Home > Weekly Update > Gray Leaf Spot is still going strong.

Gray Leaf Spot is still going strong.

In the past two weeks, just about all I have looked at is Gray Leaf Spot. It is everywhere and at a level I have never seen before in the Northeast. It is probable that much of what we are seeing is because of the very mild winter- much like the mid-Atlantic where this disease is a perennial problem. Gray leaf spot is not very winter hardy and without any winter last year and Hurricane Irene driving much of the disease into our area in 2011, we have more if it than we can handle. A DMI + chlorothalonil application is the best medicine but keep in mind that this late in the season, it will probably hold on until we get a good frost. Slow release granular N will also help turf grow out of the disease (neutral pH, acidifying fertilizers will exacerbate the disease) once the plants get some breathing room following the fungicide application.  And in many cases, the best solution may be to start overseeding now with bent or KBG.

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