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The Clerodendron infortunatum leaf powder [5,10 and 20% (w/w)] was thoroughly mixed with cow dung and fed to third instar grubs of Oryctes rhinoceros and grub and pupal mortatly, deformalities and fat body of adults in relation to reproduction was studied. Total mortality was 70%, 30% and 10% while O. rhinoceros reared with leaf powder and cowdung mixture 20%, 10% and 5%. At 5% leaf powder and cowdung, exhibited maximum survival rate, and this particular dosage was employed for rearing adult O. rhinoceros for studying the effect of C. infortunatum as a pesticide on the fat body of male coconut beetle O. rhinoceros in relation to reproduction. Observations made on fat body and testis of insect reared on plant powder and cow dung medium revealed certain morphological changes like enlarged lobes in parietal fat body, failure to form lobes in visceral fat body and reduction in size of the testis. Histological changes like disintegration of cell membrane and shrunken and scattered nucleus in the fat body cells, reduction in number and size of spermatids in testis was also observed.
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