia, May 2006. The Conference of the Crop Science Society of Ethiopia,The Conference of the Crop Science Society of Ethiopia, 11, Addis Abeba... more
... Debelo (ed.)Belay Simane (ed.).- Addis Abeba (Ethiopia): Crop Science Society of Ethiopia, May 2006. The Conference of the Crop Science Society of Ethiopia,The Conference of the Crop Science Society of Ethiopia, 11, Addis Abeba (Ethiopia), 26-28 Apr 2004.- p. 33-39. ...
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... KENYAN LINES CFPHASEOLUS VULGARIS L. AND PHASEOLUS ACUTIFOLIUS A. GRAY SD Obukosia, Kimani Waithaka, VK Gupta, PMKimani Department of ... 1). Lack of rooting was also reported by Evans (1962) in in vitro interspecific hybridization... more
... KENYAN LINES CFPHASEOLUS VULGARIS L. AND PHASEOLUS ACUTIFOLIUS A. GRAY SD Obukosia, Kimani Waithaka, VK Gupta, PMKimani Department of ... 1). Lack of rooting was also reported by Evans (1962) in in vitro interspecific hybridization within the genus Trifolium ...
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A study was conducted in the glasshouse and under laboratory conditions to verify diversity in Fusarium udum of pigeonpea in Kenya using several isolates of the fungus collected from both traditional pigeonpea growing areas and new ones.... more
A study was conducted in the glasshouse and under laboratory conditions to verify diversity in Fusarium udum of pigeonpea in Kenya using several isolates of the fungus collected from both traditional pigeonpea growing areas and new ones. Glasshouse tests using twelve pigeonpea lines gave consistent differences in virulence in these isolates. There were also strong differences in growth traits, such as growth rate (aggressiveness), growth habit and morphology, in these isolates in laboratory tests. Therefore, these isolates are true variants of this pathogen. There are as yet no pigeonpea differentials for Fusarium and so it could not be confirmed whether the isolates are races of F. udum in Kenya or not. Its implication in framing a breeding strategy has been discussed.
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A study was conducted in the glasshouse and under laboratory conditions to verify diversity in Fusarium udum of pigeonpea in Kenya using several isolates of the fungus collected from both traditional pigeonpea growing areas and new ones.... more
A study was conducted in the glasshouse and under laboratory conditions to verify diversity in Fusarium udum of pigeonpea in Kenya using several isolates of the fungus collected from both traditional pigeonpea growing areas and new ones. Glasshouse tests using twelve pigeonpea lines gave consistent differences in virulence in these isolates. There were also strong differences in growth traits, such as growth rate (aggressiveness), growth habit and morphology, in these isolates in laboratory tests. Therefore, these isolates are true variants of this pathogen. There are as yet no pigeonpea differentials for Fusarium and so it could not be confirmed whether the isolates are races of F. udum in Kenya or not. Its implication in framing a breeding strategy has been discussed.
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Research Interests: Biology and Cercospora
Seventy-nine single-spore isolates of Fusarium udum, the causal agent of wilt disease of pigeonpea, from Kenya, India and Malawi were characterized according to their cultural characteristics, pathogenicity and vegetative compatibility... more
Seventy-nine single-spore isolates of Fusarium udum, the causal agent of wilt disease of pigeonpea, from Kenya, India and Malawi were characterized according to their cultural characteristics, pathogenicity and vegetative compatibility group (VCG). The isolates exhibited high variation in pathogenicity on a wilt-susceptible pigeonpea variety, and in mycelial growth and sporulation on potato dextrose agar medium. The 79 isolates were categorized
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Lack of information on the mode of inheritance of photoperiod sensitivity is a constraint to genetic improvement of tropically adapted vegetable runner bean. This study was conducted to determine the inheritance of short-day photoperiod... more
Lack of information on the mode of inheritance of photoperiod sensitivity is a constraint to genetic improvement of tropically adapted vegetable runner bean. This study was conducted to determine the inheritance of short-day photoperiod in runner beans. Seven single crosses between female parent; White Emergo (long day imported variety) and seven short day local landraces (Kin 1, Kin 2, Kin 3, Nyeri, Dwarf1, Dwarf 2 and Dwarf 3) were developed in Kenya. The parents, F1, F2 and backcrosses were evaluated at Kabete (warm conditions) and Ol Joro-Orok (cool condtions) under the natural short-day length of 12hrs. From the results, short day parents flowered earlier (within 40-48 days) and formed more racemes (on average 10 racemes/plant) and pods (at least 25pods/plant) than long day parent (White Emergo) at both locations. The populations in the seven cross combinations flowered earlier at the warmer location (Kabete) than cooler one (Ol Joro Orok). In all crosses, F1 and F2 means of da...
