First of all, my apple tree is young, just about two feet tall. More importantly my apple tree is on my porch in a pot, and it's been there for at least, say, a month or two. Also, on my porch ceiling there are about 4 wasp nests of at least 3 different types (red ones, yellow and black ones, and small ones). They haven't ever stung, or even bothered, anyone, or any of my plants, including my other two much younger apple seedlings.
Recently, just this week, there has been one wasp (of either the red or the black and yellow kind) that has been sitting or moving back and forth on my oldest apple tree's leaves each day. it doesn't 'seem' to be doing anything bad to my apple tree, and it hasn't touched any of my other plants, but it won't go away and I'm not sure what to do about it.