Compatibility of intercropping stem borer resistant sorghum Sorghum bicolor Moench genotypes with cowpea Vigna unguiculata (L) Walp and its effect of flower thrips
1994
Ampong-Nyarko, K. | Nyang'or, R.A. | Saxena, K.N. | Seshu Reddy, K.V. (International Centre of Insect Physiology and Ecology, Nairobi (Kenya))
The compatibility of sorghum Sorghum bicolor Moench genotypes with varying levels of resistance to stem borers for intercropping was studied in field experiments for two cropping seasons at the ICIPE in Kenya. Sorghum genotypes IS-18520, IS-1044, IS2269, ICS 3, ICS 4, LRB6, 2K x 17 and Gaddam El Hamam were grown both as monocrops and as intercrops with cowpea. Intercropping reduced the Chilo partellus population density but there was no significant genotype - intercropping interaction. Intercropping significantly reduced the number of flower thrips Megalurothrips sjostedti in cowpea Vigna unguiculata (L.) Walp. The stem borer resistance level of sorghum genotypes tested was not affected by intercropping. There were, however, differences in agronomic productivity. Grain yield of intercropped sorghum was positively correlated with the number of tillers per harvestable head. Sorghum genotypes with high tillering capacity, of intermediate plant height and intermediate leaf area were considered compatible for intercropping with cowpea.
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