That looks like a stink bug but I have never seen a black one.
That looks like a mite of some sort and they are DIFFICULT to get rid off. You said they were in the "small folds". Do you mean in the bark or somewhere else on the tree. Most mites, depending on where they are, are most times fought with some type of oil, usually either Neem Oil or horticultural oil, but the tree must be dormant. We need to know exactly where these bugs are located. Also, a better-focused picture would help.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.
|What's this bug? I found a couple of in house. Is it bad or good? Thanks||5|
|mass Mealy bug treatment for a greenhouse full of plants||2|
|Samurai Wasp targets Stink Bugs||0|
|Luxury Bug Hotel||2|
|What are those tiny white bugs in compost pile? Thanks.||4|
|White eggs? by bugs||5|
|Tiny White bugs flutter away when trimming Cucumber plant.||1|