Abstract
Laboratory and field experiments have shown that an apple fruit is sensitive to mirid attack from the beginning of flowering until stem hollow formation. All postembryonic life stages of Psallus ambiguus Fall. make feeding punctures on the apple cultivar Glockenapfel. The punctures are distributed among the fruits according to a negative binomial model. The number of damaged fruits is related to the density of P. ambiguus. A statistical analysis has shown, however, that the relationship cannot yet be used for establishing a reliable action threshold for mirid control because the random and systematic errors of mirid sampling obscure the more precise relationship between mirid activity and observed damage.
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