Control methods of rape aphids

(Agriculture rich network) 1, chemical control. Aphids were found in 10% of plants at seedling stage, 1 to 2 aphids per plant, aphids in 10% of stems and branches at bolting and flowering stage, and 3 to 5 aphids per branch. Usually 2 to 4 times. 2. Yellow plate traps aphids. After sowing in autumn, yellow plates are arranged at the edge of rape field. The method is to use 0.33 square meters of plastic film, paint it golden yellow, and then coat a layer of vaseline or engine oil. The frame is 0.5 meters above the ground, which can trap and kill a large number of wing aphids. 3. Biological control. It is necessary to protect natural enemies. Aphids, green flies, aphids and ladybugs are important natural enemies of aphids.