Abstract
Effects of various insecticide treatment programs on tomato yield were evaluated from 1982 through 1986. Compared with results of fenvalerate applications, significant reductions in total yield and total fruit number were associated with applications of oxamyl. Significant negative regressions were obtained between percentage infestation by Lepidoptera and total fruit number, total yield, and mean fruit size. Indeterminate fresh-market cultivars produced larger fruit as the total number of fruit decreased. Determinate cultivars did not increase fruit size as total number of fruit decreased. These reductions may result from early season herbivore effects such as fruit abortion. Implications of economic injury levels for direct pests are discussed.
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