| Subject | Date Asked | Expert |
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| white rice looking things on all leaves of gardenia plant | 11/4/2009 | Dr 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 ...
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| gnats | 11/4/2009 | kathy 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 ...
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| brown spots on maple leaves | 11/4/2009 | Jim 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 ...
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| green growth on maple tree trunk | 11/4/2009 | Jim 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 ...
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| Black Knot on Cherry Trees | 11/3/2009 | Jim 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 ...
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| junipers & boxwoods | 11/3/2009 | Dr 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 ...
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| mold in and on soil | 11/3/2009 | kathy 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 ...
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| emerald arbovitaes disease? | 11/2/2009 | Dr 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 ...
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| boxwood problems | 11/1/2009 | Dr 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 ...
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| junipers & boxwoods | 10/31/2009 | Dr 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 ...
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| Cleveland Pear in trouble? | 10/30/2009 | kathy 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 ...
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| junipers & boxwoods | 10/30/2009 | Dr 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 ...
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| emerald arbovitaes disease? | 10/29/2009 | Dr 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 ...
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| Arborvitae Damage | 10/29/2009 | Jim 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 ...
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| Winterberry | 10/28/2009 | Dr 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 ...
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| Fox Tail Palm Diease? | 10/28/2009 | Dr 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 ...
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| Mimosa Wilt | 10/27/2009 | Jim 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 ...
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| New Bradford Pear tree dying? | 10/26/2009 | Dr 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 ...
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| Ivy | 10/26/2009 | Dr 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 ...
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| Oak tree damage | 10/26/2009 | Dr 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 ...
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| Fruitless Mullberry | 10/26/2009 | Dr 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 ...
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| pin oak tree | 10/25/2009 | Dr 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 ...
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| Honey Locust Tree | 10/25/2009 | Dr 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 ...
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| Foxtail palms | 10/25/2009 | kathy 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 ...
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| Blue Plum Tree | 10/25/2009 | Dr 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 ...
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| yellowwood tree | 10/25/2009 | Dr 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? ...
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| yucca plant has black sap seeping out | 10/25/2009 | kathy 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. ...
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| Magnolia leaf disease | 10/25/2009 | kathy 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 ...
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| Magnolia Tree Leaves Wilting | 10/24/2009 | Dr 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 ...
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| Oak tree damage | 10/24/2009 | Dr 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 ...
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| Jacaranda tree weeping | 10/24/2009 | Dr 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 ...
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| lemon tree disease | 10/23/2009 | kathy 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 ...
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| Lime and Lemion Trees | 10/22/2009 | kathy 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 ...
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| Ivy | 10/22/2009 | Dr 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 ...
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| African Sumac Tree | 10/21/2009 | kathy 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 ...
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| Algae Growth | 10/20/2009 | Dr 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 ...
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| Crape Myrtle - disease | 10/20/2009 | Jim 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 ...
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| Lilac Tree | 10/20/2009 | Dr 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 ...
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| Lilac Tree | 10/20/2009 | Dr 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 ...
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| lilac bush | 10/20/2009 | kathy 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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