新药剂百磷３号防治梨木虱田间试验梨木虱是梨树的主要害虫之一，近年来在我市梨园普遍发生，部分园受害十分严重，有的每年喷药１５—１８次仍难以控制，尤其是鸭梨和雪花梨，叶片被害率９０％以上，有２０—３０％造成落叶。由于梨木虱主要是以若虫为害，而且若虫常处在... Pesticide Phosphorus 3, a New Phosphorus Pest Control Test Pear is one of the major pests of pears. Pear has been common in our city in recent years. Some of the harms of the parks are very serious. Some pesticides are still difficult to control 15-18 times a year. Especially pear and snow pear, the damage rate of leaves more than 90%, 20-30% caused by deciduous. Because pear lice are mainly nymphs, and nymphs are often in ...