Pacific Northwest 1998 An Online Guide to Plant Disease Control

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Peppermint (Mentha spp.) -- Stolon Decay and Canker
 
Cause: Several fungi that live in soil. Stolon decay is associated with Fusarium solani. Stem and stolon canker are caused by Rhizoctonia solani.
Symptoms: Roots, runners, and rhizomes have brown or black progressively rotting areas. Stands may be greatly reduced, frequently in spots.
Cultural control:

  1. Plow in fall.
  2. In low areas where water collects for extended periods, early spring plowing ensures a good stand of new shoots will become established before parent runners or rhizomes completely rot.
Chemical control: For control of Rhizoctonia, Quadris Flowable at 6.2 to 15.4 fl oz/A at 10- to 14-day intervals. Do not make more than three applications/A/year. Do not exceed 1.44 qt/A/season. For resistance management, do not apply more than twice consecutively before rotating to a labeled nonstrobilurin. May be applied up to 7 days before harvest on mint for oil; may be applied the day of harvest on fresh mint. 4-hr reentry.
Content edited by: Cynthia M. Ocamb on January 1, 2009
 
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