Ask a Question forum: What type of pest is this?

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Name: Alyssa Blue
Ohio (Zone 5b)
Bloom where you're planted
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AlyssaBlue
May 12, 2016 4:10 PM CST
From afar, it looked like some red flowers blooming, but there is obviously a problem! This pest is on two trees, but they are not next to each other- they are about 20 feet apart. Does anyone know what it is? Maybe a type of caterpillar? (And how to treat it?)
Thumb of 2016-05-12/AlyssaBlue/d5536b

Name: Sue
Ontario, Canada (Zone 4a)
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sooby
May 12, 2016 4:21 PM CST
The picture is a bit fuzzy but they look like galls. What trees are they on?
Name: Alyssa Blue
Ohio (Zone 5b)
Bloom where you're planted
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AlyssaBlue
May 12, 2016 5:01 PM CST
A cherry and an apple, I consider them wild because we did not plant them and they are on the edge of woods. I agree I think you are correct- the bark is also affected on the apple tree, which has not been doing well anyway. Last year the apple had gypsy moth, this year it doesn't as far as I've seen.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
May 12, 2016 5:32 PM CST
This is a picture of spindle gall on Prunus (caused by an eriophyid mite):

http://www.extension.umn.edu/garden/diagnose/plant/deciduous...

On a quick look I didn't find a reference for the same thing on apple but most references to galls on apple are for more serious problems than this type of gall. In general galls like these spindle galls don't cause any real problems for the tree.

Not sure what might be affecting the bark on the apple, I presume it's not exactly the same thing?

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