梨茎蜂又名折梢虫,每年一代,以成虫产卵和幼虫蛀食危害新梢。在黄河故道地区大发生之年,折梢率近70 %,茌梨品种又重于酥梨。我厂生产上采取人工防治(剪除被害枝橛和捕捉成虫)外,于1984一1988年进行了化学防治的试验和示范推广,1984年对50%1605(天津产)、40%乐果、4 0 %氧化乐果 Pear stem apex, also known as pest insects, the annual generation of adult eggs and larvae spawning damage new shoots. In the area where the Yellow River occurred in the year, the rate of nearly 70%, 茌 pear varieties heavier than the pear. In 1984-1988, we conducted experiments and demonstration of chemical prevention and control in addition to artificial prevention and control of plant production (cutting off the victim branches and catching adults). In 1984, we conducted tests and demonstration projects on chemical prevention and control in 50% of 1605 (Tianjin), 40% of dimethoate, 4 0% omethoate