Some sort of insect on a vine

I'm seeing positive results from the sulphur. Old leaves are completely free of the spots after one application; they appear on new leaves still. Fruits are forming nicely (though my vine doesn't produce edible fruits, just ornamental ones.)

One downside is that little white marks appeared on the leaves after spraying. I don't know if these are the dead insects or if they're residue from the sulphur -- I suspect the latter. Anyway after a week they vanished.

I've just given it a second spray and removed the worst infected new leaves manually. Fingers crossed.