Monthly Archives: May 2011

Southern Bacterial Wilt of Tomato: Samples Wanted

Southern bacterial wilt is a major problem on tomato in Louisiana. The disease is caused by the soil-borne bacterium Ralstonia solanacearum, and symptoms usually develop in late spring or early summer once the weather warms up.  The most obvious symptom is the sudden (seemingly … Continue reading

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Disease Du Jour (May 10, 2011)

Received these photos of leaf mold on tomato from Kenny Sharpe in Livingston Parish. This disease is caused by the fungus Fulvia (Cladosporium) fulva and is typically more of a problem on greenhouse tomatoes or transplants coming out of the greenhouse … Continue reading

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Citrus Post-Harvest Fungicide Now Registered in Louisiana

Graduate A+, a combination of the fungicides fludioxonil and azoxystrobin, is now registered for use in Louisiana as a post-harvest fungicide treatment on citrus.  As part of the federal quarantine for Sweet Orange Scab, all citrus fruit being shipped out of the quarantined … 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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