Selected Effects of Sublethal Dosages of Three Insecticides on the Bagworm

Abstract

A survey was made under field conditions of the effects of sublethal dosage by ingestion of bagworm larvae, Thyridopteryx ephemeraeformis placed on diazinon, carbaryl, or toxaphene treated juniper. Low dosage ingestion did not affect survival, egg number, pupation duration, or emergence patterns. Test populations on diazinon treated trees completed development through the pupation stage in significantly higher numbers. Treatments with toxaphene resulted in significantly larger egg size but treatment with carbaryl produced a significant decrease in egg size.