A Granulosis Virus of Pieris rapae1 as a Microbial Control Agent on Cabbage in Missouri 3

Abstract

A granulosis virus (GV) was introduced, propagated, and applied to spring-produced cabbage in Missouri to control natural populations of Pieris rapae (L.). The LC ₅₀ of the GV, based on a 96-h exposure period (in the laboratory) was 1.0 capsule/mm ² . Replicated field tests demonstrated that GV reduced damage to the leaves and heads when it was applied at rates of 10 ¹¹ capsules/acre or greater. Activated carbon provided significant protection against sunlight.