Pesticides occupy an important proportion in agricultural production and play an irreplaceable role in agricultural plant protection . However, many farmers often think that as long as they can eliminate pests and diseases by fighting drugs, they can guarantee a bumper harvest, but it is not so simple. Pesticides are not omnipotent, and they cannot solve all plant protection problems. Moreover, the use of pesticides must be scientific and standardized, otherwise there will be no effect or even a risk of phytotoxicity. Today, Xiao Bian will take a few misunderstandings of the medications he encountered and discuss with the farmers to see how many thunders you stepped on!
First, medication in advance
The "prevention-based" plant protection policy can be said to have been deeply human, and everyone is familiar with it. However, there are still quite a lot of misunderstandings and misinterpretations of this policy. It has been suggested that all the plants should be given medicine in the spring, and it is expected that this will prevent plants from causing pests and diseases. Is this really useful?
Because the disease has a certain incubation period, when the plant shows obvious symptoms, it indicates that the bacteria have invaded the plant for some time. Sometimes it is very effective to take medication in advance (just in time for the incubation period). Therefore, we advocate early prevention for diseases, but please grasp the time! You must master the occurrence period and regularity of various diseases, and spray prevention before the disease occurs, but you can get twice the result with half the effort. If the time to fight drugs is too early, it still has no effect.
For insect pests, we do not recommend taking drugs in advance! Because most of the insecticides currently used on the market are contact or stomach poisons, only insects that come into contact with or swallow the drugs will play a role in killing insects. It is a waste of cost when you use it without insects. Therefore, we advocate early drug use occurs in insects, because this time the pest resistance is not high, not much feeding, insecticide insecticidal action can give full play to the extent of victimization plants will not be greatly affected.
Second, can not prescribe the right medicine
This is a common problem in production. Many farmers lack the necessary knowledge of plant protection, and cannot diagnose correctly after the onset of symptoms, but use drugs blindly, thus delaying the timing of prevention. In view of the complexity of crop diseases, it is difficult to accurately determine the disease; and there are few professional plant protection personnel, so try to choose a broad-spectrum sterilization product or combination.
Third, the pursuit of quick-impact
Many farmers always like to choose quick-acting when choosing pesticides , because the quick-acting pesticides show their effects soon after they are used. Although some bio-pesticides work well, they are effective in the later stages because they are slow to be realized, and are not recognized by farmers.
If quick-acting is used when using insecticides, it is hoped that the pests will be killed immediately after spraying. However, some bio-pesticide insecticides are not easy to show effects because they only kill eggs or inhibit insect molting or slow effect, but are ignored by farmers. The most serious consequence of the quick-acting effect of farmers' friends is that the use of highly toxic, highly toxic and high-residue pesticides in some places still exists, and the pesticide residues in the products produced exceed the standard.
Fourth, do not read the instructions to dispose of drugs
It is often the case that in order to rush to cure plant diseases and insect pests or to be afraid of drugs, it is easy to increase the concentration of the drug during dispensing, so that plants are not only easy to produce drug resistance, but also highly susceptible to phytotoxicity. . Conversely, the random reduction of the dose also does not achieve the control effect.
Therefore, we can strictly follow the concentration ratio on the drug label when using the drug.
5. Increase the concentration or dosage of the drug at will.
Pesticide configuration is not proportional, no special measuring tools, only bottle caps and other non-standard utensils; no quantitative concept, generally exceed the specified concentration, not only cause waste, but also prone to phytotoxicity, but also accelerate the resistance of pests and diseases .
Some farmers' friends even have misunderstandings themselves. They believe that the higher the concentration of pesticides, the higher the control effect on pests and diseases. However, in the use of pesticides, sufficient water consumption is very important, because the eggs and bacteria are concentrated in the back of the leaves and in the soil adjacent to the roots. The amount of water used in the application is small, it is difficult to spray the whole plant, and the residual in the dead corner Eggs and residual bacteria can easily erupt again. Increasing the concentration can also strengthen the pathogens and pest resistance. If the concentration exceeds the safe concentration, phytotoxicity may occur.
Six, the treatment is not difficult enough
Some pests and diseases can be removed from the disease, and once effective. Others need to be completely cured after several consecutive days of medication. For example, red spiders and aphids in insects often overlap in generations, that is, eggs, nymphs, and adults coexist, and most of the agents have no effect on eggs. Therefore, it is necessary to continuously apply the pesticide 2 times to 3 during the continuous incubation process of the pests and the effective period of the drug. Times. The prevention and treatment of diseases generally requires three consecutive sprayings from 3 days to 5 days.
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