EFFICACY OF SOME PLANT POWDERS AS COWPEA GRAIN PROTECTANT FROM INFESTATION WITH COWPEA BEETLE, CALLOSOBRUCHUS CHINENSIS L. (COLEOPTERA : BRUCHIDAE)

Document Type : Original Article

Author

Economic Entomology & Agric. Zoology Dept., Fac. Agric., Menoufia Univ., Egypt

Abstract

This work was conducted to evaluate the efficacy of seven plant powders on the biology of the cowpea beetle, Callosobruchus chinensis(L). All plant powders were tested for their repellency action and Insecticidal effect against C. chinensis .Regarding to the avoiding rate percentages, results indicated that one day after treatment, the highest percentage was 81.5 % at banana powder, while the least one was 67.6 % at fenugreek powder. The highest avoiding rates were recorded with the powders of spearmint and lemongrass resulting 61.3 % , while the least rates was recorded with fenugreek giving 32.5%, 8 days after treatments.   The highest decrease percentages in the number of laid eggs was recorded with the treatment of lantana at the first generation giving 61.4 % decreased to 41.6, 24.4 % at the second and third generations , respectively. The least decrease percentages in the number of laid eggs was recorded with the treatment of orange at the third generation giving 14.4 % while it was  30.6, % at the first and second generations .  The highest numbers of emerged adults  was appeared with banana powders recording 258, while  the lowest number was  occurred at lantana treatment recording 150.0 adults , in comparison with 471.7 adults  in control treatment . The lowest mean numbers of emerged adults along the three generations was recorded with lantana powder, followed by lemon grass treatment.  The lowest percentage of emerged females was occurred on lantana powder where the percentage of progeny was 21.3% , 29.3% for  fenugreek , 33 % for orange, 34.1 % for lemongrass , 34.7 % for lupine, 38.9 % for banana without significant differences , in comparison with 49.5 %  in control. The  highest relative protection percentages,  along  the three generations were recorded with lantana powder recording  36.1 , 64.7 and 68.2 %  for  the first , second and third generation, respectively followed by lemon grass and lupine ranging between 52.3 to 59.8 % .

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