Top Questions About Plum Trees

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Questions About Plum Trees

Asked by
hotpaul444 on
August 13, 2011

Q. Plums Have Maggots

Why have my Victory plums got maggots in them, and how can I prevent this next year?

Answered by
Heather on
August 17, 2011
Certified Expert
A.

They are likely apple maggots, which can actually affect most tree growing fruit. This article describes how to control it on apple trees, but the methods are the same for all fruit trees: http://www.extension.umn.edu/distribution/horticulture/DG1007.html

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Asked by
Anonymous on
August 19, 2011

Q. Plum Tree Oozing Sap, Etc.

My 10-year-old plum tree had several limbs that did not leaf out. There was flaking bark at the junction of limbs and trunk, and on larger limbs and branches. There is also oozing sap and cracks on the lower trunk. Branches facing east have produced a good crop of plums. Branches facing west, which include the ‘dead’ (?) ones have little or no fruit. My apple tree has the same flaking bark symptoms but looks very healthy and has produced a good crop. Any suggestions for treatment?

Answered by
Nikki on
August 20, 2011
Certified Expert
A.

It might be bacterial wetwood or peach borers or canker, depending on how the sap looks. These articles will describe the nature of the running sap for each problem and will suggest solutions:
https://www.gardeningknowhow.com/ornamental/trees/tgen/wetwood-bleeding-trees.htm
https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-borer.htm
http://plantclinic.cornell.edu/factsheets/treecankers.pdf

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Asked by
judi4407 on
September 4, 2011

Q. Plum Tree

Plum tree did not produce or hold what litte fruit on tree to maturity. Leaves are turning brown with holes and some are skeltonized. I think it was tent worms that engulfed one whole branch and have seen Japanese beetles. There is also an area on a large branch that looks like there is sap coming out of it. I just want to get my tree back to good health, if possible. Thanks for any information you can give me. Judi

Answered by
Heather on
September 5, 2011
Certified Expert
A.

Japanese beetles will do the damage you describe. This article will help with getting the Japanese beetles under control:
https://www.gardeningknowhow.com/plant-problems/pests/insects/japanese-beetles.htm

I would also get the tree on a regular spray schedual for pests and fungus. This article will help you with that:
https://www.extension.iastate.edu/Publications/PM1282.pdf

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Asked by
Anonymous on
September 21, 2011

Q. Resin Or Gum Leakage

My plum tree has big globs of gum or resin seeping from the bark. What is causing this?

Answered by
Nikki on
September 22, 2011
Certified Expert
A.

It sounds like you may have peach borers, which also affect plum trees. This article will help you with that: https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-borer.htm

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Asked by
Ernest on
November 29, 2011

Q. Plum tree

I have a plum tree in my backyard. It is very old and hardly bears any plums but it gives good cover in the summer. It is covered with a silver hairy disease that is very hard to kill or remove. The birds nest in it and they carry the spores on to my concrete tile roof. The roof is covered in this silver cobweb effect spore and is very hard to remove. I cannot jet spray it off, as it will cause leakage in the tiles. Is there a product that will kill this disease? I have had it sprayed by professional sprayers but it still remains.

Answered by
Heather on
November 30, 2011
Certified Expert
A.

It sounds like it may be a form of lichen. Regular applications of fungicide should clear it up. This article may also help:
https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm

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Asked by
bgcg on
March 17, 2012

Q. Plum trees

I have 2 plum trees that I planted last year. I just checked them and they have a split in the branches that I believe to be a canker (fungi). What shold I do? The dormant oil that I use on my apple trees does not list plums on the lable.

Answered by
Heather on
March 23, 2012
Certified Expert
A.

The dormant oil you have should be fine for the plum tree. I can't say 100 percent for sure, because I don't know exactly the brand you are using, so you may want to call where you bought it at and ask a nursery worker to confirm that it is safe for plums.

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Asked by
marygl on
May 21, 2012

Q. What can I do to save Flowering Plum tree?

I was away last summer. Upon returning, I found tree was almost totally dead. Sap was oozing on branches. Leaves died but did not fall. New growth this year from top of trunk and a few branches. I now see some of the new growth is dying. I just cut back some of the dead branches. Tree is about 25′ high and 30 wide. Should I continue to cut back and what can I put on it?

Answered by
Heather on
May 26, 2012
Certified Expert
A.

This is either caused by borers or by a canker. In both cases, if the tree is badly far gone, then it would be more beneficial to you to replace the tree rather than trying to save it. If you can get the tree to recover, it will take years to recover its former state. Better to start clean and get there with a fully healthy tree.

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