Abstract
Acaricidal field experiments were carried out and the results compared with simultaneously conducted laboratory experiments on the same mite strains. Two tetranychid mite species occurring on Egyptian cotton, Tetranychus arabicus Attiah and T. cucurbitacearum Sayed, were investigated. Population counts on the experimental sites over the 1969–70 seasons demonstrated that at the northern sites of Behera (western Delta) and Dakahlia (eastern Delta) the red species T. cucurbitacearum was dominant, whereas in the south, the green species T. arabicus prevailed. Significant differences between treatments in field experiments corresponded to differences in LC50 of ca. 7 × in the laboratory experiments using the slide-dip technique. Under conditions of high resistance towards OP and chlorinated hydrocarbon acaricides, chlordimeform was the most effective acaricide.
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