Resistant Foxtail Note

We have received a report about a new location of a potentially ALS-inhibitor resistant giant foxtail. This is in addition to other confirmed reports of ALS resistant giant and green foxtail in Wisconsin that we announced last year. I wanted to mention this for two reasons. First, this ALS resistance was selected with about 6 years of continuous ALS herbicide use (if resistance is confirmed). This should serve as a warning for those using the same herbicide program year after year, especially ALS herbicides. Second, if you encounter poor control, consider resistance as a possible cause. The biggest clue in this regard is if only one weed species has escaped control. This means that the herbicide was applied correctly since the other weeds were controlled. Unfortunately, herbicide resistance will continue to occur. I just hope that we can delay the rate that it develops.

June 2001


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