Abstract
Onion thrips, Thrips tabaci Lindeman (Thysanoptera: Thripidae), is a major pest of greenhouse crops in Iran. It is one of the major limiting factors affecting yield of cucumber. A study on the biology of this pest was carried out in laboratory condition (25±1°C, 70±5% RH and 16:8 h (L: D) photoperiod) on cucumber (var. Soltan) in 2007. This survey showed that T. tabaci completed the life cycle from 18 to 21 days. Duration of life cycle including egg, L 1 , L 2 , prepupa, pupa and adult was 2.82±1.33, 1.95±1.42, 4.12±0.92, 1.03±1.44, 1.97±0.91 and 14.4±3.13 days. Females could produce about 26.82±5.56 eggs. Thrips sex ratio progeny revealed no presence of males, since only females emerged. Knowledge on the biology of this insect pest would contribute to a better understanding of the relation- ships between the crop and the environment, and knowledge on this insect pest biology would allow establishing control strategies in a future integrated pest management program (IPM).
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