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Field reproduction under natural conditions and biological aspects of Tetranychus urticae under laboratory conditions at 27±1 oC & 60-74 RH% on six different host plants namely; squash, Cucurbita pepo & cucumber, Cucumis sativus (Fam. Cucurbitaceae), eggplant, Solanum melongena & tomato, Lycopersicon esculentum (Fam. Solanaceae) and bean, Phasseolus vulgaris & cowpea, Vigna sinensis (Fam. Fabaceae) were occurred and showed that, the number of eggs and moving stages were slowly increased in the beginning of season compared with that at the end. Total number was increased to reach its maximum in the middle of June, then sharply declined thereafter. Cowpea and bean which belonged to family Fabaceae were considered the least preferred host plants due to little reproduction in the field and a few eggs laid were evident under lab. conditions. In general, the ability of T.urticae for plant infestation was deferred according to morphological shape of plant leaves which assist to protect different stages of T.urticae against environmental factors. So, squash plant considered the suitable plants for T. urticae reproduction due to trichomes, spin , gaps and large area of leaves followed by cucumber, eggplant, tomato, bean and cowpea. Cowpea plants was the best host for infestation tolerance because of smoothly and thickness of leaves. Significant positive correlation between population of T. urticae and temp. and insignificat negative with RH% were evident.

Influence of some Host Plants on Reproduction and Biological Aspects of Two Spotted Spider Mite Tetranychus urticae (Koch)