Bugs eating my trees!

jelleroJuly 1, 2014

what is this? they are all over my elm tree plus one apple tree has some yellow leaves with black spots, some dry leaves. another apple has wooly aphids and one cherry has black aphids. i am handling the last two with high pressure water spray but i have no idea what the critter in the pic is. i just ordered the economy size neem oil. suggestions?
thanks, john

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jtburton

Elm Leaf Beetle (see link)

Here is a link that might be useful: Elm Leaf Beetle

    Bookmark   July 2, 2014 at 8:35AM
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milehighgirl(CO USDA 5B/Sunset 2B)

I had a similar problem on a Siberian elm and was referred to this product by a member here from Denver who works for the city forestry division. It worked extremely well and installation was easy. It is not cheap but it is well worth it to have a healthy tree. It is systemic injected into the trunk so it won't affect the trees around it by over spray or through the soil.

I would contact the mfg about using the product at this time of year. I believe it is far more effective when the sap begins to flow in the spring. You may have to wait until next year.

Here is a link that might be useful: ACECAP® Systemic Insecticide Implants

    Bookmark   July 2, 2014 at 9:42AM
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jellero

thanks. the pic i posted didn't make the trip here well. the bug is bright black and yellow, maybe 1/4" long, the larvae 1/8" to 1/4" today and growing. there are 1-3 on each leaf and the tree is 30' high. my sprayer shoots maybe 5'.
i have seen small little beetles in my house though that have two stripes down the back... i took one to the local colorado extension and was told they would be sent to ft. c for an i.d. and i never heard from them. these bugs leave just the framework of the leaves. i don't like elms but this one sneaked in with the poplars and was blocking the views of my neighbors so was welcome. they grow tall and die. kind of worthless actually. i am worried about my apples and cherries though. j

This post was edited by jellero on Fri, Jul 4, 14 at 12:56

    Bookmark   July 4, 2014 at 11:45AM
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jellero

that is one bug and it is is on my other tree and the one across the road... but there is also a black larvae on the leaf, wtf? is that just a younger version?? john

    Bookmark   July 4, 2014 at 8:05PM
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milehighgirl(CO USDA 5B/Sunset 2B)

Unless your elm is a Siberian elm you will want to get rid of it. The Siberian are not susceptible to Dutch elm disease. Most seedlings around here are Japanese and not worth keeping. Just cut it down and if you replace it, replace it with a tree that is hardy enough for this zone. Personally I hate cottonwood and ash. They grow fast and then get damaged by early or late snows; when they die you've got a hefty bill to remove them.

    Bookmark   July 5, 2014 at 3:52AM
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