EFFECT OF INDIGENOUS PLANT POWDERS ON PULSE BEETLE, Callosobruchus maculatlls (F.) (COLEOPTERA : BRUCHIDAE)
The pulse beetle, Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) is a major pest of black gram, cowpea and greem gram (Park et aI., 2003). It causes substantial loss to pulses during storage period in house hold and godowns. The larvae bore into the pulse grains and render them unsuitable for human consumption and also affect germination. Use of synthetic insecticides leads to serious problems of pest resistance, pest resurgence, residual toxicity and environmental hazards (Talukder and Howse, 2000). Plant-derived materials are more readily biodegradable, lcss toxic to mammals and are economically feasible. Plant derived powders, when mixed with storcdgrains, reduce oviposition rate and suppress the adult emergence of C. macufatus, and also reduced seed damage (Tapondjou et al., 2002).In thc present study, thercfore, ten plant powders were tested against the pulse beetle, C.lIlaculatus on black gram (Vigna mungo L.)secds. Laboratory experiments (biological and mortality studies) wcrc carried out at Agricultural College and Research Institute, Killikulam during 2003 - 2005. Callosobruchus maculatus was reared on black gram seeds in glass jars covered with muslin cloth by following the mcthod developed by Credland and Wright (1989). Plant powders of ten species (Tablc I) wcre preparcd aftcr shade drying of desired parts.
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