Invasive Species Compendium

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Abstract

The role of cocoons in overwintering of the soybean pod borer Leguminivora glycinivorella (Lepidoptera: Tortricidae).

Abstract

Mature overwintering larvae of the soyabean pest Leguminivora glycinivorella in Japan were found to be susceptible to freezing, their supercooling points being from -22 to -24°C for spontaneous freezing and from -3 to -4°C for inoculative freezing. Cocoons did not effectively insulate the larvae within from temperature decreases but could prevent ice inoculation from the exterior owing to their low water permeability. Since winter temperatures in Japan seldom fell below -20°C, and larvae in submerged cocoons survived for at least 5 weeks, the cocoons effectively protected L. glycinivorella both from low winter temperatures and from early spring flooding and permitted 67-85% survival of overwintering larvae.