Effect of low temperature on survival of immatures of the parasite Venturia canescens (Gravenhorst) (Hymenoptera: Ichneumonidae)

Survival of immatures of the parasite Venturia canescens (Gravenhorst) was adversely affected by temperatures of 0°, 5°, and 10°C but were only minimally affected at 15°C. At 0°C the decline in V. canescens emergence over time was rapid and by 96 hr emergence had virtually stopped. At 5° and 10°C the decline in emergence was more gradual, with emergence essentially stopped by 216 hr. Parasite fecundity was unaffected by larval exposure at 5°C.