Understanding these pesticides can save half of the money!
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.
(1) Before applying the herbicides containing chlorsulfuron-methyl or metsulfuron-methyl, such as wheat straw, wheat straw, etc., the crops such as corn, soybean, cotton, peanut, etc. cannot be planted, and they cannot be used as polders.
(2) quinclorac: It is reported that no crops can be planted except for rice within 309 days after application of quinclorac; no eggplant or tobacco can be planted within 12 months; tomatoes, carrots, umbelliferous crops cannot be planted within 2 years If carrots, celery, parsley, etc. are sensitive to quinclorac, care should be taken not to cause drifting phytotoxicity, nor to irrigate the above vegetables with water applied with quinclorac.
(3) Broad grass clear: It degrades rapidly in alkaline soil and degrades slowly in acidic soil. The sensitive crops are sugar beet, rapeseed and cotton. If these three crops are planted, they must be separated by more than 2 years.
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) The period of use should be flexible. The soil treatment can be carried out before the plant is broadcasted, before the seedlings, or after the seedlings;
(3) Rational application of drugs. 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.
Then, what can be done to improve the effect of pesticides ? The full-term growth period of the pests is generally divided into adult, egg, cockroach and larvae. The eggs, cockroaches and old larvae have strong resistance. 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 4-6 true leaf stage. It is easy to use early. The phytotoxicity; 2,4-D of the solanaceous vegetables is easy to cause phytotoxicity, and 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, it can be applied 1-2 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. For example, 2,4-D prevents the flower from falling and falling, and it is necessary to apply the agent on the flower to inhibit the formation of the separation layer. If the young leaves are treated with 2,4-D, it will cause damage.
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