With the continuous improvement of the development of the pesticide industry, various types of products have entered the market, including many well-known herbicides, insecticides , and many new dosage forms of plant growth regulators . There are many varieties and varieties, and farmers often ignore many techniques in use and have reduced efficacy.

In this issue, we will list the precautions for the use of commonly used herbicides, insecticides, and plant growth regulators, in order to give you more results in the future.

1. How does the herbicide spray do not affect the crop?

1. Different herbicides should be selected according to different soil characteristics, microbial species, climate and irrigation conditions. The herbicide containing chlorsulfuron-methyl is mainly degraded by hydrolysis in the soil. When the field is alkaline soil, the rainfall is low in the year, and the soil is dry, the residual period in the soil is often prolonged. In the case of acid soil, soil moisture or irrigation of farmland, the residual period is shortened and the later crops are relatively safe.

2. Before planting the crops, it is necessary to know whether the herbicides applied before and after the crops have phytotoxicity to the crops. If the herbicides containing chlorsulfuron-methyl or metsulfuron-methyl components, such as wheat straw, wheat straw, etc., have been applied before, the corn, soybean, cotton, peanuts and other crops cannot be planted, and they cannot be used as polders.

3. Improve application methods and reduce soil residuals. (1) The dosage should be accurate, the spraying should be uniform, no leakage, no heavy spraying; (2) flexible use period. It can be used for soil treatment before and after planting, or for post-emergence spray; (3) Rational application. Mixing chlorsulfuron with 24-D butyl ester reduces the amount of chlorsulfuron by 50%. Pussite soil treatment can be mixed with trifluralin, acetochlor, alachlor, secazine and the like.

Second, the more harmful the insecticide effect is, the quality problem or the method is wrong?

A crop insecticide, when used, the insecticidal effect is often very good, but as the dosage continues to increase and the scope of use continues to expand, cases of increased resistance have emerged. So, what can be done to improve the effect of pesticides ?

The full growth period of timely use of pests is generally divided into adult, egg, pupa, and larvae. The eggs, mites, and mature larvae have strong resistance to drugs. Therefore, it is necessary to pay close attention to the larvae before the third age and the nymphal period, when the drug resistance is weak, it is beneficial to improve the drug effect.

Moderate medication should not be used too much or too little; second, the concentration of the drug solution should not be too high or too low. Too high will cause poisoning of humans and animals, causing phytotoxicity to crops, and low insecticidal effect.

Symptoms and pesticides, although have a variety of functions such as stomach poisoning, systemic absorption, fumigation, etc., can control a variety of pests, but for different pests, there are still different speeds, high and low, so it is necessary to use the medicine.

Do not spray pesticides at high temperature at noon. At this time, the pests are more inactive and inactive, the liquid will soon dry up, the insecticidal effect is poor, and it is easy to cause poisoning and phytotoxicity of humans and animals. It is necessary to let the syrup flow to the lower part and the pests to enhance the insecticidal effect. In addition, it is necessary to pay attention to the rotation of drugs to prevent pests from developing resistance.

Third, how to use plant growth regulators?

1. Master the correct concentration, method of use, and location of use. For example, the use of ethephon can promote the main flower of the main vine, but it must be 4 to 6 true leaves. It is easy to use early. The phytotoxicity; the use of 24-D in the solanaceous vegetables is easy to cause phytotoxicity. The prevention method is to grasp the concentration of use, and make appropriate adjustment according to the growth and temperature of the plant at the time of use.

2, first test, determine the most suitable use concentration, and then promote it in large areas. The application effect of plant growth regulators is closely related to the concentration of use. If the concentration is too low, it will not produce the desired effect; if the concentration is too high, it will destroy the normal physiological activities of plants and even damage plants.

For long-term crops, the concentration of the retardant can be higher. If it is too long or even uncontrollable, it can be applied 1 or 2 times.

For growing crops, the concentration of the retardant should be lower, once.

Long-growing crops do not delay growth, and it is not necessary to apply growth retardants.

3. Pay attention to the climatic conditions when using. The concentration of the application should be reduced in arid climate conditions; conversely, in the rainy season, the concentration should be appropriately increased. The application time should be at 10:00 am and 4:00 pm. It is not suitable for application in windy weather and when it is about to rain. Applying half or full amount of liquid medicine in case of rain 4 hours after application.

4, the use of parts and methods should be correct. When a plant growth regulator is applied, the treatment site is determined according to the purpose of administration and the principle of pharmacodynamics. If 24-D prevents falling flowers and fruit drop, it is necessary to apply the medicine on the flowers to inhibit the formation of the separation layer. If the young leaves are treated with 24-D, it will cause damage.

More pesticide knowledge , please pay attention to China Pesticide Network

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