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Disease Sightings

April 12, 2000

The Plant Clinic is not yet open, but we have had reports of various diseases already this year. Chalk it up to the less than normal spring. Look for the following diseases that may be occurring in your area now: Dothistroma needle blight of Austrian pine, Rhizosphaera needle cast of spruce, Sphaeropsis tip blight of pine, cedar-apple rust on red cedars, and black knot of plum. All these diseases were readily visible; but, in all cases, infection started last year. These are not new infections. New sporulation was just beginning. As you observe the year’s new foliage, also keep an eye out for diseases. They are here!

Author: Nancy Pataky


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