The role of parasitoids in regulation of beanfly ophiomyia spp. Complex, at Kakamega, Kenya.

Investigations were carried out on the phenology of beanflies (Ophiomyia spp.) and their parasi toids under different cultural practices (cropping system and different fertilizer levels) ln the field in Kakamega, Western Kenya. Three species of beanflies Ophiomyia spencerella (Greathead) , Ophiomyia phaseoli (Tryon) and Ophiomyia centrosemantis (de Meij) were recorded. Of these, O. spencerella was the dominant species constituting over 94% of the beanfly complex in Kakamega while O. phaseoli and O. centrosemantis constituted 4% and 2% respectively.

Line By Tester Analysis Of Elite Tropical-Temperate Maize Lines Under Water-Stress And Non-Stress Environments

Maize is the second most cultivated cereal crop in the world after wheat. In spite of its importance, the production challenges have continuously led to poor yields in sub-Saharan Africa. This has called for need to improve varieties that are adapted to the tropical ecosystem.

Genetic Analysis Of Resistance To Aspergillus Ear Rot And Aflatoxin Accumulation In Maize (Zea Mays L.) Inbred Lines

Recurrent aflatoxin contamination in maize has been a major problem in Kenya as it consistently causes loss of produce and lives resulting to massive economic losses. Kenyan maize germplasm are susceptible to aflatoxin accumulation hence there is need to incorporate resistance genes into these germplasm. Therefore, the objective of this study was to improve quality and safety of maize through development of hybrids that are resistant to Aspergillus flavus and aflatoxin contamination. Seventy F1 hybrids were generated from North Carolina II (NCDII) cross among seventeen inbred lines.

Social interactions and returns to farm inputs in smallholder agriculture in Kenya

This study is motivated by a desire to establish the extent to which social interactions affect production behavior of farmers and returns in smallholder agriculture in Kenya, aspects that are absent from the existing literatures in Africa. Social interactions include learning and peer relationships that exist among economic agents. The study is further motivated by concerns about poverty effects of incomes that are mediated through social interactions.

Integrating host resistance with tolerance in multiple cropping systems for management of plant parasitic nematodes in sugarcane

Sugarcane productivity in Kenya has been on the decline over the past decade due to various factors including pests and diseases. Plant parasitic nematodes (PPNs) are known to infest sugarcane fields due to poor agronomic practices that include use of traditional varieties, continuous monoculture and inadequate fertilizer use.

Evaluation for resistance to the spotted stem borer, Chilo partellus, in a maize (Zea mays L.) population

Genetic variability and predicted responses to S2 and testcross selection methods were studied in an open-pollinated variety resistant to the spotted stem borer, (Chilo partellus Swinhoe). Evaluation after one cycle of selection for grain yield and parameters of resistance to the borer were investigated. Genetic variances and heritability estimates were moderate to high for the S2 progenies with heritability estimates being higher for the agronomic traits compared to the parameters of resistance.

Enhancing Food Security Through Increased Potato Production In Kenya

Potato in Kenya is an important food and cash crop that plays a major role in food security and is only second to maize in terms of utilization. The crop has higher yields per unit area (40 tonnes per hectare) than most of the major food crops including maize and beans. Potato production has been increasing due to economic decline of competing cash crops such as maize, coffee and pyrethrum, and increasing demand from consumers and processors. Approximately 500,000 Kenyan smallholder potato farmers produce about 1 million tonnes from 100,000 ha of cultivated land area.

Head blight of wheat in Kenya and contamination of grain with mycotoxin producing Fusarium species

The study was carried out during the 2006 cropping season in Nakuru district, Kenya. Incidence and severity of head blight were determined and pathogens isolated from diseased wheat heads, wheat and maize kernels. Mycotoxin deoxynivalenol content in grain was determined by direct competitive Enzyme-Linked Immunosorbent Assay (ELISA). Pathogenicity of different Fusarium species isolated from wheat was determined by inoculation onto wheat ears in greenhouse. Head blight was highly prevalent (90-100%) and mean incidence and severity ranged from 4 to 9% and 15 to 37%, respectively.

Design and Characterization of a Hybrid Flat Plate Photovoltaic-thermal System

A variety of solar energy systems have been designed to harness sun power to produce both thermal and electric energy. Hybrid photovoltaic/thermal (PV/T) solar energy harnessing systems can concurrently provide electric and heat energy, thereby ensuring a higher conversion rate of a beam of solar radiation. A well designed PV/T system can minimize temperature influence on the electrical efficiency of a Photovoltaic module by continually cooling it.

Fabrication and Characterization of Germanium Doped Titanium Dioxide (Ge:TiO2)Thin Film for Photovoltaic Application

This study intends to realize 3 novel thin film material for photovo ltaic appl ications. Ti02 that has a I3rge band gap of 3.2eV is sensitized to visible light via the use of dyes in the Gratzel cell. The dye monolayer when excited by light photons. electron-hole pairs are generated. electrons are injected into the conduction band ofTi02, while the holes are transported t" the counter electrode by diffusion The LIse of dye and wet electrolyte material has associated instability problems which threatens the suitability ofthis type of solar cell for commercia lizauon purposes.


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