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Crop Stage For Clethodim (05/25/17)

Question: A question on the clethodim labels. The labels restrict application to “prior to bolting” for both canola and mustards. Is the clethodim actually causing some damage at this stage or does it have to do with the MSO oil? I get this question quite often, “Why can’t I spray clethodim after bolting. All it does is kill grass?”

Crop Stage For Clethodim

Question: A question on the clethodim labels. The labels restrict application to “prior to bolting” for both canola and mustards. Is the clethodim actually causing some damage at this stage or does it have to do with the MSO oil? I get this question quite often, “Why can’t I spray clethodim after bolting. All it does is kill grass?”

Answer: Clethodim is safe on vegetative tissue of canola and mustard crop plants. The tissue produced when plants begin the reproductive stage is less tolerant and injury can occur after bolting begins. A review of the weed guide shows the same application restriction applies to field pea and flax. MSO adjuvant significantly increases absorption of the active ingredient in both crop and weed plants. The aggressive MSO adjuvant can exacerbate the injury.

Rich Zollinger

Extension Weed Specialist

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