What are the precautions for using pesticides on grapes? Understand the latest key points in one article

Summer high temperatures are precisely the season when pests and diseases run rampant. Grapes are nearing harvest at this time, and if pest and disease control work is not done well, it can easily lead to reduced yields and seriously affect profits. However, when carrying out chemical control, pesticides must be used scientifically and reasonably to avoid counterproductive effects. So what should be noted when using pesticides on grapes? Let us learn about it together.

1. Use pesticides according to the symptoms

For diseases at different stages of the entire grape growth period, the corresponding control pesticides should be used accurately. For example, for the prevention of black pox, Bordeaux mixture, chlorothalonil, etc. can be used, and after the disease occurs, pesticides such as Fuxing and Xiansheng can be used for treatment. For downy mildew, Mengshasheng, phosethyl-Al, etc. can be used for prevention, and after the disease occurs, metalaxyl + mancozeb can be sprayed for treatment; for anthracnose, thiophanate-methyl and carbendazim can be used for prevention, and after the disease occurs, thiram, Tuzet, etc. can be used for treatment; for gray mold, iprodione and procymidone can be used for prevention, and after the disease occurs, pesticides such as Shijiale and Lüheng No. 5 can be used for treatment.

2. Use pesticides at the right time

For the prevention and control of pesticide damage in grapes, pesticides should be applied in a timely manner before and after rainfall according to the rainy characteristics of the growth period, which can achieve twice the result with half the effort. Before rain, sprays should preferably use systemic protective pesticides that are also resistant to rain washing, such as Shibaoling, thiophanate-methyl, carbendazim, etc. After rain, therapeutic pesticides should preferably be used, such as Tuzet, thiram, etc. The more promptly pesticides are sprayed after heavy rain, the better the control effect.

3. Mix pesticides scientifically

There are many types of grape pests and diseases, and the corresponding pesticide types and number of applications are relatively many. To save time and effort, growers often mix pesticides together in a concentrated way. This not only saves time but can also effectively improve pesticide efficacy. However, if the scientific principles of mixing are not mastered, it may not only reduce pesticide efficacy, but may even cause pesticide damage, leading to leaf curling and spots, reducing photosynthesis, resulting in insufficient nutrient synthesis, which is detrimental to yield.

4. Rotate pesticides

Pesticides that easily produce resistance should not be used continuously. Most fungicides used to control grape diseases will produce resistance, especially in the rainy conditions of the south, where the pesticides used for disease control and the number of sprays are more than double those in the north. Repeated use of pesticides will reduce their effectiveness, so in order to reduce resistance and enhance control effects, each pesticide should be used alternately with other pesticides, and it is recommended that the number of uses throughout the entire growth period not exceed 3 times.

The above is an introduction to the precautions for using pesticides on grapes. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.