The Effect of Some Alcoholic and Aqueous Plant Extracts on the Adults of the Southern Cowpea Beetle Callosobruchus Maculatus (Fab.) (Coleoptera: Chrysomelidae)

This laboratory study was conducted to test the effect of extracts of plants, leaves and sepals of hibiscus plant Hibiscus sabdariffa, leaves of Pinus sp and leaves of Eucalyptus Camaldulenis on the mortality of adults southern cowpea weevil Callosobruchus maculates (Fab) with six concentrations (1000, 2000, 5000, 7000, 9000, 10000) ppm / adult and using the solvent (ethanol and distilled water) and the results were noted after 24 and 48 hours of treatment. The study also tested the effect repellency and attraction Extract ethanol & aqueous plants under study against insect adults and after 15 and 30 minutes of treatment. The results showed that there were influential for each plant extracts used in the study of death adults. Results of the statistical analysis showed that there were significant differences in the toxicity of plant extracts depending on the type of plant and extract concentration, where it was noted that mortality rates increased in direct correlation with the increase in concentration and duration of exposure in each treatment. So, the results showed a various effect in the proportions of attraction and repellency depending on the type of plant extract concentration and time against adults. The results showed that the alcoholic extracts of plants under study super-passed significantly the aqueous extracts on death of adults. And eucalyptus leaves extract in solvents (ethanol and distilled water) outweigh all plant extracts used in the study in their impact on the insect. While the plant extract Hibiscus sepals is the least influential in the insect.