Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Seasonal distribution of the flower thrips (Frankliniella tritici) (Fitch) and onion thrips (Thrips tabaci Lindeman) (Thysanoptera: Thripidae) on safflower in eastern Montana.

Abstract

Thrips were sampled in 1984 and 1985 on safflower plants that had been planted in Montana on 3 dates in April-May. In 1984, Thrips tabaci accounted for 57% of the adults collected and Frankliniella tritici 42%; the corresponding percentages in 1985 were 52 and 44. Four other species were recorded. Regardless of planting date, T. tabaci was the first species detected; populations peaked on 12 and 5 July in the 2 years, respectively. Populations of F. tritici peaked on 2 and 8 August. It is suggested that T. tabaci overwinters in the area, whereas F. tritici does not.