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About Dr Stephen Vann
(Top Expert on this page)

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

Experience
Plant Diseases Identification and Management

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

   

You are here:  Experts > Home/Garden > Roses > Plant Diseases

SubjectDate AskedExpert

white rice looking things on all leaves of gardenia plant11/4/2009Dr Stephen Vann
  Q: I brought the plant for the winter and it has developed in a short period of time this white rice ...
  A: It's getting about that time of the year to bring the plants in off the deck or porch. We have ...
gnats11/4/2009kathy crowley
  Q: I have New Guinea Impatiens that I brought into the house for the winter about a week ago. The soil ...
  A: sounds like white flies as they are small and scatter when you move the plant. I sould suggest ...
brown spots on maple leaves11/4/2009Jim Hyland
  Q: I live near Philadelphia and have an almost 30-year-old maple tree in my backyard. This fall I have ...
  A: These are leaf spot caused by a fungus. I am going to guess it is Phyllostict leaf spot. A leaf spot ...
green growth on maple tree trunk11/4/2009Jim Hyland
  Q: I live near Philadelphia and have a treasured maple tree in my backyard that has a fairly heavy ...
  A: These are lichens. Lichens are an example of a symbiotic relationship between algae and certain ...
Black Knot on Cherry Trees11/3/2009Jim Hyland
  Q: My wife and I have a 7 acker lot on a lake in Northern Minnesota. A summer place and we will be back ...
  A: Black knot can be managed by pruning out and destroying all galls infecting the tree. Prune trees ...
junipers & boxwoods11/3/2009Dr Stephen Vann
  Q: I will try to explain as best as possible; firstly we recently moved into a new home that already ...
  A: Eileen: Good Morning! A bit too cold for me where you are. Tonight here- 40's w/clear skies. Highs ...
mold in and on soil11/3/2009kathy crowley
  Q: Ok im not going to candy coat this so please do not get offended . I grow medical marajuana for ...
  A: Mold is a by product of excessive moisture due to lack of sunlight, air, over watering etc... in ...
emerald arbovitaes disease?11/2/2009Dr Stephen Vann
  Q: Dr. Van We have 19 emeralds I am very concerned about.Much like Trish we have a golden/orange ...
  A: Jim: Just keep an eye on them. Browning/bronzing foliage on the inside is a normal event this time ...
boxwood problems11/1/2009Dr Stephen Vann
  Q: I planted three boxwoods about 2 months ago. Purchased from a very reputable nursery. The leaves on ...
  A: Ellen: From your description, this doesn't sound like a normal thing. This discoloration may be ...
junipers & boxwoods10/31/2009Dr Stephen Vann
  Q: I will try to explain as best as possible; firstly we recently moved into a new home that already ...
  A: Eileen: I'd suggest not replacing the junipers until you can determine their health status- maybe ...
Cleveland Pear in trouble?10/30/2009kathy crowley
  Q: We bought a Cleveland Pear about 2 months ago (late August) and planted it immediately in our ...
  A: I would turn off the hose. The tree is resistant to droughts, which means you do not have to ...
junipers & boxwoods10/30/2009Dr Stephen Vann
  Q: I will try to explain as best as possible; firstly we recently moved into a new home that already ...
  A: Eileen: Junipers prefer well drained soils. Excessive soil moisture can lead to comlicated root ...
emerald arbovitaes disease?10/29/2009Dr Stephen Vann
  Q: Dr. Van We have 19 emeralds I am very concerned about.Much like Trish we have a golden/orange ...
  A: Jim: I suspect that the change in color, especially if it is occuring on many of these plants is ...
Arborvitae Damage10/29/2009Jim Hyland
  Q: Our trees had some bagworms that did some damage. One of the trees is still brown on top...can we ...
  A: Yes the foliage should grow back from bagworm feeding. I would wait until next spring and see how ...
Winterberry10/28/2009Dr Stephen Vann
  Q: Steve here are some pictures of that winterberry with those black spots. thanks again Mike
  A: Mike: Thanks for the photo. This photo may suggest some type of fungus disease. There are a few ...
Fox Tail Palm Diease?10/28/2009Dr Stephen Vann
  Q: We have some foxtail palms that we planted 3 years ago. This year, we noticed that several of the ...
  A: Lois: I don't think this is an infectious/contagious situation. It may be related to a potential ...
Mimosa Wilt10/27/2009Jim Hyland
  Q: Most articles talk about Maryland and south. Any history of this disease occuring on Long ...
  A: Yes the disease is on mimosa trees where ever they will grow. The mimosa tree's native range is ...
New Bradford Pear tree dying?10/26/2009Dr Stephen Vann
  Q: I recently purchased 2 Bradford Pear Tree's. They are still in their plastic 20 gal. containers. ...
  A: Mary: Leaf browning may be due to root related stress. This can be, among other things lack of or ...
Ivy10/26/2009Dr Stephen Vann
  Q: Over the past few months the ivy outside my walk way has lost it's leaves and the vines are exposed. ...
  A: Judy: In most cases, the "root rots" are associated with the soil remaining wet or saturated for ...
Oak tree damage10/26/2009Dr Stephen Vann
  Q: I live in the panhandle of FL and have a young pin oak whose leaves are looking awful. They have ...
