Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Losses in yield of cotton due to insects.

Abstract

Estimates are made of losses in cotton yield in the USA due to insect pests despite using the best agricultural practices and compared with losses calculated from studies that included control and treated plots. Anthonomus grandis, Heliothis zea and H. virescens have been the predominant pests during this century and account for the greatest losses. Losses caused by pests when controlled and not controlled were calculated as 8 and 19%, respectively, for Aphis spp., 21 and 51% for Anthonomus grandis, 30 and 92% for Trichoplusia ni, 12 and 34% for Pseudatomoscelis seriatus [Psallus seriatus], 15 and 63% for Heliothis spp., 9 and 61% for Pectinophora gossypiella and 0.05 and 21% for Tetranychus spp. The amount of loss due to insects is dynamic. Such losses vary from year to year and from area to area and have not decreased appreciably over the past 30 years. Thus, the advances in insect control technology made during this period have made it possible to protect the cotton crop from greater losses, while yields have increased significantly and production practices have changed dramatically.