The use of pesticides to control crop pests, in order to achieve the best insecticidal effect, in addition to the selection of targeted drugs, appropriate drug use, but also should pay special attention to medication time and place.
First, according to the characteristics of climate and pests of day and night activities, choose to apply drugs at favorable times.
The pesticide application time is appropriate from 9 to 10 am and after 4 pm. Because after 9 o'clock in the morning, the dew on the leaves of the crops has dried up. It is also the time when the sunrise pests are most active.
At this time, the application of pesticides will not affect the prevention and control effect due to dew liquid, but also allow direct contact between pests and pesticides, increasing the chance of pest poisoning.
After 4 pm, when the sun goes west, the light weakens, the temperature decreases, and when the flight activities and nocturnal insects occur at dusk, the pesticide is applied at this time and the medicine can be applied to the crop in advance.
Pests are exposed to venom or feeding poisoning when they come out in the evening and at night or when they eat, and they can also avoid evaporation loss and photolysis failure.
Second, according to the harmful parts of pests, choose different agents and take different methods of drug delivery, drug delivery in place.
For pests that harm the roots, the pesticide is applied to the roots or to the sowing channel; the pests feeding on the back of the leaves spray the liquid on the opposite side of the blade.
Prevention of pink bollworm, bollworm put the drug hit the flower buds, bells and on the tip of the group; prevention and control of aphids caused by dead heart seedlings on the spread of toxic soil; prevention and control of white spike on the spray or splash pouring.
Prevention of rice planthoppers and rice leafhoppers sprayed the liquid to the base of the rice plant; Spodoptera litura was sprayed onto buds and larvae.
In addition, the hidden insects such as cotton aphid, red spider, rice planthopper, and rice leaf aphid, etc., can be selectively absorbed by insecticides with strong systemic absorption after passing through the sucking mouthparts. To achieve the purpose of drug delivery.
Only by applying insecticides and sending medicines in place can they hit the key and achieve the effect of medicines and insects, so that the medicines can exert the best effect and achieve the desired insecticidal effect.
Why is the use of insecticide more effective?
When a drug is used, the insecticidal effect is often good, but as the dosage increases and the range of use continues to expand, cases of increased drug resistance continue to emerge.
The most prominent is cis-fenvalerate, which is often referred to in the 1980's advertisement as "the blessing of righteousness." It will soon be impossible to achieve justice because even a dozen or even hundreds of thousands of doses are increased. Or the drug concentration can not kill pests.
This is actually because the pests are resistant, that is, they are able to endure the ability to kill the majority of individuals in the normal population and develop them in their populations.
In fact, individuals with different levels of susceptibility to pesticides exist in the natural pest population. The use of pesticides is actually a process in which insecticides play a selective role in insect populations.
Each time insecticides are used, relatively resistant individuals are left, killing relatively sensitive individuals, and the pest resistance levels are more or less increased.
It has now been ascertained:
(1) Drug resistance is related to pests and their habits. With a short life span, there are many breeding algebras per year, and insect pests with a high chance of exposure to pesticides, such as cockroaches, shellfish, aphids, and mosquitoes, are most likely to produce resistant populations;
(2) A pest is resistant to a pesticide, and it is also resistant to other pesticides of the same type; such interactions are not likely to occur between drugs of different insecticidal mechanisms;
(3) When the same pesticide is used for a large number of times or has a high concentration, the resistance is formed quickly, and vice versa.
Knowing this, we can prevent or postpone the rise of pest resistance through rational use of medicines.
To this end, it advocates adopting an integrated prevention and control policy that includes breeding, promotion of resistant varieties, improvement of cultivation techniques, and development of various technologies such as biology and physics, so as to minimize the number and amount of drug control.
The second is the selection of insecticides with different mechanisms of action to be mixed, wheeled and inlaid.
Third, improve the application of pesticides, such as symptomatic medication, timely spraying, selection of high-efficiency tools, spraying in place, etc., to maximize the effectiveness of the killing.
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