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Plant Diseases and Disorders of Lawn Grasses, Trees, Vegetables,and Ornamentals

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Plant Diseases Identification and Management


B.S. Botany --- Miss. State Univ. M.S. Plant Pathology --- Miss. State Univ. Ph.D. Plant Pathology --- Texas A & M Univ.

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Recent Answers from Dr Stephen Vann

2016-10-14 Brown spot, scale, or something else?:

Sherry:    If these spots were scale insect,they should be raised somewhat and can be removed by gentle scraping them with your fingernail.    If the spots were fungal or bacterial in nature,they would

2016-08-18 Splitting Bark on ornamental Maple:

Robert:    Your photos represent damage done to the bark.  These splits may be mechanical or weather related. On thin barked trees such as many maples, frost/heat cracks can develope as a result of weather

2016-08-07 Firespike yellowing leaves and growth:

Hi Sherry!    Leaf yellowing/stunting is often associated with a root/soil related stress.  This could be several things including as you said fertility and/or moisture imbalances or even an infectious

2016-07-20 Rose of Sharon (trained to look like a tree):

Randy:    If further clarification is requested on the identification of these spots, please send along a photo.  Try to get as close as you can to take the shot.  Take several and send the best one. Be

2016-07-08 Pistachio Disease:

Jim:    From your image,this is feeding sites of a woodpecker. Often,it is the yellow bellied sapsucker. Very common on many trees such as pecan and some ornamental shrubs. Usually the tree can tolerate


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