The Insect Pests of Confectionery in Shimane Prefecture

Abstract

This investigation was carried out to see the damage of confectionery by insect pests in Shimane Prefecture from June in 1968 to September in 1970.
Chocolate, biscuit and caramel were put under investigation. Among them, chocolate suffered most easily, biscuit next and caramel least. The main noxious insects were Plodia interpunctella and Oryzaephilus surinamensis. Other species mattered so little. At the shop windows, confectionery seems to suffer throughout the year, the damage being most from July to September and less from November to June of next year.
Ephestia cautella and Plodia interpuntella were parasitized by Habrobracon hebetor from September to October. Sometimes Oryzaephilus was parasitized by Cephalonomia formiciformis in Number.
As for Plodia interpunctella, the sex ratio, the life of adult and the period growthwere investigated.