Leaf Spot Look-alikes

| No Comments | No TrackBacks

Posted by Pete Landschoot


Diseases of Aug 2009 021.jpgAugust 2009 010.jpg











Click on photos to enlarge


If you're seeing brown spots and melting-out on your ryegrass of late, keep in mind that there are other late-summer leaf spot diseases of perennial ryegrass besides gray leaf spot.  I recently observed a case in central PA in which a contractor suspected gray leaf spot was taking out his newly-seeded perennial ryegrass.  In fact, the disease turned out to be a different leaf spot disease.  The spores appeared similar to descriptions of Drechslera siccans.  For the record.....I was fooled as well.  I could have sworn it was gray leaf spot when I looked at the turf in the field.  When garden-variety leaf spot diseases get rolling on susceptible hosts during extended periods of high humidity, they can resemble early stage symptoms of grey leaf spot.  Some common leaf spot diseases of perennial ryegrass include net blotch and leaf blight (Pyrenophora dictyoides (sometimes referred to as Drechslera dictyoides); Leaf spot, leaf blight, and foot rot (Drechslera siccans), and leaf blight and crown rot (Drechslera catenaria).   Only your diagnostician....using a microscope.....knows for sure. 



No TrackBacks

TrackBack URL: https://blogs.psu.edu/mt4/mt-tb.cgi/75754

Leave a comment

Subscribe

Enter your email address:

Delivered by FeedBurner

Powered by Movable Type 4.24-en

Categories

About this Entry

This page contains a single entry by ANDREW SCOTT MC NITT published on August 19, 2009 4:01 PM.

Research to Help Turfgrass Grow Well into Fall/Winter was the previous entry in this blog.

Walker Cup's other stars: The greenskeepers is the next entry in this blog.

Find recent content on the main index or look in the archives to find all content.