7/25/2012 4:07 PM
Jerrett,
We start applying a rotation of strobilurin fungicides, like Heritage, Insignia or Compass, along with Cleary's 3336 about 30 days apart at full label rate starting in June. We always water these products into the upper thatch layer near the crown of the plant. It's also advisable to apply a few applications of Ammonium Sulfate, as the pathogen dislikes the lower pH. Avoid liming or anything that increases pH. I'd also avoid any stresses, like verticutting and topdressing during periods of high stress, especially during times of cloudy and wet weather patterns. Just leave them be.
It's also been advised to do two applications of the same product back to back, 14-21 days apart. Kind of like a kicker for the first app.
This pathogen is also typically associated with Pythium. We like to apply an app of Banol somewhere in there as well for this.
Long term, of course the usual - improve drainage and reduce thatch. Also consider spraying a DMI in early spring before the weather heats up. They kind of act like a soil "sterilant" and gets you off to a fresh start.
Hope this helps and provided something you may not have thought of.