Autumn (from September to October) is the peak period of damage to cabbage caterpillars. Attention should be paid to prevention and control.
1. Agricultural control The timely removal of old branches and leaves, and deep soiling, is an effective measure to reduce the density of insect population and reduce the incidence of the next generation of insects. Avoid cruciferous vegetables as much as possible. The use of early maturing varieties, combined with mulching, early spring cabbage, broccoli colonization, early harvest, you can avoid the second generation larvae damage.
2. Biological control spraying of Bacillus thuringiensis, such as domestic cabbage caterpillar liquid No. 6 or 500 to 1000 times Bt emulsion, can cause cabbage worm infection and death. Biological control does not pollute the environment and has low costs without harming natural enemies.
3. Physiological control uses insect growth regulators to inhibit the synthesis of insect chitin. 20% Diflubenzuron No. 1 or 25% diflubenzuron No. 3 rubber suspension 500 to 1000 times can be used. However, the effect of diflubenzuron is slow, so spray it a few days earlier.
4. Use live insects to catch live insects from the field to capture or collect dead cabbage caterpillar 100 grams, crushed and let it rot, add 200 ml of water, soak for 24 hours, filter out worm fluid, and then 40 kg of water, and add washing powder 50 grams after mixing and spray.
5. Control of plant leachate The use of fresh buckwheat leaves, fresh red pepper, fresh cucumber vines, etc., plus a little water smashed, filtered residue, sprayed with sap and water.
6. Chemicals can be used to control 40% chrysanthemum EC, or 10% cypermethrin EC, or 50% phoxim EC, or 10% Uranus EC, or 2.5% kungfu EC, or 20% FC, or 21% extinction Kill EC, etc., according to the instructions to prepare the liquid, spray once every 10 to 15 days, and then spray 2 to 3 times.
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