Can I use higher herbicide rates to control a resistant weed?
No, the resistant biotypes are often many times more resistant to the herbicide than normal, susceptible biotypes. In greenhouse tests, the Accent rate had to be about 20 times higher to control ALS-resistant giant foxtail at the same level as susceptible giant foxtail. With ALS-resistant eastern black nightshade, the Raptor rate had to be increased 133 times higher to get the same level of control as with susceptible nightshade. Wisconsins atrazine-resistant velvetleaf is also about 100 times more resistant than susceptible velvetleaf. We could not afford to spray these herbicides at rates high enough to kill these resistant biotypes, even if it was legal.
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- How may IMPACT herbicide fit into my corn weed control program?
- Can I use higher herbicide rates to control a resistant weed?
