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Wheat may be harmed by broad corn
In Xuzhou City, a local farmer reported that a 2.5-acre wheat field experienced widespread yellowing of seedlings and some plant deaths after applying Kosoma. According to the farmer, he applied 20 ml per mu of broad-spectrum corn herbicide around November 10th, when the wheat was in the 4-leaf stage and appeared healthy. The variety used was "F90," though its strength is not clearly known. He is now seeking advice on how to rescue the affected wheat and whether Shuofeng 481 could help.
First, let's analyze the potential phytotoxicity. Kosoma contains 3.6% water-dispersible granules, with 3% methylsulfuron-methyl and 0.6% methyl iodosulfuron-methyl. It is registered for use in wheat fields to control both grassy and broad-leaved weeds. However, improper application can lead to crop damage.
Methylsulfuron-methyl, one of the active ingredients, has been associated with phytotoxic effects in certain wheat varieties, especially hard or strong gluten types. For example, varieties like Yangmai 158, Yanzhan 4110, and Jimai 20 are particularly sensitive. In recent years, Bayer has phased out some formulations and improved safety by combining it with other products.
The "F90" variety mentioned may be a hard keratin type, such as Mexican F90, which has high wet gluten content and is often used for bread production. These types are more prone to injury from sulfonylurea herbicides like Kosoma.
Proper application is critical. Under normal conditions, following recommended dosages (0.54–0.9 g per kg of product) is safe. However, under stress conditions—such as frost, waterlogging, or salt damage—overuse or incorrect timing can cause serious harm. Farmers should avoid applying the herbicide if the wheat is already stressed or if temperatures drop below 3°C.
Timing and method are also important. Application should occur before winter, no later than March 1st. Mixing with a surfactant, using proper nozzle types, and ensuring even coverage are all essential steps. Avoiding over-application and ensuring no water accumulates in the field after spraying can further reduce risks.
Kosoma is not suitable for spring wheat or other crops like barley, corn, or sorghum. It should not be mixed with 2,4-D or long-lasting herbicides.
For post-application care, if the wheat shows mild yellowing, it may recover naturally. But if the damage is severe, rescue measures are needed. Shuofeng 481, containing alizarin lactone, has shown some effectiveness in mitigating sulfonylurea herbicide damage. However, its efficacy depends on the severity of the injury.
To support recovery, farmers can apply urea, humic acid-based fertilizers, or organic materials to protect the seedlings and improve growth conditions. Strengthening field management and providing adequate nutrients can help restore the wheat’s health.