Weed Management Strategies for Double-Crop Soybeans

Summary:
With barley and wheat harvests progressing in Pennsylvania, the planting of double-crop soybeans is underway. Extension agronomist Dwight Lingenfelter emphasizes that weed control is essential for maximizing yield in these crops. Although double-crop soybeans generally face fewer weed problems due to their later planting date, weeds that do emerge can significantly affect yields, especially in dry conditions.
One major concern is managing glyphosate-resistant marestail, which becomes more challenging if cut off during small grain harvest. Various herbicides and strategies are recommended for effective weed control, including the use of glyphosate, 2,4-D LVE, Sharpen, Liberty, and others. Farmers are advised to be cautious of herbicide drift and to follow specific guidelines regarding application timing and tank-mixing.
Residual herbicides are also crucial for controlling problem weeds like Palmer amaranth and waterhemp. These herbicides need adequate rainfall to be effective, with different products performing better under varying moisture conditions. The article provides detailed herbicide options and recommendations tailored to the specific weed challenges and environmental conditions faced by Pennsylvania farmers.