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Will the use of low rates of paraquat increase the risk of paraquat or glyphosate resistance?

April 26, 2017glyphosate increase low paraquat rates resistance risk

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Will the use of low rates of paraquat increase the risk of paraquat or glyphosate resistance?

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Yes. Herbicides should only be used at rates that consistently give high levels of weed control. On average, using lower rates increases the chance of weeds surviving the paraquat application. The likely result is higher weed numbers a factor that can increase the risk of paraquat or glyphosate resistance. Also studies have indicated that paraquat resistance can develop more quickly if lower rates (less than 1L/ha of paraquat) are routinely used on outcrossing weed species like annual ryegrass. This is caused by the pattern of inheritance of paraquat resistance in annual ryegrass. Therefore, the recommended product label rate for the purpose should always be used.