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Questions When Managing Cercospora Leaf Spot of Sugarbeet (06/30/16)

As we get closer to the time when growers will start fungicide applications for control of Cercospora leaf spot, growers usually have some questions they will like answered to help in their farm decision making processes.

Questions When Managing Cercospora Leaf Spot of Sugarbeet

As we get closer to the time when growers will start fungicide applications for control of Cercospora leaf spot, growers usually have some questions they will like answered to help in their farm decision making processes.

Can glyphosate (with AMS) be added to fungicide when spraying for CLS to also provide weed control? Yes. Please note that the maximum amount of glyphosate that can be used in a single application from 8-leaf stage sugarbeet to canopy closure is 0.77 lb. acid equivalent.

Is glyphosate compatible with all fungicides or fungicide mixtures typically recommended for CLS control? No. It is not recommended to mix glyphosate with Minerva Duo since this results in some precipitation which may clog nozzles. Glyphosate can be mixed with (AgriTin + Topsin), Inspire, Proline, Priaxor and Gem fungicides without causing any phytotoxicity. Please note that we used water from Fargo in our trials. It is recommended to conduct a compatibility test of the products to be used with water from the source that will be used for the spraying operation since water quality may impact the miscibility of the products. If the herbicide + fungicide mixture is not compatible using a specific water source, the different groups of pesticides will have to be applied separately.

When mixing different products, follow the directions on the labels or the A.P.P.L.E.S. (2016 NDSU Weed Control Guide, Page 75) method. To a tank partially filled with water, Agitate and then add in the following order - Powders (dry), Powders (soluble), Liquid flowables and suspensions, Emulsifiable concentrates, and Solutions - making sure that each product is uniformly mixed before adding the next product.

Mohamed Khan

Extension Sugarbeet Specialist

NDSU & U of MN

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