Stem and leaf treatment involves applying herbicide solutions evenly to the stems and leaves of emerged weeds. According to the China Pesticide Network, the selectivity of these herbicides is mainly achieved through differences in the morphological structure and physiological or biochemical characteristics of plants. Some post-emergence herbicides, such as aryloxyphenoxypropionic acid herbicides, are highly sensitive to soil moisture levels. During dry conditions, their effectiveness can significantly decrease. To maximize the herbicidal effect, it's crucial to apply them at the right time.
Post-emergence stem and leaf treatments are commonly used in rice fields with selective herbicides like bensulfuron-methyl, which help control weeds growing around and between rice seedlings. These methods are effective in reducing competition for nutrients and water, ultimately improving crop yield.
The China Pesticide Network reminds users that when choosing herbicides for stem and leaf treatment, there are three key factors to consider. First, timing is critical—such as applying herbicides after rice transplanting, during the 2-3 leaf stage for soybeans, or the 3-4 leaf stage for corn. Second, selecting the right herbicide based on the type of weed present is essential for optimal results. Third, it’s important to be aware of the residual effects of herbicides. For example, some broadleaf herbicides used in rapeseed fields, like sulfosulfuron, can remain active in the soil for several months or even years. This long-lasting effect can cause damage to subsequent crops if not managed carefully.
By following these guidelines, farmers can ensure effective weed control while minimizing risks to crop health and the environment. Always read the label and follow local regulations when using herbicides.
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