ABSTRACT
The McDaniel spider mite, Tetranychus mcdanieli McGregor, has occurred on apple tree foliage in the Wenatchee area of Washington State ever since such orchards were first introduced in the interior valleys of that state. Initially this phytophagous mite was not considered a major pest; light summer oils were usually enough to provide adequate control. Even when high populations did occur, they were typically late in the growing season and caused little damage. Pest status of this species was amplified by the first widespread use of DDT for codling moth control during the 1947 growing season. The framework for integrated mite control was established when Hoyt observed a case in which a predatory mite survived a codling moth chemical cover spray program. Subsequent studies resulted in a comprehensive control program integrating chemical control of insect pests with the biological control of tetranychid mites on apples.
