Daily Sensitivity Rhythm of the Two-Spotted Spider Mite, Tetranychus urticae, to DDVP

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Science  24 Jul 1964:
Vol. 145, Issue 3630, pp. 405-406
DOI: 10.1126/science.145.3630.405


Adult females of the two-spotted spider mite (Tetranychus urticae Koch), showed a daily rhythm of sensitivity to DDVP (dimethyl 2,2-dichlorovinyl phosphate). When the mites were maintained in alternating light-dark conditions, maximum susceptibility to the chemical occurred 2 hours after dawn and the mites were least sensitive 2 hours after nightfall.