Crocidosema plebejana ZELLER is newly recorded from Ishigaki Is. (Okinawa Pref., Japan), where its larva is injurious to commercial okra fruits. The moth, its male and female genitalia, and the damaged fruits by the larva are illustrated, and the biology is briefly summarized.
Two Braconid species (Cotesia plutellae, Microplitis tuberculifer), two Ichneumonid species (Diadegma sp., Campoletis sp.), and one Encyrtid species (Copidosoma floridanum) of parasitic wasps of Autographa gamma and Autographa nigrisigna were found in Hokkaido, Japan
The vegetable weevil, Listroderes costirostris SCHÖNHERR, hibernates in a non-diapause state in winter and can survive in northern Japan despite regional low temperatures. For these reasons, the low-temperature tolerance of larvae and adults was determined. The supercooling points of the adults and last-instar larvae were -9.0°C and -6.7°C, respectively. All adults and 50% of tested larvae could not tolerate -10°C for 3 hours. As air temperature decreases, adults and larvae move beneath the bottom leaves in contact with the ground surface or around the stalks where temperatures are higher than in aerial parts. Their behavior for avoiding freezing temperatures may enable them to survive winter in northern Japan, although their low-temperature tolerance is poor.