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Conference Documents: Recent submissions
Now showing items 241-260 of 597
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Future of plant virus disease research in subSaharan African agriculture
(2003)In sub-Saharan Africa (SSA), many crops grown by subsistence farmers are severely affected by virus diseases. These diseases are distinct from each other and have various means of spread and perennation. Many are widely distributed in the region. The causal agents of several virus diseases have been characterized and diagnostic methods developed. Crop varieties with acceptable levels of resistance are being developed for some of these diseases. However, this information and the materials are often ... -
Population density and distance to market does not influence the farmers use of organic manure.
(2008)This study developed and employed a socio-economic-ecological-modeling (SEEM) framework in its analyses. The SEEM is made up of four resource use domains of highlow population density and highlow access to market and two agro-ecologies in the savanna of Nigeria. Data used comprises a sample of 320 farm households in northern Nigeria. The pattern of organic manure use varied slightly and insignificantly across agro-ecological and resource use domains. The major finding of the study is that the ... -
Beauveria bassiana as an artificial endophyte in tissuecultured banana (Musa spp.) plants: a novel way to combat the banana weevil Cosmopolites sordidus
(2008)Beauveria bassiana, which is effective against a variety of insect pests, is the most researched and commercialised fungal biopesticide. Laboratory and screenhouse studies have revealed great potential of this entomopathogenic fungus for use against the banana weevil, Cosmopolites sordidus, in banana. However, impractical field delivery methods and high costs associated with the application of B. bassiana against C. sordidus prevent its use and commercialisation in banana fields. Our research has ... -
Effectiveness of breeding and disseminating CMDresistant cassava varieties in western Kenya
(2005)In 1996, Cassava Mosaic Disease in Western Kenya depressed productivity and de-stabilized markets. The study assesses the effectiveness of breeding and disseminating CMD-resistant varieties in western Kenya by determining the extent of adoption and impact on farmers' income of the new varieties vis-àvis the level of investment in the program as well as the factors that influenced their adoption. Results show that the new varieties significantly increased production and marketing potential of cassava ... -
Influence of genotype and developmental stage on plant dry matter distribution and shootroot ratio in banana and plantain
(2005)Detailed time studies on the distribution of dry matter within a Musa spp. plants ' root and shoot system have not been done. Hence, the influence of genotype and developmental stage on the root system development, plant dry matter distribution and the shoot-root ratio of field grown Musa spp. plants was assessed in this study. Experiments were done at the International Institute of Tropical Agriculture Onne High Rainfall station, Nigeria in an ultisol soil. Plants were assessed at four weekly ... -
Root and shoot development during the plant crop and the first ratoon of banana and plantain (Musa spp.) with implications for perennial cultivation on degraded Ultisols in southeastern Nigeria
(2006)The effect of cycle on root system and shoot development was studied for two crop cycles (plant crop and first ratoon). The study revealed that shoot and root system development declined from the plant crop to the first ratoon for plants grown on degraded Ultisols in south-eastern Nigeria. -
Maize yield response to Mucuna pruriens and Pueraria phaseoloides cover crop fallow and biomass burning versus mulching in farmer managed onfarm experiments
(2006)Maize was relay cropped with the cover crops Mucuna pruriens or Pueraria phaseoloides for between 1 and 7 consecutive years in three sites, Ngoungoumou, located in an area of low land use intensity (LUI), about 100 km away from the next major market, and at Evendissi and Andok, in a medium LUI area, 15 to 20 km away from the next major market. Maize yield was compared with that in natural fallow, with fallow biomass burned versus retained as mulch. Fallow type had no effect on maize density. Biomass ... -
Identification of constraints to banana production in three ecoregions of Rwanda
(2007)A survey was carried out in 108 fields in Rwanda to identify constraints to banana productivity in three regions: Ruhengeri (young volcanic soils), Gitarama–Butare (soils derived from granitic rocks), and Kibungo (weathered soils from schistose materials). Data were recorded for the single cultivar Intuntu (AAA)EA). We recorded management practices, and measured nutrient contents in plant and soil, root health parameters and nematode populations. Bunch weights were estimated (r2 = 0.6?) using ... -
Recent advances in breeding for Striga resistant extraearly maize for the savannas of West and Central Africa
(2007)Striga hermonthica is a major constraint to increased maize production and productivity in the savannas of West and Central Africa OVCA. The IITA-WECAMAN Maize Program has developed two extra-early source populations and several extra-early varieties, synthetics and inbred lines with resistance/tolerance to drought and/or S. hermonthica, eleven extra-early maturing varieties were evaluated at Ferkessedougou, Abuia and Mokwa in 2002 and at Mokwa and Abuja in 2004 under artificial Striga infestation ...
