Shed house whitefly is hard to control

Recently, many vegetable farmers have reported that the whiteflies in the sheds are heavy. Many control measures, such as smoking and spraying, have been taken. The results are few. The reasons for careful analysis are as follows:

First, there is no real understanding of whitefly. Whitefly is a member of the order Homoptera, Pteromidae, adults, and nymphs, and it produces chlorotic spots, wilting plants, and even dead plants. It also has strong fertility, and has a large population. It damages the secretion of honey and affects the edible value of vegetables. Product value. Wing surface covered with wax powder, not easy to cement liquid. When the temperature is low in the early morning, the ability to fly is weak. After the sun goes out, the migrating force is strong when the temperature is high.

The second is that the medication time is incorrect. Most of the vegetable farmers do not use the medicine on the surface of the leaves after the sun comes out. The result is not satisfactory.

Third, the drug formula is not scientific. Many farmers believe that the more expensive the price of pesticides is, the better the effect is, or the good effect of using the instructions is good. In fact, as long as the formula is scientific, cheap drugs can also achieve good control effects.

For the occurrence of whitefly, the following prevention measures can be taken:

1. Use an insect-proof net at the air outlet to prevent adult insects from entering the greenhouse.

2. Using the characteristics of yellowish whitefly adults to hang yellow sticky board in the shed.

3. Adjust the time of medication and change to the early morning medication of the whitefly's migratory ability.

4 change the medication formula, you can choose to use the net 600 times liquid + kill 5000 times, or general strike 1000 times + 5000 times to kill the stem and leaf spray, spray every 5 to 7 days 1, alternate medication, so as not to Produce drug resistance.

5. In order to reduce the occurrence of coal contamination caused by the honeydew exudation of whitefly, it is also possible to add thiophanate-methyl 800 times solution or carbendazim 600 times solution in the control of whitefly to achieve the purpose of spraying and preventing more.

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