When applying **fungicides** to cotton seedlings, it's important to follow certain guidelines to maximize their effectiveness. First, understand the type of fungicide you're using. There are two main categories: **protective fungicides**, which are applied before disease occurs, and **curative fungicides**, which are used after symptoms appear. Protective options include products like Bordeaux mixture, mancozeb, and carbendazim, while curative ones such as anti-Qingning or Baozhida work best when applied early in the infection stage.
It’s best to spray fungicides either before 9 a.m. or after 4 p.m. Avoid applying them during the hottest part of the day, as high temperatures can cause the chemical to break down quickly, reducing its effectiveness. Also, make sure not to mix fungicides with **alkaline pesticides**, as this can lead to reduced performance or even damage to the plants.
Always dilute the fungicide properly before use. Most fungicides come in powder, emulsion, or suspension form, so it’s crucial to mix them with water correctly. Start by dissolving the product in a small amount of water, then add more water and stir thoroughly. If you’re mixing with other pesticides, always dilute the fungicide first before combining with other chemicals.
The recommended interval between applications is typically 7 to 10 days. However, if the pesticide has weak adhesion or poor systemic absorption, and rain occurs within three hours of spraying, reapplication may be necessary. Always check the label for specific instructions and ensure proper coverage to protect your cotton crop effectively.
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