Abstract
Seasonal population dynamics of tobacco thrips, Frankliniella fusca and western flower thrips (WFT) were investigated in peanut, Arachis hypogaea L., planted at various times from 1 April–12 June in six different years. Populations of adult and larval thrips were sampled in whole seedling plants, vegetative terminal buds and flowers. The primary species reproducing was determined indirectly by collecting larvae from whole plants, terminals and flowers and rearing them to adult for identification. Of 875 larvae, 486 survived to become adults (484 were F. fusca and 2 WFT). Peak populations of F. fusca adults occurred in whole plants and vegetative terminal buds ≈ 10 – 20 d after planting in April. Peaks of WFT adults occurred ≈ 12–14 d after planting in May. Maximum feeding injury occurred ≈ 28–35 d after planting and coincided with peak numbers of thrips larvae rather than populations of either F. fusca or WFT in whole plants or terminal buds. Populations of brachypterous F. fusca generally increased to a peak in the flowers at 30–60 d after planting. Populations then declined to low levels during the late summer.
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