Comparative analysis of the use of two herbicides in rapeseed field

Many farmers are seeking advice on the use of rapeseed field herbicides such as acesulfame-methyl and quizalofop-pure, which are considered to be more effective options. In fact, these two herbicides represent some of the best choices available for controlling weeds in rapeseed fields. However, it's important to choose the right one based on specific conditions and weed types. The China Pesticide Network has prepared a detailed guide to help farmers understand the proper usage and precautions associated with both herbicides, enabling them to make informed decisions.

Quizalofop-pure is a foliar-applied post-emergence herbicide designed to control annual grass weeds in winter rapeseed fields, as well as in alfalfa, goosegrass, crabgrass, foxtail, wild oats, and other similar weeds. It is safe for winter rapeseed and can effectively manage species like maidenhair, valerian, and bismuth. The recommended dosage for winter rapeseed fields targeting annual grass weeds is 46.2–59.4 g/ha, applied through stem and leaf spraying.

On the other hand, benzosulfuron-methyl 5% (wettable powder) is a systemic and selective sulfonylurea herbicide that is absorbed through the stems, leaves, and roots of weeds. It moves within the plant and inhibits growth, causing chlorosis in the leaves. This herbicide is ideal for controlling annual broadleaf weeds such as mother chrysanthemum, wild sesame, spring sorghum, wild mustard, leeks, and many others. For winter rapeseed fields, the recommended application rate is 30–40 g/mu, also applied via stem and leaf spray. Note that 1 hectare equals 15 mu, and the active ingredient concentration can be calculated using the formula: (formulation content × 1,000,000) ÷ dilution factor.

When applying these herbicides, there are several key points to consider:

  1. Winter rapeseed should be treated 7–10 days after transplanting, 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, whereas the 4–5 leaf stage is considered safe.
  3. This herbicide is highly sensitive to rice, making it unsafe for rice paddies or corn fields. However, it is safer when used in cotton, peanut, and soybean fields during later growth stages.
  4. To ensure safety for subsequent rice planting, the interval between pesticide applications should be at least 180 days. Additionally, soil pH should be below 7 for optimal performance.

By following these guidelines, farmers can maximize the effectiveness of their herbicide use while minimizing risks to crops and the environment. Always refer to the manufacturer’s instructions and local agricultural recommendations for the best results.

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