Abstract
Abstract Intensive sampling in commercial Concord grape vineyards in North East, Erie Co., PA, during 1971–73 revealed the presence of 61 species of Acari representing 26 families. Common predatory species collected from leaves in commercial vineyards were Neoseiulus fallacis (Garman), Amblyseius andersoni (Chant), Anystis baccarum (L.), and Zetzellia mali (Ewing). The most abundant phytophagous species collected was the European red mite (ERM), Panonychus ulmi (Koch). Populations of ERM reached peaks from early to mid-September in the absence of predatory mites. ERM populations declined after a mixed population of the predators N. fallacis and Z. mali increased to a level of 1.5 mites/leaf in late Aug.; however, the resulting foliage injury from ERM eventually caused reduced juice quality.
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