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Pre-Harvest Interval for Fungicides on Sugarbeet (08/06/15)

Timely applications of fungicides are very effective at controlling Cercospora leaf spot (CLS) on sugarbeet.

Pre-Harvest Interval for Fungicides on Sugarbeet

Timely applications of fungicides are very effective at controlling Cercospora leaf spot (CLS) on sugarbeet. Environmental conditions of temperature and free moisture in the form of rainfall or dew are favorable for infection and disease development.  As such, growers will need to apply fungicides for controlling Cercospora leaf spot.

Over 80% of the North Dakota and Minnesota sugarbeet crop is considered to be in good or excellent condition and sugar cooperatives have indicated they will start their pre-pile harvest in August (10-20). The roots harvested during pre-pile are taken directly to the factory for processing.

Since a small percent (10%) of the crop will be harvested during the pre-pile, growers need to plan and consider when and which fungicides are used on the portion of field to be harvested early.  The fungicides used for CLS control and their pre-harvest intervals are as follows: Quadris – 0 day; Headline – 7 days; Gem – 21 days; Priaxor – 7 days; Proline – 7 days; Eminent - 14 days; Inspire XT – 21 days; Topguard – 21 days; Topsin - 21 days; Mancozeb – 14 days; Super Tin and Agri Tin – 7 days.

Please feel free to call me for any clarifications.

Mohamed Khan

Extension Sugarbeet Specialist

NDSU & U of MN

701-231-8596

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