1. Spraying parts <br> When cotton bollworms lay eggs, they are usually produced on the top of cotton plants, on the young leaves of the top of the fruit branches, on the buds and on the leaves. The focus should be sprayed on the top of the cotton plant and on the tender tips, buds and stalks of the fruit branches.
2, spraying time <br> The hatching process of cotton bollworm is white, two days yellow, three days black, four days of hatching. The second day after hatching, the growth point was harmed, and on the fourth day, the young bud was damaged. Most of the cotton bollworms are active in the morning from 8 to 11 am and after 4 pm, and there is very little activity during the high temperature period. The appropriate period of prevention and treatment should be applied after 8 to 11 am and 4 pm after the peak of hatching until most of the eggs become black or hatched. Avoid high temperature application, high temperature application is easy to decompose, not only the operator is easy to poison, but also poor efficacy.
3, alternate medication <br> against continuous use of a pesticide, to prevent the development of resistance to drugs bollworm.
4, the concentration of the drug according to the instructions to prepare the concentration of pesticides, can not be arbitrarily increased or decreased. Increasing the concentration tends to cause phytotoxicity in cotton plants, and reducing the concentration will reduce the efficacy.
5, the amount of liquid medicine <br> If the amount of liquid is small, the cotton plant spraying unevenly, the insect treatment effect is poor. When controlling the second-generation cotton bollworm, the amount of liquid per acre should not be less than 40 kg. When controlling the third and fourth generations of cotton bollworm, the amount of liquid per acre is 80-100 kg. All the cotton plants are evenly treated and the effect is good.
Gate valve is a relatively common general-purpose valve, the use of a wide range of applications, mainly in water conservancy, metallurgy and other industries, its extensive use of performance has been recognized by the market.
Gate valve structure: gate valve is the use of the gate and seat to control the opening and closing of the valve. Gate valve mainly has a valve body, valve seat, gate, valve stem, valve cover, stuffing box, packing gland, stem nut, hand wheel and other components. Depending on the change of the relative position between the gate and the valve seat, the channel size can be changed and the channel can be cut off. In order to make the gate valve close tightly, the mating surface of the gate plate and the valve seat are ground.
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