Tag Archives: tree diseases

Powdery Mildew Blighting Crape Myrtles Now

Powdery mildew, caused by the fungus Erysiphe lagerstroemeriae, is once again wreaking havoc on the blooms of susceptible crape myrtle varieties. The warm, humid weather during late spring and early summer has been ideal for disease development on plants in partially … Continue reading

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Armillaria abundant now

Received this photo of Armillaria from Bob Souvestre in East Baton Rouge Parish this morning.  Tentative identification from Dr. Cathie Aime, our mycologist, is that it’s most likely Armillaria tabescens, which has been fruiting rather profusely in the area the last couple of days. This fungus is … Continue reading

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Laurel Wilt Continues to Move West

Laurel wilt, a devastating disease of red bay and sassafras trees that is transmitted by the red bay ambrosia beetle, was found recently in Panama City in the Florida panhandle. Initial symptoms of laurel wilt are a reddish or purplish discoloration … Continue reading

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Diseases in the News: Thousand Cankers Disease Found in Tennessee

The Thousand Cankers Disease (TCD) of walnuts, particularly black walnuts, that was previously thought to occur only in the western U.S., was recently found near Knoxville, Tennessee. Based on the relatively widespread distribution of the disease in the surrounding area and … Continue reading

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Disease Du Jour (August 12)

Today’s disease photos come courtesy of Stuart Gauthier in Vermillion Parish. Several Chinese elms in a landscape bed had died suddenly, and when the bark was removed from the base of the tree, white fungal mycelium that is typically associated … Continue reading

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Disease Du Jour (July 12)

To get the week off to a good start our “disease du jour” comes to us courtesy of Russell Harris in Orleans parish. This is oak leaf blister caused by the fungus Taphrina caerulescens. The disease develops on a wide variety of oaks … Continue reading

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