Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Insecticides for the control of apple blossom thrips.

Abstract

Ten insecticides were tested against apple blossom thrips (Taeniothrips spp., Thrips flavus and T. carthami) at their normal recommended dosages. Their effect on pollen viability and fruit set was also observed. Fenitrothion (0.05%) followed by isofenphos (0.1%), methamidophos (0.05%) and fenvalerate (0.01%) were found effective against the thrips, without any long-lasting effect on pollen viability. Fruit set on insecticide-treated trees varied from 9.8 to 14.6% against 7.2 on untreated (water-sprayed) trees. In view of safety to pollinators, isofenphos is considered the best product for controlling the thrips.