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Leaf Roll in Tomato
Once again we’re seeing quite a bit of leaf roll in tomatoes this year. This is a physiological problem that has been attributed to a number of causes, including excessive nitrogen, excess moisture and...
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Sclerotinia Diseases in the Vegetable Garden
Last week was our annual tour of commercial vegetable growers in West Feliciana Parish. AgCenter personnel and several of the commercial growers met and spent the morning touring the various growers’...
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Impatiens Downy Mildew Makes Its First Confirmed Appearance in the Louisiana...
We had our first confirmed report of downy mildew on Impatiens walleriana here is south Louisiana this weekend. My wife commented that one of the double impatiens that she’d gotten at one of the big...
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Gummy Stem Blight of Watermelon
Visited a couple of commercial watermelon producers in Washington and Tangipahoa Parishes with Henry Harrison last week. Poor pollination early in the season has been the major problem in the area due...
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Impatiens Downy Mildew Update
Downy mildew was observed on Impatiens walleriana in a residential landscape in New Orleans today. The affected plants had been purchased at a “big box” store in the area, but it was not the same chain...
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Cucurbit Downy Mildew 2012
We have yet to see downy mildew on cucurbits here in Louisiana this year, but it was recently reported on cucumbers in Baldwin County, Alabama, which is east of Mobile Bay. Growers, especially those...
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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...
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Fig Rust Causing Early Defoliation
Fig rust, caused by the fungus Cerotelium fici, is already causing defoliation of fig trees in parts of southern Louisiana. This is considerably earlier than normal, but this spring’s abundance of...
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Cercospora Leaf Spot of Hydrangea
Received these photos of Cercospora leaf spot on hydrangea from Gerald Roberts, county agent in Lafayette Parish. This disease is caused by the fungus Cercospora hydrangeae, which reproduces on...
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Gaura Rust
Gaura lindheimeri is a plant native to southwestern Louisiana and Texas that is becoming increasingly popular as a landscape plant because it is a sun-loving, summer-flowering perennial that once...
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