foamy stuff on salvia
My Salvias - May Night and Caradonna - are just starting to come into full bloom here in North Dakota and I've noticed a foamy/sudsy stuff on the flower stems. Can anyone tell me what this is? I'm assuming it's from an insect or disease, but can't find it by searching google.
I am out of town right now, but if this description doesn't lead us to an answer I can take a photo when I return.
Thanks in advance for any help.