Aphid, the scientific name leeks, is a major underground pest in the production of leeks. It occurs in all regions of Fujian Province. It usually takes 4 generations a year. It occurs in early May, early June, early August and late September. Adults lay eggs under the earth seams or clods around the alfalfa. After the larvae hatch, they are trapped in the bulbs and tender stems of the leeks, causing the young stems to rot and the yellow leaves of the leeks to rot and die. The death of whole leeks caused great impact on the yield and quality of leeks. Now is the crucial period for the prevention and control of cockroaches in the fall. Here are the technical points for preventing cockroaches in the fall.
In September, it is the peak period of occurrence and damage of exposed mantle. It can use 20% plutonium to protect EC, generally 1 kilogram of mu, dilute the agent into 100 to 200 times liquid, apply water after irrigating, or use 50% octyl sulfide. Phosphorus 0.75 to 1 kg is poured into the field with water, and it is generally preferable to use it before and after evening. For the protection of greenhouses, greenhouses and other places must be controlled before the shed, along the ridge ditch, usually a depth of 3 to 4 cm, and then 50% of phoxim EC 500 to 600 times Irrigation root.
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