Hand picking is a good start, I know they like to drop when a shadow
passes over. Try passing a flame from a small propane torch over them
about enough to singe the hairs on your forearm will singe the
antennae off of them and stop them eating and breeding. You might
scorch a leaf until you get the hang of it but it does work.
The IPM folks use turks turban squash to monitor for them as they
prefer it, and once they find them they begin control methods.

If you want to experiment grind up a bunch of them in a blender and
make a spray containing their juices and pathogens.