I have a row of 6 melon plants (I can't remember what kind! - but cantalope or french melons) all showing this leaf curling pattern to a greater or lesser degree.

They are otherwise healthy, seem to be growing, definitely flowering, and just starting to set fruit.

Any ideas what it is and how to treat the plants? (I read something about aphids and melon leaves curling, but I've checked a couple times, at different times of day, and not found any insects on them)

{{gwi:71137}}