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Two different pest/diseases to identify, please. #873953

Asked June 20, 2024, 3:00 PM EDT

Can you please help me identify to different situations I have going on? The first two photos are of the same leaf. It's a weird, white substance on the tops of the leaves of some alder(?). The last photo is of an orange substance on some wild rose leaves. I also have something eating my wild raspberries and I'm having a really hard time seeing any pests. While I've been searching for Aphids and things, I've only run into a few Sawflys and lots of Bumble Bees. I was wondering if the orange substance has something to do with the raspberry leave eating culprit. :)

Fairbanks North Star County Alaska

Expert Response

Hi Shelley,

Thanks for the great questions!  Sorry for the delayed response, I was out in the field all last week. The first two photos look like they could be galls formed by some kind of insect but I am sending the photos on to some entomologist colleagues to see what they think. The third photo is rust caused by a fungus, which is very common (and normal) for the wild roses in Alaska. I don't think it is likely contributing to your raspberry problems. If you want to send me some pix of the damaged raspberry plants/leaves I can take a look at them. I will let you know if I hear anything more about the alder leaves.

Thanks!
Gooseberry Peter Replied June 24, 2024, 7:01 PM EDT
The entomologist says the tree leaf damage is due to Eriophyid mites.
Gooseberry Peter Replied June 24, 2024, 7:22 PM EDT

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