Gardening and Horticulture - Rose Pests

Hi,was checking all my roses(hybrid teas),when i noticed what looked like areas of gob(white spit lol).I have never had any bug problems before except for the bloody aphids.Anyone have a clue what leaves or nests anything like that?Mini caterpillars?
Not very large ,maybe size of a dime(canadian dime,so that would be worth one third of the america one lol)and only on three of 40 plants.... Thanks

The folks at classic roses would say: Cuckoo-spit is the unsightly foamy white substance sometimes found nestling in leaf joints or around flower buds. It is actually enclosing a young froghopper beetle, which when fully grown will hop around roses dining on the sap found in young shoots and buds. It is unlikely to cause any great amount of devastation other than the occasional wilting bud and seldom is they to be found in great number. The best method of control is to give the cuckoo spit a blast from the hosepipe before the young froghopper becomes mature.

great thanks !!!