what pest could be causing this!

I've noticed a milky substance on my shrubbery, sunflowers and cosmos. Does anyone have any idea what bug could be causing this problem?

Thanks, Deborah

I found a tiny white bug (white fly? mealy bug?) that has feathery wings on the infested plants. What is it and how can I get rid of them without killing my swallowtail caterpillars?

Try dish soap, not sure if that will kill the caterpillars though. It's the least destructive thing I can think of. Oil soap stays around long but try the dish soap in a sprayer.

A shot of water with the hose is even less damaging to beneficials.

Is your milky stuff foamy?

It could be spittle bugs.

GGG

Thanks to all for the soap tip! I'll definitely try it. - Deborah