Working Document Series Open Access The existence and distribution of cassava bacterial blight in East Africa D. Kilalo · A. Livoi · A. W. Mwang’ombe Cassava bacterial blight is one of the major bacterial diseases in all cassava growing regions in the world. The disease is caused by Xanthomonas axonopodis PV. Manihotis, a gram-negative rod shaped and belongs to the Gammaproteobacteria. … RUF-38732 2018 CC BY 4.0 15 Sep 2020
Working Document Series Open Access Efficacy of hot water treatment in management of sugarcane ratoon stunting disease J.W. Muthomi · R.D. Narla · E. S. Philip · G. M. Riungu Sugarcane ratoon stunting disease (RSD) caused by the bacterium Leifsonia xyli subsp. xyli causes huge losses to sugarcane ratoon crops. Hot water treatment is commonly used in many countries to control RSD but conflicting results show tha… RUF-38730 2018 CC BY 4.0 15 Sep 2020
Working Document Series Open Access Reaction of Rice Blast Pyricularia oryzae CAV. isolates on a set of improved rice varieties in Western Kenya indicator to presence of pathogenic strains M. G. Kariaga · R. Onamu · J. Wakhungu · H. K. Were Rice (Oryza sativa L.) remains the most favoured grain for human consumption in the world. The yields in Kenya and many African countries are below the world averages. Rice blast disease has been registered as a major cause for reducing yi… RUF-38722 2018 CC BY 4.0 13 Sep 2020
Working Document Series Open Access Management of bacterial wilt of tomato using resistant rootstocks J.W. Muthomi · E. W. Mutitu · J. N. Onduso Bacterial wilt (Ralstonia solanacearum) is a devastating disease of tomato that is quickly spreading and affecting many fields causing a reduction in yield and income to farmers. The objective of the study was to determine the effect of us… RUF-38718 2018 CC BY 4.0 13 Sep 2020
Working Document Series Open Access Heterosis for fruit yield, yield components and bacterial wilt resistance of tomatoes genotypes in Kenya F. K. Kathimba · P. M. Kimani · L. M. Kiriika · R.D. Narla Yields of tomato (Solanum lycopersicum) in Kenya has continued to decrease due to biotic stresses especially bacterial wilt (Ralstonia solanacearum), fungal diseases, nematodes, tomato yellow leaf curl and overreliance on low yielding vari… RUF-38715 2018 CC BY 4.0 13 Sep 2020
Working Document Series Open Access Effect of maize lethal necrosis disease on seed quality of commercial hybrid varieties T. N. Kinyungu · D.W. Miano · J.W. Muthomi · F. Olubayo The recent maize outbreak of maize lethal necrosis (MLN) disease is a big threat to the already strained food security in Kenya. The disease is caused by co-infection of maize with Maize chlorotic mottle virus and cereal potyviruses mostly… RUF-38710 2018 CC BY 4.0 13 Sep 2020
Working Document Series Open Access Occurrence of fungal and bacterial diseases of common bean (Phaseolus vulgaris) in western Kenya J.W. Muthomi · P. B. Ochichi · J.M. Wagacha Bacterial and fungal diseases of common bean (Phaseolus vulgaris) are a major constraint in production of the crop in western Kenya. The objective of this study was to determine the occurrence of fungal and bacterial diseases of common bea… RUF-38708 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Efficacy of indigenous fungi isolates against root-knot nematodes (Meloidogyne spp) in-vito A. N. Kariuki · M. Maina · J.W. Waceke Root knot nematodes (Meloidogyne spp.) are a serious problem in smallholder tomato farms causing 90-100% yield loss in tomato crop in Kenya. For sustainable food production, effective management of nematodes is primarily dependent on the a… RUF-38700 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Trends in cassava brown streak disease diagnostics for certification of healthy cassava planting materials and future perspectives: A review D. Kilalo · I. Macharia · F. Munguti · A. W. Mwang’ombe +1 more Cassava (Manihot esculenta Crantz) is important for food security and livelihoods of more than 500 million people in sub-Saharan Africa particularly for poor subsistence farmers. However, its productivity is hampered by cassava brown strea… RUF-38697 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Effect of root knot nematode, Meloidogyne spp. on the growth and productivity of tea clones in Meru County of Kenya James Wangai Kimenju · I. H. Mogeni · W.M. Muiru Plant parasitic nematodes have been reported in tea plantations in Kenya and have been associated with loss of tea plants in some areas. Nematodes associated with tea have been found to be well distributed in Ngere catchment of Murang’a Co… RUF-38694 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Occurrence and distribution of groundnut rosette disease in Western Kenya A. S. Mabele · B. Mukoye · M. F. O. Ndong’a · O. P. Orakha +2 more Groundnut (Arachis hypogaea Linn) is an important legume in western Kenya, but yields are low and declining. Pests and diseases are ranked high among the yield reducing factors. Groundnut rosette disease (GRD) is the main disease and can c… RUF-38692 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Effect of legume extracts on root rot pathogens and germination of common bean (Phaseolus vulgaris) W. J. Muthomi · R.D. Narla · J. Nderitu · J. Ojiem +1 more Application of undecomposed green manure have been reported to result in poor germination and crop establishment thus poor yields. To understand the mechanism through which low emergence occurs, various legume extracts from lablab, soybean… RUF-38672 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Increasing yellow passion yields by managing water stress using hydrogel, polythene and grass mulches in Embu and Kiambu Counties, Kenya N. Korir · J. M. Michoma · J.N. Mugwe · M. Mwangi ver the years, farmers in dry areas of Africa