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Keyword Search Results for:
Oak Tree

4 Found

Question: 848-4512
My oak tree has been dropping leaves suddenly. Most of the leaves have been eaten by something. The leaves first had black bubbles on them and then there was a web of veins with nothing in-between. What happened? Nate, Verdun, IL

Mort's Answer:
When trees get one malady, they become prone to other infestations. Black tar fungus starts out as a gray mold under the leaves and grows through the leaf. It turns black on the top of the leaf. Japanese beetles will create that webbed appearance as they eat those moldy leaves. You need to cart away those fallen leaves to the dump to eliminate the prospect of reappearance of the fungus next year. You should put out pheromone traps to collect the beetles before they lay eggs in the lawn. Apply grubicide to the lawn to get the eggs that will be developing in the lawn.

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Question: 1000-3413
Our 100 year old oak tree is dropping small acorns now. What can I do to stop this? Gray, Norwich, CT

Mort's Answer:
Not much can be done unless your want to spray with an insecticide. If you are not harvesting those acorns then I would just leave them with the premature dropping. You can sweep them up now instead of later. Your 100 year tree will outlast this malady as it has with other disturbances in its past. A few years ago oak trees were dropping entire branches in a drought to protect itself.

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Question: 1172-4014
My large oak tree had very small leaves this year. A tree company said it should be removed. They cut off a dead limb but there are no signs of disease or pests except lichen all over the tree. Suggestions? Mary, Norwich, CT

Mort's Answer:
Because of your shallow water table and the light rain this year in southeastern New England, I suspect that this is the reason for the small leaves . Generally lichen will not kill a the unless disease is prevalent. Lichen starts out as algae on the north side of a plant. A fungus will grow in the algae. Lichen has been prominent the past few years in Nw England. It can kill smaller plants like azalea. I would find an arborist with spray equipment and a license. A good fungicide like benolate or the organic Bordeaux Mix will arrest the fungus. You will probably need two or more sprays before the lichen disappears.

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Question: 1431-2317
It seems that last year many Oak trees were damaged by gypsy moths. Will they survive this years onslaught? Peter, Preston, CT

Mort's Answer:
Researchers at URI have been quoted as saying that continual rain in June will help create the fungus that will kill the critters. In the meantime we need to continue attacking them by using straps near the base and traps on the trees to catch the invaders. We could see a reduction in our forests of 25% of hardwoods this year. Solid stands of oak as opposed to pine oak combinations and others are most vulnerable. Hopefully the fungus, Entomophaga maimaiga, will have already started to kill off these migrating hordes that keep popping up from year to year.

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