The occurrence and control of rapeseed meal
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Dishes are also known as borers, cockroaches, carrots and so on. The main hazards are radish, Chinese cabbage, and broccoli, among which the autumn radish is the most affected. Larvae are borers, which mainly damage the heart and growth points of the seedlings. After the growth point of the plant was killed, it stopped growing, resulting in the lack of seedlings and ridges. Cabbage and radish vegetable crops suffered the most from 3 to 4 true leaves. First, the occurrence of the law of the pod occurs in Shandong and Henan Provinces, which last 3 to 4 generations per year. The old larvae are conjugated to soil, and the knots in the leaves are overwintering. After the spring of the next year, the larvae grow in soils 6 to 10 cm deep.蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹Adults grow into nighttime, and on the back of the leaves during the day and at night, many eggs are produced on the heart of the seedlings. The newly hatched larvae feed on the leaf flesh, and they begin to drill into the cabbage leaves after 3rd instar, and feed on the bases, stems and roots of the heart. A larva can endanger 4 to 5 seedlings in a lifetime. After mature, in the soil near the heart of the leaf or the vegetable root, the soil is fused in the earth seam. High temperature and low humidity are conducive to the occurrence of rapeseed meal. When the 2 to 4 leaf stage of the seedlings meets with the larval stage, the damage is serious. Second, prevention and control measures 1, agricultural control According to the larval stage, the appropriate adjustment of the sowing date, so that the seedlings 2 to 4 leaf stage and vegetable larvae occur at the staggered period; combined with seedlings, Dingmiao and other agricultural activities, remove pests, kill pests; In dry years, irrigation will be done sooner or later to increase the humidity in the field and change the microclimate in the field that is suitable for rapeseed meal. 2, chemical control from the seedlings pull the cross-phase began spraying, sprayed every 5 to 7 days once, continuous spray 2 to 3 times, the liquid spray focused on the heart. Pharmacy can use 10% to remove 1500-2000 times of suspension agent, 50% of phoxim EC 1000 times, 80% of dichlorvos EC 1000 times, 50% of diazinon EC 1000 times, 20% of cypermethrin EC 3000 times liquid, 20% swept lecithin 2000 times or 2.5% deltamethrin 3000 times.