Chateau herbicide now registered on sweet potatoes

From Jim Chaput, Minor Use Coordinator, and Melanie Filotas, Specialty Crops IPM Specialist, OMAFRA

The Pest Management Regulatory Agency recently announced the approval of Chateau Herbicide for control of weeds on sweet potatoes in Canada. Chateau® Herbicide was already labeled for management of weeds on several fruit and vegetable crops and non-crop areas in Canada.  The active ingredient in Chateau, flumioxazin, has been used for several years in sweet potato production regions in the United States.  

This minor use project was originally submitted by Ontario in 2011 as a result of minor use priorities established by growers and extension personnel in Canada. Management of weeds on sweet potatoes has been a priority of producers.

The following is provided as an abbreviated, general outline only. Users should consult the complete label before using Chateau.  Chateau is registered for suppression of pigweed (redroot and green), common ragweed, lamb’s-quarters, hairy nightshade and eastern black nightshade in sweet potatoes.  Apply 105 g/hectare as a single application prior to transplanting sweet potatoes and prior to weed emergence.

Do not use on any sweet potato variety other than Beauregard unless user has tested Chateau® Herbicide on other varieties and has found acceptable crop tolerance. Do not plant greenhouse-grown sweet potato slips into fields treated with Chateau.  Moisture is necessary to activate Chateau for residual weed control and dry weather following applications may reduce effectiveness.  However, crop injury may occur with application of Chateau to poorly drained soils or under cool/wet conditions, or if there is soil flooding after application.  See product label for details.

Carefully follow all label recommendations for resistance management, environmental hazards and other precautions.  This product is toxic to aquatic organisms, small wild animals, beneficial insects and non-target terrestrial plants. Do not contaminate aquatic habitats when spraying or when cleaning and rinsing spray equipment or containers.

We wish to acknowledge the personnel of the Pest Management Regulatory Agency for evaluating and approving this weed management tool and Valent Canada Inc. for supporting the label expansion in Canada.

For a copy of the new minor use label contact Melanie Filotas, OMAFRA, Simcoe (519) 426-4434 or visit the PMRA label site

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