Predation of Typhlodromus (A.) fallacis on the European Red Mite as Measured by the Insecticidal Check Method123

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Abstract
Chemical exclusion of Typhlodromus (A.) fallacis (Garman), from apple foliage with carbaryl or DDT resulted in the occurrence of significantly higher densities of Panonychus ulmi (Koch) than were observed on trees treated with azinphosmethyl, dieldrin, or the control, where the predator was allowed to survive. Lack of significant differences among the population means of either predator or prey in the 3 last mentioned plots indicated that no other insect or mite predator was involved. A major factor responsible for the decline of P.ulmi populations in the control, azinphosmethyl, and dieldrin plots was predation by T. fallacis. Low populations of Tetranychus urticate Koch responded in a ditferent manner, a significantly greater number occurring only in the carbaryl plot.

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