In recent years, black peony (root locust) has been damaged by garlic and scallions. The underground roots are very serious. In the autumn, garlic and onions are most seriously damaged. When the roots of garlic and onions are covered with black peony roots, garlic and onions are rotted. Seedlings, but the use of drugs at this time is very poor. Prevention and control of garlic and onion root blackheads, from the time of planting, the eggs and larvae will kill, have good results.
Control methods: When growing garlic and onions in autumn and winter, spread 3-5 mg chlorpyrifos granules, or 5% avermectin granules, or 5% diazinon granules per acre to dig wells for planting. After sowing garlic seed or planting onion seedlings, spread it evenly around the roots of garlic seedlings or onion shoots. In addition, when the garlic and onion seedlings are about 15 to 20 cm high, every 15 to 20 days, the roots are applied 1500 times 5% avermectin EC, 1500 times 48% chlorpyrifos EC, and continuously applied for 2 to 3 times. Every time, 8 to 10 kilograms of stalks are applied per square meter of vegetable field, and they are evenly applied to the soil around the roots of garlic sprouts and onion shoots. It is advisable to completely infiltrate into the soil without flowing through the soil.
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