From labels and weed guides
Best herbicides for annual smartweed in sorghum-sudangrass
For annual smartweed in sorghum-sudangrass, the weed guides list 1 active-ingredient group rated good or excellent, after checking that the products are labeled for sorghum-sudangrass.
Annual Smartweed control in sorghum-sudangrass
Every listed product is labeled for sorghum-sudangrass. Ratings are shown when each weed guide that rates this weed stays at good or excellent for the active-ingredient group. If a guide gives a range, the weaker end of the range has to be good or excellent.
Based on 1 weed guide, 1 active-ingredient group is rated good or excellent for annual smartweed in sorghum-sudangrass.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| AAtrex 4L EPA 100-497; same active ingredients on 25 other branded products | atrazine | 5 | ND Weed Guide 2026: E (PDF) |
Rating legend: E=excellent, G=good, F=fair, P=poor, N=no control. A range such as G-E means the guide gives a range; 'a' after a rating (e.g., Ga) means the guide assumes its recommended additive.
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Sources
Data from current labels and weed guides. Last source update: 2026-07-14.