The effect of extracts from (Commiphora Spatholata) Stem exudate on the biology of bean seed weevil, acanthoscelides obtectus (Bruchidae: Coleoptera)

This work tested the possible effects of extracts from the mature stem exudate Commiphora spathulata on Acanthoscelides obtectus. Three solvents, (ether, chloroform and petroleum ether), were used to extract organic material from this pl exudate. The extracts together with the crude material, (exudate) were tested for repellency effect, inhibition on oviposition and on post-developmental stages. Z extracts and crude material were used at 5, 10, 15, 20, 25 and 50 g/l. Two-choice test was used for the repellency test and no-choice test for oviposition preference and post-developmental stages tests. The results from this research show that, the exudate and ethanol extracts have repellency effect on adult females. All of the four extracts had negative effect on oviposition and post-embryonic stages Acanthoscelides obtectus. These results were verified by different statistical tests. A; natural product, this type of pesticide is environmentally friendly, may not have hazardous effects to the users and is locally available in our country; therefore, it can be inaffordable even by resource poor peasants. Based on preliminary results obtained in this study, further intensive and long-term research on the efficacy of C. spathulata the biology of bean bruchids is recommended.