Epitrimerus pyri(Nalepa)is newly found as a species of pest damaging pearseriously. The adult and nymph mites absorb the juice from both sides of the main veins onthe back of leaves. Reproduction is by means of laging eggs individually and exposedly.Most of eggs are laid on the both sides of the main veins on the back of leaves. In the middleseptember, the adults begin to hibernete in soil or in the fissure of bark of trunk. The periodof hibernation is for about 2l0 days. The adults appear early and middle April. Since then,the mites will do harm to pear for about l50 days. During a year, two ...