  A: Annette: Congratulations! It came through in flying colors. This is a very common fungus disease ...
Fruitless Mullberry10/26/2009Dr Stephen Vann
  Q: We have a fruitless mullberry tree that is 65 to 70 years old. It is beginning decay. Do you have ...
  A: Kathy: Unfortunately, there is not a magic bullet. The decay is often a slow, yet progressive ...
pin oak tree10/25/2009Dr Stephen Vann
  Q: We have a mature pin oak tree in our front year. This year, the bark has started to fall off, the ...
  A: Jeff: From your description, I would suspect that your tree may have some level of decay inside. If ...
Honey Locust Tree10/25/2009Dr Stephen Vann
  Q: For the first time ever, 20+ years, our two side-by-side honey locust trees have no seed pods. ...
  A: Michelle: If the tree seems and looks healthy otherwise, I'd sit tight and relax. Weather conditions ...
Foxtail palms10/25/2009kathy crowley
  Q: We have some foxtail palms that we planted 3 years ago. This year, we noticed that several of the ...
  A: You do not say where you live, could it have some freeze damage? Next though would be watering too ...
Blue Plum Tree10/25/2009Dr Stephen Vann
  Q: This Blue Plum tree is approx 15-20 years old. Blossoms and sets fruit then fruit seems to shrivel ...
  A: Phyllis: If the fruit seems to rot on the tree before it shrivels, this may be a disease called ...
yellowwood tree10/25/2009Dr Stephen Vann
  Q: We have a yellow wood tree we planted about 5 years ago, I believe it was about 10-15 years at that ...
  A: Angela: This may be some sort of insect. Can you take and send a closeup photo of this white stuff? ...
yucca plant has black sap seeping out10/25/2009kathy crowley
  Q: I have a question regarding my yucca plant. It is indoors, in a 14 inch ceramic pot and sits about 3 ...
  A: In bright or high light settings, allow the top 1/4 or 1/3 of soil to dry out before watering well. ...
Magnolia leaf disease10/25/2009kathy crowley
  Q: Ilive in the panhandle of FL and have a volunteer magnolia tree on which the leaves all seem to have ...
  A: It is typical for magnolia leaves to get scale and make them look awful. I am using a product ...
Magnolia Tree Leaves Wilting10/24/2009Dr Stephen Vann
  Q: We transplanted a 10 foot magnolia tree in March of this year. The leaves yellowed and spotted at ...
  A: Cath: Some occasional leaf drop isn't of too much concern, especially inner leaves. If you have ...
Oak tree damage10/24/2009Dr Stephen Vann
  Q: I live in the panhandle of FL and have a young pin oak whose leaves are looking awful. They have ...
  A: Annette: Can you send along a closeup photo of one or two leaves with the raised areas/spots? I have ...
Jacaranda tree weeping10/24/2009Dr Stephen Vann
  Q: I have two young jacaranda trees which were taken indoors before the frosts started. I forgot to ...
  A: Bob: The tree may have been stressed by (1) heated air currents and (2) light changes. Leaf drop can ...
lemon tree disease10/23/2009kathy crowley
  Q: I have a 10 year old dwarf Meyers Lemon. It's has been a super successful producer in this So Cal ...
  A: I would not use a systemic, as they are usually poison. However, I suggest Atomic Grow, that will ...
Lime and Lemion Trees10/22/2009kathy crowley
  Q: My lime tree does not give fruit. It will blossom and tiny fruit will form, and then fall off. ...
  A: It could be two problems, one a fungus in the blooms or two an imbalance inside the plant. The ...
Ivy10/22/2009Dr Stephen Vann
  Q: Over the past few months the ivy outside my walk way has lost it's leaves and the vines are exposed. ...
  A: Judy: What type of ivy do you have? Did the leaves have any spots before dropping? Was anything ...
African Sumac Tree10/21/2009kathy crowley
  Q: I have an African Sumac tree that is around three years old. This past week I noticed one of the ...
  A: Sounds like it was hurt in some way as you should have one main trunk and all other should be cut ...
Algae Growth10/20/2009Dr Stephen Vann
  Q: I am doing a science project for school and was wondering if you could help me. If you can, please ...
  A: Charlie: Very good questions, unfortunately my background is primarily plant diseases and I don't ...
Crape Myrtle - disease10/20/2009Jim Hyland
  Q: I have several mature crape myrtles in my front yard (morning to noon sunlight) which have a black ...
  A: It sounds like sooty mold, which is a fungus that grow on honeydew. Honeydew is high on sugar ...
Lilac Tree10/20/2009Dr Stephen Vann
  Q: My tree is losing it's leaves at a fast pace. The leaves have spots and look dead on the tree. ...
  A: Leaf drop can be a common response to stress, especially when it originates in the roots. Your tree ...
Lilac Tree10/20/2009Dr Stephen Vann
  Q: My tree is losing it's leaves at a fast pace. The leaves have spots and look dead on the tree. ...
  A: Judy: Can you take and send a closeup photo of a leaf or two with the spots? Review photo on your ...
lilac bush10/20/2009kathy crowley
  Q: HELP - I have 5 Lilac bushes; 2 have while chalkey film on the leaves - i wash them & it returns - ...
  A: Sound like the location, maybe getting less water than the others, maybe a different fertilizer used ...

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Questions by
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kathy crowleyDr Stephen VannJohn Cawly
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