Occurrence and control of leafy vegetable worms

The main locusts on leafy vegetables are peach aphid, radish sprouts, cabbage sprouts, and lettuce tubers. Among them, the most widespread occurrence of peach aphid, in addition to cruciferous vegetables, but also harm spinach, pepper, eggplant and so on. Radish is more harmful to the surface of less waxy varieties, such as radish, cabbage and so on. Bletilla esculenta has a smooth, waxy cabbage and broccoli with a partial eclipse, and clusters of leaves on cool days. Lettuce refers to a red tube that damages lettuce and is easily recognizable. The locusts reproduce rapidly, and can occur for more than 40 generations each year. When conditions are suitable, it can be completed in 4 to 5 days. If farmers neglect their prevention and control, they are prone to flooding, and transmission of virus diseases causes a reduction in vegetables. The difficulty in prevention and control is that the worm body is small, it is not easy to be found in the early stage, and it is resistant to many drugs. Prevention and control of locusts in large-scale production should be carried out several points:

(1) Pay attention to field observations and take precautions to prevent and treat the disease before peak occurrence. Spray pesticides to be evenly moistened, pay attention to the back of the leaves, spray once every 5 to 7 days, and spray 2 or 3 times, each separated by 5 to 7 days.

(2) Select agents that have good systemic absorption and both contact and fumigation, such as 25% to 2,000 to 3000 times, 10% to imidacloprid to 3000 to 4000 times, 15% to osmotic to 2000 times, 3 %Mobipro 3000 times, 19% Kebu 2000~2500 times, 50% Pipa 1500 times.

(3) Covering the silver-gray gauze, covering the planted or field-suspended silver-gray plastic film strips with silver-gray mulches, which can repel the invasion of the winged gills.

(4) Remove the weeds in the fields and weeds in neighboring fields and reduce the invasive insect sources.

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