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Bean crops depend on symbiotic fixation to meet part of their nitrogen requirements. The balance is obtained from the soil. Nitrogen deficiency is the most important constraint to bean production in sub-Saharan Africa causing annual... more
Bean crops depend on symbiotic fixation to meet part of their nitrogen requirements. The balance is obtained from the soil. Nitrogen deficiency is the most important constraint to bean production in sub-Saharan Africa causing annual losses of more than 389,000 t per ...
Research Interests: Report, Rhizobium, Nodulation, Climbing, Rhizobia, and 4 morePhaseolus vulgaris, Inoculation, Rendimiento, and Yields
Harmonizing the agricultural biotechnology debate for the benefit of African farmers
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Inheritance of fusarium wilts (Fusarium oxysporum F. sp. phaseoli) resistance in climbing beans
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Although tomato is the leading vegetable crop in Kenya, not much work has been done to develop improved tomato varieties with farmer preferred and market demanded traits. This study aims to characterize ten tomato genotypes for... more
Although tomato is the leading vegetable crop in Kenya, not much work has been done to develop improved tomato varieties with farmer preferred and market demanded traits. This study aims to characterize ten tomato genotypes for morphological and agronomic traits and to identify potential parental lines for use in the breeding program. The experiments were conducted in Kenya during the 2017 long and short rain seasons. Trials were laid out in a randomized complete block design with three replicates. Study materials were AVTO1429, AVTO1424, AVTO1314 from World Vegetable Center, four commercial varieties namely; Riogrande, Cal J, Roma VF, UC82 and three farmer selections namely; Valoria, Danny and Eden select. Genotype effects, genotype x environment interactions and location effects for days to flowering, plant height, maturity, fruit yield and related traits were highly significant (P<0.01). Duration of flowering varied from 36 to 42 days; plant height from 66.37 to 182.57cm, dura...
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... Sim-ilarly, where there is accelerated phenology, reproductive growth may coincide with a period of high pest incidence (Wallis et al. ... These cultivars were: KO 71/3, KO 91, KO 109, KZ 63, KZ 69/2, Kat 50/3, Kat 60/8, and ICPLs 87... more
... Sim-ilarly, where there is accelerated phenology, reproductive growth may coincide with a period of high pest incidence (Wallis et al. ... These cultivars were: KO 71/3, KO 91, KO 109, KZ 63, KZ 69/2, Kat 50/3, Kat 60/8, and ICPLs 87 W, 83016, 86005, 86023, 87091, 87109, 89030 ...
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This study was conducted at Mwea and Embu where 20 F6.7 lines selected from 31 bulk populations were evaluated for reaction to diseases, pod quality and pod yield in on-farm trialsduring the 2013 long rain and short rain seasons. Diseases... more
This study was conducted at Mwea and Embu where 20 F6.7 lines selected from 31 bulk populations were evaluated for reaction to diseases, pod quality and pod yield in on-farm trialsduring the 2013 long rain and short rain seasons. Diseases were scored on a scale of 1 to 9, where scores of 1-3 were considered resistant, 4 to 6 intermediate, and 7 to 9 susceptible. Two rows per plot of each genotype were harvested three days a week and pods graded as extra-fine, fine and bobby using standard commercial criteria. Genstat Version 15 software was used for analysis of variance and mean separation. Results showed that there were significant differences among the lines forpod quality, pod yield and resistance to angular leaf spot and anthracnose. Seven new lines showed combined resistance to angular leaf spot rust and anthracnose at both sites contrastingwith commercial checks which were susceptible. Angular leaf spot was more severe at Embu, where plots were irrigated with overhead sprinkle...