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Plum tree infestation #461645

Asked June 12, 2018, 12:54 AM EDT

This year our plum tree has not produced any fruit. It has shriveled leaves and I have noticed insects flying from branch to branch - see photo. I have also noticed quite a few ladybugs. Ideas?

Multnomah County Oregon

Expert Response

Leaves on trees curl if heavily infested with aphids. Ladybugs and their larvae feed heavily on aphids, so that's another clue. I'm guessing you have aphids. Look at some leaves closely. It helps to uncurl a few over a piece of paper, and have a hand lens or magnifying glass to look closely at the leaf undersides.
Usually there are live aphids, cast skins, and possibly some aphids with wings. Look for ladybug larvae also (internet search so you recognize them).
Let us know what you find. It is too late to heal these leaves, and possibly treatment will need to wait for early next spring. I'm not sure yet.
Is this a tree you could treat, or would you hire a tree service if spraying is required?
Here are links to a couple of pages from the Pacific Northwest Pest Management Handbook from the Extension Service. It includes life cycle and home management, cultural options.


Jacki D., Master Gardener Diagnostician Volunteer (Washington, Multnomah and Clackamas Counties) Oregon State University Extension Service Volunteer Metro Master Gardeners (http://metromastergardeners.org/) Replied June 13, 2018, 11:00 AM EDT

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