Anna Kollenberg
Universität Erfurt
Abstract: Common bean (Phaseolus vulgaris L) is the main legume crop grown in Kenya, mostly by small scale farmers. Their grains are very vital in human nutrition and source of income for peasant farmers. The yield is 530 kg/ha which is lower compared to a production potential of 1400 – 2000 kg ha-1 and country’s production estimated at 613,902 metric tons per year. This production in Kenya has kept on declining due to poor seed quality, poor agronomic practices, abiotic and biotic factors. Biotic factors include Bean Common Mosaic Disease (BCMD), caused by Bean common mosaic virus (BCMV) and Bean common mosaic necrosis virus (BCMNV) are most wide spread with high disease incidence of upto 100% and yield loss of upto 98%. The objective of the study was; (1) to determine the effect of seed quality of common bean varieties on BCMD incidences, (2) to evaluate the effect of legume diversity intercrops on BCMV and BCMNV incidence. Trials on seed quality were laid in a randomized complete block design (RCBD) for; Rosecoco (market), Rosecoco (farm saved), Rosecoco (certified), KK8, KATX56, KK8 and KATX69 bean cultivars, randomly replicated three times. BCMD incidence and severity were calculated, recorded and leaf samples taken for serological tests. Trials on legume diversification also were laid on RCBD. Intercropped bean cultivars with other Legumes (Cowpeas and Groundnuts) and pure stands were randomly replicated three times. Incidence in both intercropped and purestand were observed and recorded. The results showed Rosecoco market had the highest incidence of 31.50%, while certified seeds had the lowest mean incidence of 24.42%. Purestands had high disease incidence (53.16%) than intercropped varieties (46.84%). Use of certified seeds and legumes intercropping with beans reduce BCMD incidences.
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