The same crop, the adjacent plot, someone who spent twice the money of others can not prevent the disease, why? Clean the sprayer and the pipeline before the fight, do not miss the spray, re-spray, etc. clear. Is there a "doorway" that needs attention when you fight drugs, after you fight drugs, and when you fight drugs?
First, 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.
In high temperature weather, it should be taken before 10:00 am and after 4 pm;
In cold weather, you should fight after 10:00 am and before 2 pm;
In the greenhouse in winter and spring, it is best to fight in the morning in sunny 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.
When the humidity of the air is too high, the deposited liquid will become a larger droplet, and after being affected by gravity twice, it will deposit on the lower part of the plant, thereby causing phytotoxicity;
When the humidity of the air is too small, the liquid easily evaporates, resulting in less exposure to the target, thereby reducing the efficacy, and severe burning lesions. Therefore, the fight drug environment should be kept ventilated.
Open field vegetables, you can properly trim some leaves and branches of the plant to keep the field ventilated and breathable.
Greenhouse vegetables, if you take medicine in the morning, choose to ventilate in the shed for a period of time, if you take 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 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 therapeutic fungicide is absorbed by a protective fungicide.
In the case of insecticide, it is optional to use an insecticide which has an ovicidal action and an insecticidal action.
Note: The same ingredient should avoid mixing, and the copper preparation should avoid mixing with alkaline pesticides to prevent phytotoxicity!
Second, 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.).
7, grasp the distance and speed of fight drugs
For example, the nozzle of the knapsack electric sprayer should be kept at about 30-50 cm from the target;
The motorized sprayer is kept at around 1 meter.
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.
When using greenhouse vegetables to control diseases and small insects such as aphids and whitefly, you can choose a fog machine;
When the open field vegetables are used to control pests and diseases, it is necessary to choose a sprayer that sprays larger droplets.
Third, after the 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.
Special attention: After the rain, it is necessary to do a good job of vegetable protection measures, and timely drainage, pay attention to fight drugs (protection treatment), promptly clean up the diseased plant debris, reduce the source of infection!
More pesticide knowledge , please pay attention to China Pesticide Network
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