Methods of Delaying Selection of Acaricide Resistant Strains of the European Red Mite1

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Abstract
Certain acaricides were tested on apple for three seasons as control agents for the European red mite, Panonychus ulmi (Koch), and the two-spotted spider mite, Tetranychus telarius (L,), according to three plans: (1) single acaricides alone at standard concentration in consecutive acaricidal applications; (2) two acaricides separately at standard concentration in alternate applications; (3) two acaricides mixed, with each at one-half standard concentration, in consecutive applications. In the third season of continuous use according to plan 1, the acaricides failed to control the European red mite, an indication that the use of each chemical had developed a strain of this pest resistant to it. The same acaricides continued to give a high degree of control of this pest in the third season of continuous use according to plans 2 and 3.

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