一造成棉蚜虫大量繁殖的原因今年河南全省除棉蚜大量发生外,在高粱上、芝麻上、(?)豆上、花生上、烟草上、各种瓜类上以及幼嫩的树条上,均有大量蚜虫发生。今仅就适合棉蚜今年发生的条件略述如下:1.本年气候特殊:今年在植棉期间正值天气亢旱,政府号召抗早点种,因点种的深度较一般播种者为深,又值土壤干燥,出苗较迟,而出苗后又逢高湿,晚播种的在播 A cotton sprout caused by a large number of breeding reasons this year in addition to cotton aphid in Henan Province occurred in large numbers, the sorghum, sesame seeds, (?) Beans, peanuts, tobacco, all kinds of melons and young trees on , A large number of aphids occurred. The current conditions for this year’s cotton aphid are as follows: 1. This year has a special climate: during the cotton planting period this year, when the weather is hot and dry, the government calls for an earlier resumption of planting because the depth of the planting is deeper than that of the general seeding plant. The value of soil dry, late emergence, and after ramming wet ramie, sown late in the broadcast