The Effect of Some Fungicides on European Red Mite Populations in Maine1

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Abstract
In trials conducted in Maine from 1958 through 1962, glyodin has exhibited an acaricidal effect on the European red mite, Panonychus ulmi (Koch). The use of various fungicides in seasonal programs, from which all insecticides but lead arsenate were excluded, resulted in substantially lower mite populations in glyodin-treated plots, in four out of five years, as compared with those in which captan dodine (n-duodeeylguanidine), Niacide A or M, and thiram were used. In the test orchard, the almost complete lack of mites and insects predatory on P. ulmi makes it unlikely that these natural control agents were responsible for the reduction in numbers of phytophagous mites observed in the glyodin treatments. Indications are that frequent applications of the fungicide are necessary to effect an appreciable reduction in the total European red mite population.

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