USE OF INTRACROPPING SYSTEMS FOR THE CONTROL OF STEM BORER (CHILO PARTELLVS) IN SORGHUM AND COWPEA APHID (APHIS CRACCIVORA) IN COWPEA

摘要

Resource-poor farmers in many areas all over the world often adopt farming strategies based on spreading risks, such as through interspecific and/or intraspecific diversity. Sometimes 2 or more crop species are grown in the same field at the same time(interspecific diversity) and/or 2 or more cultivars of the same species may be grown simultaneously in the same field (intraspecific diversity). Another level of intraspecific diversity is sometimes attained by growing genetically heterogeneous cultivars of the same crop (Allard, 1999).