Effects of Temperature on Insecticidal Activity of an Entomopathogenic Nematode, Steinernema kushidai (Nematoda: Steinernematidae), against Anomala cuprea (Coleoptera: Scarabaeidae) Larvae.

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Insecticidal activity of Steinernema kushidai against Anomala cuprea larvae, feeding activity of A. cuprea larvae, survival of S. kushidai infective juveniles (J<SUB>III</SUB>) and qualitative changes of the symbiotic bacteria were examined under six different temperature conditions (10-35°C at 5°C intervals). Mortality of A. cuprea larvae was 95, 100 and 85% at 20, 25 and 30°C, respectively, but significantly lower at 10, 15 and 35°C. Feeding amount of Quercus acutissima leaves by the 3rd instar larvae was significantly greater at 20, 25 and 30°C. Survival rate of J<SUB>III</SUB> in water suspension was significantly higher at 10, 15 20 and 25°C and that in soil was also higher at 10, 15, 20, 25 and 30°C, respectively. The color of colonies and antibiotic characters in relation to insecticidal activity of symbiotic bacteria were not influenced by the temperature conditions during 10 and 35°C.
日本応用動物昆虫学会の論文