Why is it easy to produce phytotoxicity during the rainy season?

The rainy season is a strong period of weed growth, and it is also the season with the most herbicides. So why is the rainy season susceptible to phytotoxicity?
The main causes of phytotoxicity:
The problem of phytotoxicity caused by herbicide drift caused by non-target crops and sprayed herbicide sprayers is commonplace. 24-D butyl ester is the most used herbicide in wheat field. Because of its strong volatility, serious drifting and high residue, it is easy to drift and harm neighboring cotton, beans and vegetables during the process of weed control. Sensitive crops such as fruit trees. If the sprayer sprayed with the herbicide is not thoroughly cleaned, and other pesticides are added to control the above-mentioned crop pests and diseases, herbicide phytotoxicity may also occur.
Some herbicides do not exhibit phytotoxicity on seasonal crops, and residual pesticides often endanger crops. For example, the use of simazine to control weeds in corn fields is good. If the cultivar is planted with rape, the seed germination and emergence will be slow, and the apical bud sheath will become brown or rot, which will have a great impact on the yield. For example, when wheat is sprayed with wheat straw, it does not cause phytotoxicity, while when planting summer peanuts, the young roots will be hypertrophied and rotted, and the seedlings will be yellow and gradually die, resulting in severe yield reduction.
Improper use of the agent causes damage to the target crop. In particular, phytotoxicity caused by the use of the variety is not correct, the dosage is increased arbitrarily, and the application of the drug during the sensitive period of the crop occurs. Excessive application of herbicides in rice will result in loose plant type, tilting of tillers, brown spots on leaves, formation of onion tube leaves, and dwarfing of plants, resulting in severe yield reduction. After the wheat enters the jointing stage, it is very sensitive to the herbicide. If the herbicide or the ethyl 4-chloro chloride is used, it is easy to cause the wheat ear deformity.

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