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Chris writes

How often is rotating fungicides with different modes of action in different class/groups recommended?

For instance, if I have applied Heritage G twice this season at the recommended rate of 2lbs/1000 sq ft, should I switch to a fungicide in a different group if I need to apply fungicide again this season. Or can I apply Heritage G again?

Answer:

Typically rotating fungicides after 2-3 applications is recommended to prevent resistance. The days between applications and number of sequential treatments recommended is based off the product label of each fungicide. Please view our article A Beginner's Guide to Fungicides. for more information. 

Answer last updated on: 08/03/2021

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Headway G Fungicide Granules

Headway G Fungicide Granules

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