Fall can be an excellent time to control many winter annuals like
Problems with spring applications
Spring weather is often not favorable for herbicides applications. Cool, wet conditions can make timely herbicide applications a challenge, especially when targeting winter annuals that already have a jump on the season. Herbicide applications need to be made early to provide effective control on winter annuals.
Benefits of fall applications
Another benefit to fall herbicide applications is that most herbicides used to control downy brome in winter wheat have some fairly long crop rotation restrictions. When applied in the fall, the rotation restriction is much less of a concern for the crop after the winter wheat.
Fall herbicide applications also work better on
Considerations before applying
Producers should be sure to carefully scout fields prior to any herbicide applications. When considering fall herbicide applications weeds should be healthy. Most herbicides work best when temperatures are in the upper 50’s and 60’s. A hard frost will limit the effectiveness of the herbicide on many weeds.
Source: South Dakota State University
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