Studies on the developments of the overwintering peach fruit moth, Carposina niponensis Walsingham.
The development of overwintering larvae of Carposina nipponensis was studied on apple in Suweon, Korea Republic. Diapause larvae leaving the fruits were first observed in late July, about 50% were in diapause in mid-August and all the larvae were in diapause in early September. Induction of diapause appeared to be connected with the time of oviposition, the earliest diapause larvae being those hatching from eggs laid in late June or July. Diapause was terminated in early December, and a cool period of about a month was required for termination; 5-10°C appeared to be the most effective temperature range for this, and temperatures below freezing inhibited reactivation. Overwintered larvae began to pupate in mid-May. Development was affected by soil temperature as well as soil humidity in the spring, and dry soil increased larval mortality.