2015•Journal of the Advances in Agricultural Researches/Journal of the Advances in Agricultural Researches Open access
Influence of Temperature and Host Plants on The Development of The Two-spotted Spider Mite, Tetranychus urticae Koch (Acari: Tetranychidae)
M. Z. Embarak, Alaa Eldin Ahmed Salem, Ayman Abou ElSaad
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Abstract
Duration of immature stages of the two-spotted spider mite, Tetranychus urticae Koch, reared on eggplant leaves at constant temperatures of 21, 25 and 29°C was determined. Developmental threshold of the immature stages was 10.4°C. The mean number of degree- days required by T. urticae to complete its development was 133.5 DD. The total mortality from egg to adult emergence was 32.14, 26.8 and 30.36% at 21, 25 and 29°C, respectively. Moreover, the greatest mortality occurred during the egg stage. Regarding host plant involved, T. urticae developed faster on peanut, Arachis hypogae L. (8.08 days), followed by cucumber, Cucumis sativus L. (9.31 days) and eggplant, Solanum melongena L. (9.37 days). These results indicated that the temperature and host plant affected the development time of T. urticae.
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