Before or after the rain, which time is the best time to take medicine? Are you sure?

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Recently, there have been frequent rains, and many fruit farmers have doubts about whether it is better to apply pesticides before rain or after rain when controlling pests and diseases. Many people may think that it is better to take medicine before it rains than after it rains. If the pesticide is applied before it rains, it will affect the spraying effect of the drug and cause waste. Actually, it's not. If the drug is used before it rains, the efficacy will not be greatly reduced, and the absorption, utilization and effect of the drug will be higher than that after it rains.

0 1? The benefits of taking medicine before it rains

Many people always think it is a waste to take medicine before it rains. In fact, spraying drugs before it rains can kill germs lurking in leaves and peels in advance. Reduce the number of pathogenic bacteria, so that bacteria will not multiply after rainfall.

Taking medicine before it rains can also repair the wound in advance, prevent the infection of germs and reduce the occurrence of diseases. Pesticide application before rain can also restore the growth potential of plants. Spraying targeted chemicals can directly supplement nutrients, reverse plant growth potential and improve disease resistance and stress resistance.

02? Disadvantages of applying pesticides after rain

The efficacy of drugs used after rain is far less than that before rain, because the absorption and utilization rate of drugs by plants after rain is relatively low, and the leaves and roots of crops have reached saturation at this time. At this time, the crops can't absorb much liquid medicine, so the effect of medication will be greatly reduced. In addition, after the rain, the air humidity is relatively high, and pathogenic bacteria will multiply in large numbers when they meet suitable conditions. If we miss the best time to take medicine, the difficulty of prevention and treatment of the disease will be greatly increased. Therefore, the timing of prevention and control must be on the premise of rain, so as not to miss the best opportunity and cause great losses.

Analysis of different crops

Fruit tree spray

It is best to spray pesticides on the fruit trees before it rains, because there are fewer germs on the fruit trees and fewer germs in the fields before it rains. On the other hand, spraying pesticides before rain will better protect crops from diseases, thus improving the quality and yield of fruit trees.

The varieties of chemicals sprayed before rain are generally mainly protective fungicides, and protective fungicides and therapeutic fungicides can also be used alternately or mixed.

If for other reasons, you can't spray the medicine in time before it rains, then spray the therapeutic bactericide in time after the rain to minimize the harm of germs. After the rain, the concentration of sprayed drugs should also be appropriately increased. If the pathogen base is large, it is difficult to achieve the expected control effect.

Field spraying

Field crops such as fruit trees need to be sprayed before it rains. For example, in the growing season of wheat, if it encounters late spring cold, extreme weather or rainy weather, diseases such as wheat rust, sheath blight and scab will spread very fast, and in severe cases, it will lead to wheat yield reduction or even no harvest. At this time, even if spray control is carried out, the control effect will not be very good and the control cost will increase. Therefore, it is best to spray the field crops before it rains, which is not only effective, but also saves money.

vegetable crop

Diseases and pests of vegetable crops occur frequently throughout the growing season. Spraying pesticides on vegetables before it rains can play a good role in preventing diseases and insects, and at the same time improve the quality of vegetables.

Before the rain, the pathogen base of vegetables was relatively small and there were many pests. If pesticides are not sprayed in advance, there will be more insect holes in the leaves and fruits of vegetables than usual, which will seriously affect the sales and yield of vegetables. Continuous rainfall will cause vegetable root rot, angular leaf spot, downy mildew, powdery mildew and other diseases to spread rapidly, which can reach more than 60% overnight, increasing the difficulty of prevention and control, so it is best to spray drugs to prevent and control vegetable diseases and insect pests before it rains.

Analysis of Different Pesticides

fungicide

Spraying fungicides with strong internal absorption before rain can be absorbed by crops, and can also kill pathogenic bacteria hidden in bark, leaf back and fruit shell in advance, thus reducing the number of pathogenic bacteria. After rain or continuous rain, a large number of germs will breed, especially apple rot, powdery mildew, root rot, anthracnose, downy mildew and other germs will spread faster after rain. If the rain lasts for a long time and the germs multiply and spread quickly, it is difficult to achieve the expected disease prevention effect by spraying fungicides after the rain. At the same time, the leaves are delicate after rain, and spraying pesticides in high temperature weather will also cause certain damage to the leaves. Moreover, after the rain, the air humidity in the field is relatively high, and the ventilation and light transmission in the field are not very good, and the utilization rate of pesticides will be greatly reduced.

Insecticide

The occurrence of insects is influenced by many factors, and has a great relationship with temperature and humidity. If the insect population caused by insects is not treated in time before it rains, fruit rot and leaf rot will occur. Such as wheat aphid, peach aphid, apple yellow aphid, thrips and other sucking insect pests. If it is not prevented before the rain, the crop yield will be greatly reduced. High temperature and dry weather before rain will also lead to mites rampant and multiply rapidly. Some fruit tree leaves are seriously damaged by mites, which will cause a lot of deciduous leaves. So it is suggested that it is best to spray pesticides before it rains.

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