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Leaf Gall Mites
Odd growth on leaf surfaces.
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Dubyadee
Puyallup, Washington, USA
248 Posts
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July 4, 2021 - 6:45 pm
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CADDF589-EBC0-4233-8921-6E417CE7224E.jpeg5F5F3501-0267-45EC-BA28-A2EEFB966496.jpegI found plum leaves in North Dakota with odd growths on them. The growths appear as though they are some sort of cocoon but are actually deformed growth caused by the tree’s reaction to gall mites feeding on the leaves. I have seen this to a lesser degree in my own yard in Washington. 

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John S
PDX OR
3026 Posts
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July 5, 2021 - 8:58 pm
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Great visual image, WD.

I think a lot of people have no idea what is affecting their trees until they see a clear picture like this one.

John S
PDX OR

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jafar
885 Posts
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July 6, 2021 - 9:59 am
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I thought the pear rust structure was nasty.  That looks really disturbing.  I might have to cut that all off and burn it just for peace of mind.

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Dubyadee
Puyallup, Washington, USA
248 Posts
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July 30, 2021 - 12:34 pm
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I found galls on Lombardy poplar leaf stems in Puyallup. Apparently caused by aphids. The gall is a spiral with small chamber where the aphids live. When you tug on the stem  the gall uncoils. B0DDFDA1-42F0-481A-9132-A2E2F241AF42.jpeg02050016-BDE4-4B5F-8E61-225B7185F2B5.jpeg4C6FF88E-F30A-4BC4-A201-B473D97D58C5.jpeg

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John S
PDX OR
3026 Posts
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July 31, 2021 - 8:18 pm
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Excellent visual explanation, WD.

John S
PDX OR

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Dubyadee
Puyallup, Washington, USA
248 Posts
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September 4, 2022 - 5:35 pm
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I found a new pest on my Seigerebe grape leaves. I believe that they are grape leaf blister mites. The top surface of the leaves have raised blisters and the bottom side has silk patches, like spider egg sacks. I do not see any of these pests on my seedless table grapes - interlaken, glenora, etc. 

E61FBF9D-8210-45D8-BBED-FB15850099E8.jpeg

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