我所有18年生南丰密桔44株,1982年和1983年6—7月各喷施了一次40％乐果乳剂800倍液防治害虫,发现喷药后2—3天桔树开始落叶落果,7天后大量叶、果脱落,据初步观察,落叶落果严重的高达50％以上。脱落的叶片、幼果呈暗绿色或黄绿色。 为了验证上述情况,我们于1984年7月重复进 I have all 18-year-old Nanfeng Clementine 44, 1982 and 1983 June-July each spraying a 40% dimethoate 800 times liquid pest control and found 2-3 days after spraying orange deciduous trees, After 7 days a large number of leaves, fruit fall off, according to preliminary observation, deciduous fruit drop serious as high as 50%. Leaves off, young fruit was dark green or yellow-green. In order to verify the above, we repeated in July 1984