Combination Effect of Different Insecticide Plants Against Acanthoscelides obtectus (Coleoptera: Bruchidea): Storage Pests of Common Bean (Phaseolus vulgaris).

摘要

The experiment was conducted to find out potential of insecticidal plants combination against Acanthoscelides obtectus through identifying the best potency of combinations and determining dosage rates. Leaf and seed powders of six insecticidal botanical plants, namely Jatropha curcas (L.), Allium sativum (L.), Citrus aurantifolia (L.), Eucalyptus globules (L.), Euphorbia tirucalli and Vernonia amygdalina Del. were mixed to 1% and 2% w/w binary formulations. The synthetic insecticide primiphos-methyl at the rate of 0.1/100 gm grain dust and untreated grains were used as positive and negative controls, respectively. High dosage rate of binary formulations (2% wiw) had better toxicity (high adult insect mortality) than low dosage rates formulations (1% w/w). Combinations of botanical powders showed highest adult mortality, F, progeny reduction and lowest weevil perforation index and weight loss comparable to untreated control. Allium sativum with Jatropha curcas combinations had best efficacy among the botanical combinations at both dosage rates of treatments. Every treatment combined with Allium sativum had better efficacy than the rest formulations.