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Keep size, species top of mind when scouting for weeds

By Kevin Johnson, crop protection research and development field scientist, Dow AgroSciences











In a post-glyphosate era where herbicide resistance is commonplace, growers need a clear strategy to  control weeds. Scouting fields for weeds in fall is vital to a successful year-round weed management program. Here’s why:

1. Size matters. One of the most important reasons to scout for weeds is to determine their size. A grower’s herbicide decision in fall and spring can depend on how large the weeds are. 

2. Identification is the key to control. Correct identification of weeds is imperative to select the right program to manage them effectively. The only way to identify weed species is to get into the field and scout for them.

3. Weeds can be managed early. Scout for perennial and winter annual weeds in the fall, especially after the first frost. This is an ideal time to control weeds because it is when they begin to draw resources below ground and into the root system.

4. Scouting creates field records. Fields often have unique areas with unique weed growth. Scout for weeds to keep a record of what and where species are growing throughout the field, especially in the weed hot spots. Knowing the weeds that grow each season can help determine the best control method next season.

For information on controlling weeds year-round with a residual herbicide, visit or contact your local ag retailer.

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