Ecology, Environment and Conservation Paper

Vol 24, Issue 4 2018; Page No.(1642-1646)

THE PREDATION EFFICACY OF COCCINELLA SEPTEMPUNCTATA L. (COCCINELLIDAE: COLEOPTERA) AGAINST COTTON APHID APHIS GOSSYPII GLOVER (HOMOPTERA: APHIDIDAE)

Ali K.R. Al-Shujairi and Sindab S.J. Al-Dahwy

Abstract

Several laboratory experiments were undertaken to investigate the feeding efficacy of the predator Coccinella septempunctata L. on different stages of Aphis gossypii Glover reared on summer squash. Results indicated that the predator larvae consumed an average of656.1 and 464.0 individuals of aphid nymphs and adults when fed on each alone. The consumption rates of nymphs and adults by the female predator adults were, 3682.5 and2592.5 individuals respectively. However the number of preys varied according to the development stage of female life span. Consumption rate was higher during oviposition period compared to pre and post-oviposition periods. Male consumption was lower than that of the female. The mean numbers of aphid nymphs and adults consumed during the life span of male were 1904.4 and 1326.5 individuals/male respectively.

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