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Here’s advice for how to be proactive in controlling giant ragweed.

Tom J. Bechman HEAR THEM GROWL! If giant ragweed are large when you spray them postemergence, you may make them mad, but you likely won’t kill them, says weed control specialist Bill Johnson. Catch them while they’re small for better control. This is one weed for which there are better postemergence options for control than residuals. The grower who drove his sprayer over the hill and found patches of giant ragweed in the no-till soybean field pictured here was d...