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 most conducive to the occurrence of rapeseed is the dry weather at 16-25 °C. The occurrence of early autumn and late spring in Jiangyan District is more serious and less in winter and summer. When the nutrient conditions are good and the density is low, the wingless crickets are dominant, but the population density is large, and when the malnutrition occurs, a large number of winged maggots are generated and spread. 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 aphids in large-scale production should be carried out several points: (1) pay attention to field observations, and pay close attention to early prevention and treatment before peak occurrence. Spray pesticides to be evenly moist, pay attention to the back of the leaves, spray 5 to 7 days, and spray 2 to 3 times, each separated by 5 to 7 days. (2) Select agents that have good systemic absorption and have both contact and fumigation effects, such as 25% banned from 2000 to 3000 times fluid, 10% imidacloprid 3,000 to 4000 times fluid, 15% osmium chloride 2000 times fluid, 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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ULPA-01

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