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一、虫类：梨木虱 每年 7、 8月份不少梨园的梨树树叶、果实出现黑色污染现象，这是梨木虱所致。大约为二代。为害多在叶脉周围， 9月以后出现的虫害，防治难度较大，应选用渗透性和内吸性药物。吡虫啉 (阿克泰 )1000倍，好年冬 2000倍，阿维虫清 3000～ 8000倍喷杀防治。当年?
First, pests: pear lice annual July and August many pear orchard pear leaves, fruit black pollution phenomenon, which is caused by pear psylla. About two generations. Harm more around the veins, pests occurred after September, prevention and treatment more difficult, should be used permeability and systemic drugs. Imidacloprid (A Ketai) 1000 times, as good as 2000 times winter, Avian Insect 3000 ~ 8000 times spraying control. then?