Twolined Chestnut Borer: Effects of Storage Conditions, Processing, and Insecticides on its Survival in Oak Logs1

Experiments were conducted in 1972 and 1973 to assess the effects of storage conditions, processing, and insecticides on survival of different stages of Agrilus bilineatus (Weber) in oak logs. Survival of overwintered insects in logs stored on a rack in an open shed was 99% compared to 75% in logs stored on a rack and placed outdoors. When slabs from processed logs were piled outdoors, overwinter survival was 84% but development was delayed considerably. Approximately 70% of the insects infesting slabs in July 1973 were larvae and pupae, compared to only 13% in logs stored in an open shed. Conversion of infested slabs to woodchips resulted in no emergent adults. Adult emergence from logs treated in May with lindane chlorpyrifos, and dimethoate at the rate of 1 lb AI/100 gai of water was 5.4, 6.0, and 7.0%, respectively, compared to 94.6% adult emergence from untreated logs.