I recently noticed a problem on my spinach plants with leafminers--while I was squashing all of the leafminer eggs, I noticed that there were little yellow things crawling around on the leaves, that looked a lot like the green aphids I had last year on my strawberry plants, except they were a yellowish orange color. and these ones were really fast, and even appeared to jump away when I tried to squash them (unless they were just coincidentally falling off the plant???) I looked at some photos on the internet, and think they might be milkweed aphids. I am wondering if these things are going to be much of a problem? I've inspected some of my other plants, and noticed them also on my romaine and buttercrunch lettuce plants. But have not noticed any problems on the leaves regarding the shape or growth of them.

Also, do you know if spinach leafeminers will invade my lettuces or tomatoes also?

Thanks,

Michelle