Prevention and control measures for pests entering safe harbors should be strengthened

At present, during the fall and winter season, the open countryside and greenhouse vegetables in the Beijing suburbs have entered the harvest period. Greenhouse nursery and production are underway. With the gradual decrease in temperature, small pests such as whitefly, leafminer, and locust, which often occur in the production of vegetables, are gradually transferred to a shelter-greenhouse, where large numbers of breeding and damage are caused. When the vegetable farmers are busy with harvesting and greenhouse production, they must take timely and effective green prevention and control measures against the characteristics of the closed and controlled greenhouses to reduce pests and ensure the safety of vegetable production.

Current pest situation

According to the investigation of vegetable pests and diseases monitoring sites in this Municipality, pests occurring in the current facility vegetables are whitefly, spotted fly and aphid. The rate of aphid mites was 68.4%, the average insect strain rate was 43.8%, and the highest was 100%; the average number of insects was 386, and the highest was 5,000; among them, whiteflies accounted for 80%-90%, with an average of 100 insects. 352 heads, up to 4500 heads. Leaf flies and aphids occur in individual greenhouses, and the number of 100 insects is 200 and 175 respectively.

Control technical points

Cultivate pest-free and strong seedlings: Weeds and stubbles are completely removed from the shed before nursery, and 22% dichlorvos smoke agent 400-500 g/mu is used to ignite fumes at 5-6 piles to eliminate the insects in the greenhouse; Separate production sheds, the best use of insect net room nursery.

Insect net barrier: autumn and winter wolfberry production greenhouses should be set in the wind at the opening of 40-50 mesh insect nets, blocking the transfer of small pests to the greenhouse, spread, reduce the damage.

Yellow plate monitoring and trapping and killing: Using the yellowishness of small pests, a yellow armyworm board is hung within a week after the planting of the vegetables to monitor the insect situation and control the insect source so that the population density is always controlled at a low level. Hang a piece every 5-7 meters and hang 20-25 pieces per acre. The yellow plate should be constantly adjusted in height as the plant grows, always keeping 10-20 centimeters above the plant, and pay attention to sticking insects and replace them in time.

Chemical control: According to the pest and insect pests, the insecticides can be used at the right time and high efficiency and low toxicity insecticides can be used. The whitefly can use 25% thiamethoxam water dispersed granules 3000-5000 times, or 25% buprofezin WP 1000 -1500 times liquid, or 20% imidacloprid solvent solvent 2000-3000 times, or 3% acetamiprid EC 1000-2000 times liquid spray, can also use 22% dichlorvos smoke agent 400-500 g/mu smoke, When the insect pests are serious, 2.5% bifenthrin EC 4000 times solution can be mixed with 25% buprofezin WP 1500 times solution. The spotted lilies can use 1.8% avermectin EC 2500-3000 times solution, or 50 times. % of cyromazine emulsifiable concentrate 4000-5000 times spray; aphids can use 5% of pyrethrin EC 1500-2000 times solution, or 1% matrine aqueous solution 800-1000 times, or 20% imidacloprid Concentrate Solvent 2500-3000 Diluent, or 3% acetamiprid EC 1000-2000 times spray. Conditional smoke control can be used at room temperature.

Clean the garden: After the harvest, the garden will be pulled in time, and the plant debris will be properly disposed of, and the empty shed will be fumigated.

Precautions

1. Insect nets, yellow plates and agents are used in coordination. After covering the net, one-time chemical control can be conducted as appropriate to kill the whitefly in the locker room. Afterwards, according to the monitoring result of the insect condition, if necessary, implement the chemical control again; it is not appropriate to suspend the yellow plate when the density of the insect population is large. Spray pesticides to kill most of the insects, and then hang yellow plates to eliminate the remaining insects.

2. Safe medication. The use of regular manufacturers, "three certificates" complete, pesticides can be used in vegetable fields; to avoid low-temperature smoked smoke on cloudy days, in order to reduce the risk of phytotoxicity; strict control of pesticide safety interval, to avoid the impact of pesticide residues on vegetable safety.

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