Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Evaluation of a virus-insecticide combination for cotton pest control in Togo.

Abstract

A low dose of cypermethrin combined with Mamestra brassicae virus (Mamestrin) was applied weekly against Helicoverpa armigera and Diparopsis watersi in smallholder cotton plots in northern Togo in 1989 and 1990. The timing of treatments was based on action thresholds. One or two additional sprays of Bacillus thuringiensis (Foray 48B) were applied to control Syllepte derogata, or dimethoate to control aphids. No significant yield differences were observed between the plots treated with the pyrethroid-virus combination and the control plots, treated with the recommended insecticide schedule. However, the latter had a significantly higher percentage of healthy bolls. The virus applied was not re-isolated from insects collected in the field.