Will this work for lady bugs

Ladybugs are not typically attracted to yellow, which is the main attractant in this product. If a ladybugs ends up on the product, however, it will get stuck. Thank you for choosing Catchmaster!

Do you think this will attract and harm the bees in my garden as well as the flying pests?

I have never seen a bee come near them or get stuck on them.

Will these attract and trap the walnut husk fly?

I used it for white flies. Most flying insects were attracted to the yellow color. I would think it would work.

Will this be good for a fruit fly problem in a house? No plants.

Yes, that is what we bought them for. We had purchased new dirt for some plants both inside and outside in the garden. It turns out the gnats, or fruit flies, or whatever, came with the dirt. These sticky pads attract them and they cannot get free. The ultimate goal for the garden is to cover it when the growing season is over and kill them in the dirt. For the inside plants, that's not option without repotting them with dirt without the flies.