I haven't heard about this before but I think one cup is not enough. If I still had my garden I would place Vaseline covered cups everywhere to see how well it works. Make sure and put them out early before aphids infest the plants. I believe this photo is from a mock orange. Aphids would always end up on the mock orange every year.
No, but I will try, also! Then again, all you early-climate gardeners will get to report your results before I will need it
Never heard of this before, but now I know! Thanks!
New one for me. Worth a try.
New one for me too but worth the sacrifice of a yellow cup, a stake and some vaseline.