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Many farmers have been consulting about the use of rapeseed field herbicides such as acesulfame-methyl and quizalofop-p. These are considered to be among the better options available for weed control in rapeseed fields. However, it's important to understand that each herbicide has its own specific application conditions and target weeds. Choosing the right one based on the situation can significantly improve effectiveness and safety.
According to **The China Pesticide Network**, it’s essential for farmers to pay attention to the correct usage methods of these two herbicides. Here is a detailed overview:
**Quizalofop-p-ethyl (Quinagrafing)** is a foliar-applied post-emergence herbicide used primarily for controlling annual grass weeds in winter rapeseed fields. It is effective against weeds like barnyard grass, goosegrass, crabgrass, foxtail, wild oats, and others. It is safe for winter rape and does not harm the crop when applied correctly.
Recommended dosage: For winter rapeseed fields with annual grass weeds, the recommended rate is 46.2–59.4 g/ha, applied through stem and leaf spraying.
**Benzoylurea herbicides**, such as **aminoxyfen (5% wettable powder)**, are systemic and selective sulfonylurea herbicides. They are absorbed through the stems, leaves, and roots of weeds and transported within the plant, causing growth inhibition and chlorosis. This herbicide is effective against annual broadleaf weeds like mother chrysanthemum, wild sesame, spring sorghum, wild mustard, leeks, and others.
Dosage recommendation: Apply 30–40 g/mu (approximately 2–2.7 kg/ha) by stem and leaf spraying. Keep in mind that 1 hectare equals 15 mu.
Important notes:
1. Apply the herbicide 7–10 days after transplanting winter rapeseed, either before or early after weed emergence.
2. Brassica napus (oilseed rape) is more tolerant to this product, while mustard-type rapeseed is more sensitive. The 1–2 leaf stage is a high-risk period for phytotoxicity, while the 4–5 leaf stage is safer.
3. The herbicide is highly sensitive to rice and is not safe for rice or corn fields. However, it is relatively safer for cotton, peanuts, and soybeans planted later.
4. Ensure the soil pH is below 7 and maintain a 180-day interval between pesticide applications to reduce risks for subsequent rice planting.
By understanding these details, farmers can make informed decisions and apply herbicides more effectively and safely. Always follow the manufacturer's instructions and local agricultural guidelines for optimal results.
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