It is said that the farmers' friends are very clear about how to fight drugs, and they can't miss the spray, re-spray and so on. However, there will still be cases where pests and diseases cannot be prevented and drugs are used. Is it true that you will fight drugs? Cai Xiaomei shared the 9 tips on how to fight drugs today, maybe I missed that!
Before the fight
1. Reduce the source of pests and diseases
Clean up diseased leaves, diseased branches, diseased fruits and even diseased plants (the source of infection of most diseases), and take out the incineration treatment outside the field, the effect of fighting drugs will naturally be better.
2, choose the time to fight drugs
1) Determine according to temperature changes
Whether it is plants, pests or germs, they all have a suitable activity temperature, about 20-30 ° C, 25 ° C is best, then fight drugs, not only for the crop is safe, for the active period of the pests and diseases will also have effect.
For high temperature weather, it should be taken before 10:00 am and after 4 pm.
In case of cool weather, it should be taken after 10 am and before 2 pm.
For example, in the greenhouse in winter and spring, it is best to fight drugs in the morning of warm weather.
2) Determine according to humidity changes
The deposition of the liquid from the pests and diseases to the unfolding of the film will be affected in many ways, and the humidity of the air will be greatly affected.
If the humidity of the air is too high, the deposited liquid will become larger droplets, and then under the influence of gravity, it will deposit on the lower part of the plant, thereby causing phytotoxicity.
If the humidity of the air is too small, the liquid will evaporate easily, resulting in less exposure to the target, thereby reducing the efficacy, and severe burning lesions.
Therefore, the fight drug environment should be kept ventilated.
For open vegetables. Some leaves and branches of the plant can be properly trimmed to keep the field ventilated and ventilated;
For greenhouse vegetables. If you take medicine in the morning, choose to ventilate the shed for a period of time; if you take the medicine in the afternoon, choose to fight the medicine half an hour or an hour before the wind.
3) Determine according to the characteristics of pests and diseases
Such as the prevention and control of whitefly (flying away when touched), in the morning when the dew is not dry, fight drugs; control the flower scorpion horse, fight drugs in the morning when the flowers bloom; control leaf scorpion horses, fight drugs in the evening or evening.
Such as prevention and treatment of diseases, after the rain before the rain, before the watering, before the cloudy days, at the beginning of the disease, etc. (because many diseases mainly rely on running water, wind and rain to spread, at this time do not fight drugs, sick and crying is too late).
3. Select the right pesticide
If it is to prevent disease, first of all, it is necessary to prescribe the right medicine, know that the rickets should be used with peony, do not use drugs, recognize the difference between fungal disease drugs and bacterial diseases; secondly, rotate the drugs, do not blindly use the same agent.
If it is pest control, it is necessary to prescribe the insects, killing adults, killing eggs, killing larvae or nymphs, thereby reducing the source of insects; secondly, rotating the medicine, do not blindly use the same agent to prevent the increase of pest resistance and reduce the efficacy. .
4, the dilution of pesticides should be appropriate
The medication is diluted according to the instructions, and the severity of the occurrence of the pests may be slightly increased, but it is not recommended to double the use.
If you feel that the drug is not effective, you can rotate the pesticide of another mechanism on the one hand, and optimize your own drug-making technology on the other hand.
5, mixed pesticides should be reasonable
In the early stage of the disease, a protective fungicide + a systemic therapeutic fungicide;
In the case of insecticides, there are insecticides that have an ovicidal effect and an insecticidal action.
Note: The same ingredient should avoid mixing, and the copper preparation should avoid mixing with alkaline pesticides to prevent phytotoxicity.
When fighting drugs
6, master the fight drugs
For pests and diseases that are harmful to a certain part of the plant, focus on this part (such as leaf back, fruit, flower, stem base, etc.) when fighting drugs;
7, grasp the distance and speed of fight drugs
For example, the spray head of the knapsack electric sprayer should be kept at about 30-50 cm with the target; the motorized sprayer should be kept at about 1 m.
When people are going to fight drugs, it is easy to connect the tablets. If you go faster, some parts will not be able to get the medicine, so you must grasp the speed of walking and find a routine that suits you.
8, adjust the size of the drug drop
According to the performance of the sprayer and its nozzle, the appropriate droplet size is adjusted.
For the control of diseases and small insects such as aphids and whitefly in greenhouse vegetables, smoke machines can be selected;
For the prevention and control of pests and diseases in open field vegetables, it is necessary to choose a sprayer that sprays larger droplets.
After fight
9. Pay close attention to the development of pests and diseases
After a day or two of spraying, it is necessary to inspect the extent of pest control in the field in time to determine whether it is necessary to take another medicine or what medicine.
More pesticide encyclopedia , please pay attention to China Pesticide Network
(Source: Good Agricultural Resources Network)
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