摘新梢防治梨木虱效果好梨木虱是梨树上主要害虫之一。在砀山梨区每年发生５～６代，其中以２～３代若虫危害最重，常造成落叶。对梨木虱的防治一般采用药物防治，用药次数每年多达９次以上。造成害虫抗药性增强，天敌大量被杀，使害虫更加猖獗，还增加了对环境的污染，也... Pick a new shoot pear pear lice prevention and control is good pear lice is one of the major pests on the pear. In the Yamanashi district occurs 5 to 6 generations a year, of which 2 to 3 generations of nymphs most damaging, often resulting in deciduous. Prevention and treatment of pear psylla commonly used drug prevention and treatment, medication times as many as 9 times per year. Resulting in enhanced pest resistance, a large number of natural enemies were killed, making pests more rampant, but also increased the pollution of the environment, but also ...