Tag Archives: landscape tree problems

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 8)

Today’s disease photo comes courtesy of Dr. Dale Pollet. This is foamy canker (or alcoholic flux), a disease that occurs on a number of tree species, but is most commonly seen on elm, oak, sweet gum and Victorian box. The white … Continue reading

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