Pre-emergence Residual Herbicides are the Foundation of Soybean Weed Control

Amit Jhala – Extension Weed Management Specialist, University of Nebraska-Lincoln

Post-emergence herbicide options for weed control in soybean are limited, particularly where glyphosate-resistant weeds are a problem. Six weed species in Nebraska have now been confirmed resistant to glyphosate and their populations are widespread. Summer annual weed species such as common waterhemp, Palmer amaranth, velvetleaf, and foxtail emerge at the same time as soybean and can be particularly troublesome in some parts of Nebraska. In addition, many populations of these weed species in Nebraska are glyphosate-resistant. Weed management programs using other herbicides in addition to glyphosate are needed to manage these populations.

Why early-season weed control in soybean is important

  • Pre-emergence, residual herbicides
    • mitigate yield loss due to weed competition,
    • provide a longer time for soybean to establish, and
    • reduce the selection pressure for herbicide resistance to post-emergence herbicides because fewer weeds will be exposed to post-emergence herbicides.

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