Carrot Disease Fungicides Post-Harvest

Ontario Carrot Growers Receive Emergency Use Registration for White Mold

J. Chaput, OMAFRA, Minor Use Coordinator, Guelph

The Pest Management Regulatory Agency (PMRA) recently granted the approval of an emergency use registration for SCHOLAR 230SC (fludioxonil) for control of white mold (Sclerotinia) on stored carrots in Ontario. Scholar 230SC 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 white mold of stored carrots. There have been no new products registered in Canada for white mold management on stored carrots in many years and the risk of serious losses is high.

The emergency use registration of Scholar 230SC 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 230SC.

Scholar 230SC Fungicide can be used for control of white mold on stored carrots in  Ontario until December 31st, 2012 only. Scholar 230SC can be applied once as a post-harvest dip or drench immediately before storage. Mix 496 mL of product in 378 L water. This amount can treat up to 90,000 kg of carrots.


Follow all other precautions and directions for use on the Scholar 230SC Fungicide label carefully.
Scholar 230SC Fungicide should be used in an IPM program and in rotation with other management strategies to adequately manage resistance.

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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