Population Dynamics Of Thrips Research Articles

Predicting Resurgence of Western Flower Thrips (Thysanoptera: Thripidae) on Onions After Insecticide Application in the Texas High Plains

Population resurgence of western flower thrips, Frankliniella occidentalis (Pergande), was observed on onions after insecticide application during two growing seasons on the Texas High Plains. Regression models were used to quantify variables influencing western flower thrips population dynamics. Thrips densities increased exponentially after being sprayed with insecticide. This resurgence was aided by degree-days (DD) between thresholds of 5 and 35°C accumulated after insecticide application, whereas accumulated DD above a threshold of 35°C greatly hindered increase. Density of western flower thrips on onions was predicted by DD and rainfall accumulations.

Pollination potential of thrips (Insecta: Thysanoptera) in some Solanaceous plants

Pollination by two species of flower thrips in six Solanaceous plants (four perennials and two seasonal) were studied. The results highlight the role of thrips in both self and cross pollination of these flowers. The findings also suggest that in view of the stigmatic surface in all the flowers being at a higher level than the anthers, there is more entomophily. Data relating to the population dynamics of thrips as well as the pollen load of thrips are also included.