Carrot Pest Management

Carrot Growers Receive Emergency Use Registration for White Mold

J. Chaput, OMAFRA, Minor Use Coordinator, Guelph

The Pest Management Regulatory Agency (PMRA) recently announced the approval of an emergency use registration for SCHOLAR 50WP (fludioxonil) for control of white mold (Sclerotinia) on stored carrots in the provinces of Quebec, Nova Scotia, Prince Edward Island, Manitoba, Saskatchewan, Alberta, British Columbia and Ontario.  Scholar WP was already labeled in Canada for control of post-harvest diseases on pome fruit and stone fruit.  Furthermore a complete minor use submission is underway with the Agriculture & Agri-Food Canada, Pest Management Centre (AAFC–PMC) minor use program to seek eventual, full registration of SCHOLAR for white mold control on stored carrots in Canada.

White mold (Sclerotinia sclerotiorum) is a serious disease of carrots and many other crops around the world.  In Canada, white mold is considered to be one of the major limiting factors to the successful long-term storage of carrots.  Losses of 50-100% have been reported by growers in Canada in recent years.  Since the loss of the fungicide Benlate several years ago, carrot growers have had no post-harvest fungicide treatments to reduce losses to this disease.

Scholar fungicide was identified as a viable solution to help manage while mold of stored carrots.  There have been no new products registered in Canada for white mold management on stored carrots in many years and control failures continue to increase.

The emergency use registration of Scholar 50WP Fungicide will help in the interim to manage white mold on stored carrots, however management of white mold still requires a comprehensive IPM and resistance management program with access to all available tools and strategies.  The following is provided as general information only.  Users should consult the complete label before using Scholar 50WP.

Scholar 50WP Fungicide can be used for control of white mold on stored carrots in Quebec, Ontario, Nova Scotia, Manitoba, Saskatchewan, Alberta, British Columbia and Prince Edward Island until December 31st, 2010 only.  Scholar 50WP can be applied once as a post-harvest dip or drench immediately before storage.  Mix 227 g of product in 378 L water.  This amount can treat up to 90,000 kg of carrots.


Follow all other directions for use on the Scholar 50WP Fungicide label carefully.

Scholar 50WP Fungicide should be used in an IPM program and in rotation with other management strategies to adequately manage resistance.

We wish to thank Brian Beaton, Prince Edward Island Department of Agriculture for preparing the rationale documents on behalf of Ontario, Quebec, Nova Scotia, Manitoba, Saskatchewan, Alberta, British Columbia and PEI carrot growers as well as Dr. Rick Peters, AAFC, Charlottetown, Marion Paibomesai, OMAFRA, Mario LeBlanc, MAPAQ, the personnel of the ministries of agriculture of Manitoba, Saskatchewan, Alberta, British Columbia and Nova Scotia for their input, support and assistance.   We also wish to thank the personnel of the respective provincial ministries of Environment in Ontario, Manitoba, Quebec, Alberta, Saskatchewan, Nova Scotia, British Columbia and PEI and Syngenta Crop Protection Canada Inc. for their support of this registration and the personnel of the Pest Management Regulatory Agency for evaluating and approving this important pest management tool.  Special thanks are expressed to the PEI Dept. of Agriculture who generously covered the submission fee for this emergency use registration.

For copies of the emergency use label contact Marion Paibomesai, OMAFRA Vegetable Crops specialist at Guelph (519) 826-4963, Jim Chaput, OMAFRA, Guelph (519) 826-3539 or visit Syngenta Crop Protection Canada at

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