Tag Archives: ornamentals

A New Boxwood Blight in the U.S.

As if boxwoods didn’t have enough problems already with diseases caused by Phytophthora and Volutella, a new boxwood blight, caused by the soilborne fungus Cylindrocladium pseudonaviculatum (= Cylindrocladium buxicola), was confirmed on nursery plants in North Carolina last month. It was subsequently found in a nursery in … Continue reading

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Disease Du Jour (May 9, 2011)

Received this photo of what appears to be powdery mildew on Sedum from Bobby Fletcher, Jr.  This disease is quite common in nurseries and unlike most powdery mildews on other hosts, very little mycelium is present and is usually only visible with the … Continue reading

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Disease Du Jour (April 20, 2011)

I’ve heard that azalea leaf gall is quite prevalent in the Feliciana parishes this spring.  Some people considered these galls to be unsightly, but I guess that a matter of personal perception.  The fungus that causes them,  Exobasidium vaccinii, only invades the young expanding leaves during … Continue reading

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Entomsoporium Leaf Spot Is Active

Received the photo on the left from Al Orgeron in St. James Parish of Entomosporium leaf spot that showed up recently on red tip photinia. Also had some show up recently on my Indian hawthorn at home. There’s still time to spray to … 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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Outlook Bleak for the Control of Bacterial Diseases of Ornamentals

The search for new products to aid in the control of bacterial plant pathogens on ornamental crops continues to look unpromising. IR-4 just released the results of efficacy tests of potential control products. Their summary follows:  “During 2008 and 2009, 45 … Continue reading

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Welcome to the Louisiana Plant Pathology blog

This blog is intended as means of keeping county agents and other interested parties informed about current diseases affecting horticultural crops in Louisiana and other issues related to plant pathology that may be of interest to them. The information presented is intended for … Continue reading

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