Biological and ecological studies on Scymnus syriacus and Scymnus levaillanti (Coleoptera: Coccinellidae)
2006
Allawi, T.F.(University of Jordan, Amman (Jordan). Plant Protection Dept.) E-mail:[email protected]
Both Scymnus syriacus and Scymnus levaillanti are aphidophagous coccinellids. In the laboratory they consumed and successfully reproduced on several species of aphids. Larvae suck the prey contents from aphid appendages, whereas adults consume the whole aphid, except for parts of the appendages. Extra-oral digestion is practiced during feeding. The mean number of aphids consumed by the larval stage of S. syriacus when reared at 25 deg C was 95, and 130 aphids at 30 deg C. For S. levaillanti it was 125 and 139 aphids at 25 deg C and 30 deg C, respectively. The mean number of eggs deposited daily by S. syriacus for the first three weeks of adult life was 19.5, with a range of 3-30 eggs at 25 deg C. Longevity of adults ranged from 3 to 4 months at 25 deg C and 2.5-3 months at 30 deg C.
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