have depended on a narrow range of crops that tolerate water stress for nourishment and income generation. Yellow passion fruit production is a lucrative venture of much higher income compared … RUF-38668 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Morphological response of selected passion fruit varieties to limiting water status J. O. Gweyi · M. M. Kimani · M. Mwangi · S. Runo Passion fruit (Passiflora spp.) is the third most common fruit in Kenya. It belongs to the Passifloraceae family with three species under production in Kenya. The Kenya Agricultural and Livestock Research Organization (KARLO) released thre… RUF-38665 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Is there potential for integrated soil fertility management use in Machakos County, Kenya? B. Danga · K. Kwena · R. Osiyo · S. W. Wamalwa Chronic food insecurity in Machakos and other semi arid areas in Kenya could be attributed to climate variability but mainly to soil nutrient decline. A lot of resources have been directed to smallholder farmers in drylands in the past but… RUF-38658 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Socio-cultural aspects in harvesting of Jackfruit in Busia County, Kenya C. Gitonga · V. O. Kirigua · G. Mbure · V. Ochieng +2 more This study assessed the socio-cultural dimensions of harvesting jackfruit in Busia County of Kenya. Data were collected using quantitative and quantitative methods with farmers (i.e., structured interviews, key informant interviews and fie… RUF-38653 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Effect of controlled release urea on soil nitrogen mineralization and maize yield in Siaya County, Kenya A. N. Karanja · B. Mochoge · R.N. Onwonga · C. Shisanya +1 more Although nitrogen (N) is a major limiting nutrient in most soils in Kenya, it is often lost before it is used up by crops. This is due to the high dynamics of its transformations in the soil, making it easily lost from the soil. This usual… RUF-38651 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Status of production of Jackfruit (Artocarpus heterophyllus Lam.) in Busia County, Kenya C. Gitonga · V. O. Kirigua · V. Ochieng · L. Wasilwa +1 more Jackfruit is one of the underutilised fruits in Kenya which has potential to contribute to food and nutrition security. However, little is known about the status of jackfruit production in the country. This study assessed the status of jac… RUF-38646 2018 CC BY 4.0 12 Sep 2020
Working Document Series Open Access Moisture stress reduces stomata conductance, growth and yield of soybean K. E. Cheruiyot · L. H. Mwamlima · J.P. Ouma Soybean [Glycine max (L) Merrill] yield amongst smallholder farmers in Kenya is low and range from 445-1200 kg ha-1. These low yields are attributed to various factors including moisture stress and use of poor agronomic practices. Optimiza… RUF-38634 2018 CC BY 4.0 7 Sep 2020
Working Document Series Open Access Signaling and cross-talk between Salicylic Acid and Abscisic Acid phytohormones on Net Blotch, Aluminium toxicity and drought stresses in barley S. Gyawali · J.O. Ochuodho · N.K. Rop · J.O. Were Varying levels of abscisic acid and salicylic acid whose effects can be antagonistic or synergistic are produced by plants including barley under stress conditions. This scenario has not been explored in details and scientifically document… RUF-38630 2018 CC BY 4.0 7 Sep 2020
Working Document Series Open Access Effects of inorganic fertilizer applications on grain yield, nutrient use efficiency and economic benefits of maize in Western Kenya G. Chemining’wa · C.K.K. Gachene · H. M. O. Otieno · S. Zingore Declining soil fertility levels due the application of low rates and unbalanced nutrients is the main cause of low yields in western Kenya. We therefore designed a randomized complete block nutrient omission trial with six replications to … RUF-38629 2018 CC BY 4.0 7 Sep 2020
Working Document Series Open Access Comparative effects of soybean, grain amaranth (Amaranthus spp) and nitrogen on Striga (Striga hermonthica) and maize yield in western Kenya W. K. Ngetich · E. K. Ronoh · V. K. Rotich · C. Serem Western Kenya, the area considered the grain basket of the country, is heavily infested by Striga, reducing maize yields by up to 30-100%. On-farm trials were conducted in two cropping seasons between August 2014 to July 2015 at Ugunja, Si… RUF-38623 2018 CC BY 4.0 4 Sep 2020
Working Document Series Open Access Influence of Niger plant (Guizotia abyssinica l.) on growth and development of common beans (Phaseolus vulgaris) O. A. Auma · L. Ngode · L. M. Oimbo Plants affect other plants growing in their vicinity either positively or negatively by producing exudates known as secondary metabolites. These secondary metabolites, also known as allelochemicals, can be harnessed and utilized in control… RUF-38619 2018 CC BY 4.0 4 Sep 2020
Working Document Series Open Access Characterization of tomato accessions for breeding research in Kenya F. K. Kathimba · P. M. Kimani · L. M. Kiriika · R.D. Narla Understanding the phenotypic traits of germplasm through cultivation and assessing the morphological and agronomic characters facilitates selection of suitable parents for a breeding programme. Although tomato is the leading vegetable crop… RUF-38610 2018 CC BY 4.0 4 Sep 2020
Working Document Series Open Access Evaluation for seed yield and related traits among ecotypes of Cenchrus ciliaris L. G. Chemining’wa · E. C. Kirwa · W. N. Mnene · E. K. Ngugi Cenchrus ciliaris is widely promoted as a choice grass species for reseeding Arid and Semi-arid Lands (ASALs). Nine ecotypes of C. ciliaris collected from selected sites in Kenyan ASALs were evaluated for seed yield and related traits in t… RUF-38602 2018 CC BY 4.0 4 Sep 2020
