Destroy crop pests, the use of pesticides is the most effective way, although friends of farmers often use pesticides, but for pesticides expertise but little knowledge, to follow the following Xiaobian together to understand it.
1. What are the stomach poisoning, contact killing, systemic and fumigation effects of pesticides?
The way insecticides enter the pests in some way to act on pests is generally divided into four categories: stomach toxicity, contact, systemic and fumigation:
1. Stomach poisoning means that the insecticide is sprayed on the crop or mixed in the seed or bait. When the pest is fed, the insecticide enters the digestive tract of the pest along with the food, and is absorbed into the nerve and muscle through the hemolymph after being absorbed. The way in which various organizations produce poisoning effects.
2. Contact killing means that the insecticide is sprayed onto the insect or on the surface of the plant or in the habitat. After the pest is exposed to the insecticide, the insecticide passes through the epidermis or sensory organs of the pest, and even the valve enters the worm, and then spreads to the nerve through the hemolymph circulation. Targets such as muscles or glands, which cause the death of pests.
3, systemic action refers to an insecticide can be absorbed by the roots, stems, leaves and other tissues of plants, killing the way of eating and drinking pests.
4, fumigation effect refers to some agents are easy to volatilize to form a gas, through the insect valve into the respiratory system, and then spread to the various parts of the insect body, eventually leading to the phenomenon of pest poisoning death.
Second, what is the difference between systemic and invasive effects?
The systemic action of the drug means that the drug can be absorbed into the body by the crop, regardless of the part of the crop, and is transported to all parts of the plant as the body fluid is transferred to the crop; The amount of the drug is enough to cause the poisoning of the pests in this part to die, and the medicament does not hinder the growth and development of the crop. Agents with systemic conductivity are referred to as systemic insecticides.
The infiltration of the agent means that the agent can only penetrate the epidermis of the crop and cannot be conducted in the body of the crop. The site of the drug can kill the pest, while the part without the drug has no effect.
3. What is the toxicity of pesticide selection?
The selective toxicity of an insecticide refers to the difference in toxicity between a target agent and a target organism or a non-target organism or a different pest. Agents with significant selective toxicity are referred to as selective insecticides.
4. What are the pesticide application methods?
There are many methods for applying insecticides, such as spraying, dusting, withdrawal, seed dressing, pouring, soaking, fumigation, and the like. Depending on the type of pest, the application technique is different, and underground pests can choose seed dressing, poison bait, poisonous soil and other methods.
5. What are the measures to prevent and control the development of resistance to pests?
When pests become resistant to insecticides, do not arbitrarily increase the amount of drug use. We can prevent and delay the development of drug resistance through the following ways:
(1) Make full use of comprehensive prevention and control technology, take the guidance of China's “prevention first, comprehensive prevention†plant protection policy, and make full use of agricultural, biological, physical, chemical, and even artificial all effective ecological measures to prevent insects. .
(2) Regularly and alternately use pesticides during the use of pesticides.
(3) By taking mixed drugs, two or more kinds of agents with different action mechanisms and different modes of action can greatly reduce the rate of resistance of pests.
(4) Reduce the dosage of the drug, reduce the number of medications, and lengthen the interval between medications.
(5) Use more selective pesticides and less pesticides with long residual periods.
(6) The use of synergists, synergists used in insecticides, can reduce the dose, enhance the effect, and delay the resistance.
(7) The sensitive period of pests is the key point of application, so it is necessary to select the sensitive period of pesticide application.
6. What is the best time to control pests?
When controlling pests, it is best to apply the medicine at a young age before the age of 3, when the control effect is the best, because at the young age, the body wall of the pest is relatively thin, small, small in food consumption, light in harm, and small in activity. The drug resistance is weak, and the amount of fat in the aged larvae increases, and the organophosphorus pesticide has a decomposition effect. The higher the fat content, the stronger the drug resistance is. It can be seen that mastering the timely application of pests in young age is a key factor to improve the control effect.
Today, the knowledge about pesticides is introduced here. To get more knowledge about pesticides , please pay attention to China Pesticide Network.
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