Nowadays, when spring farming is busy, various pests and diseases are frequent. Therefore, many farmers choose high-efficiency insecticides to kill insects. How can pesticides be used to achieve the best results? Use pesticides to control crop pests. The best insecticidal effect, in addition to the selection of the right medicine, appropriate medication, should also pay special attention to the time and location of medication. Let's take a look at it.
How to use pesticides to get the best results
First, according to the characteristics of the climate and the law of day and night activities of pests, choose to apply the medicine at a favorable time.
The time for applying the pesticide is preferably from 9 to 10 am and after 4 pm. Because after 9:00 am, the dew on the crop leaves has dried up, and it is the time when the sunrise pest activity is the most popular.
At this time, the application of the drug will not affect the control effect due to the dew dilution of the liquid, and it can directly contact the pests with the pesticides , increasing the chance of poisoning the pests.
After 4 pm, the sun is westward, the light is weakened, the temperature is lowered, and it is the time when the flying activities and the night-time pests are about to be dispatched at dusk. At this time, the medicine can be applied to the crops in advance.
The pests are exposed to venom or feeding poisoning when they come out at dusk and at night, or they can avoid poisoning loss and photolysis failure.
Second, according to the pest's hazardous parts, choose different medicines and adopt different application methods to deliver medicines in place.
For pests that damage the roots, the agent is applied to the roots or applied to the seeding ditch; the pests that feed on the back of the leaves spray the liquid on the opposite side of the leaves.
Control the red bollworm and cotton bollworm to the medicine to the flower buds, the green bells and the group tips; to prevent the aphids from causing the dead seedlings to smear the soil; to prevent the white spikes from spraying or pouring.
The control of rice planthopper and rice leafhopper will spray the liquid to the base of the rice plant; the control of Spodoptera litura will spray the liquid onto the flower buds and young pods.
In addition, for the concealed pests such as cotton aphid, red spider, rice planthopper, and rice leafhopper, according to the feeding method of the sucking mouthparts, other parts of the plant can be absorbed after the insecticide is absorbed by the systemic strong insecticide. , to achieve the purpose of delivering drugs in place.
Only when the insects are applied and the medicine is delivered in place, can the hits be hit, and the effect of removing the medicine to the insects can be achieved, so that the medicine can exert the best effect and obtain the desired insecticidal effect.
Why do pesticides use less effective?
A medicinal agent often has a good insecticidal effect when it is used. However, as the dosage is continuously increased and the range of use is continuously expanded, cases of increasing drug resistance are constantly appearing.
The most prominent is esfenvalerate, which is often called "the blessing of justice" in the advertisements of the 1980s. It will soon be impossible to achieve justice, because even if it is increased by dozens or even hundreds of times Or the concentration of the drug can not kill the pests.
This is actually because pests develop resistance, which is the ability to endure the killing of most individuals in the normal population and develop them in their populations.
In fact, individuals with different degrees of sensitivity to pesticides exist in natural pest populations. The use of pesticides is actually the process by which insecticides play a selective role in insect populations.
Each time the insecticide is used, the relatively resistant individual is left behind, killing the relatively sensitive individual, and the level of resistance of the pest population is more or less increased.
It has been identified:
(1) Drug resistance is related to pests and their living habits. The life history is short, and the number of breeding algebras per year is high. The pests that have many opportunities to contact with the pharmacy, such as mites, shells, mites, mosquitoes, etc., are the most susceptible to resistant populations;
(2) A pest is resistant to a pesticide and is often resistant to other pesticides of the same type; such interactions are less likely to occur between drugs with different insecticidal mechanisms;
(3) The same pesticide is used continuously for a large number of times or a high concentration of treatment, and resistance is formed rapidly, and vice versa.
Knowing this, we can prevent or delay the rise of pest resistance through rational use of drugs.
To this end, we advocate the adoption of comprehensive prevention and control policies including breeding, promotion of resistant varieties, improvement of cultivation techniques, and development of various technologies such as biology and physics to minimize the number and dose of chemical control.
The second is to choose pesticides with different mechanisms of action, mixed use and inlaid application.
More pesticide knowledge , please pay attention to China Pesticide Network
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