This bug is defiantly a foe. And not only a foe but a HUGE foe. When you first discover these creature in your garden it is time to take action or the will take over your plants and kill them quickly.
They have 3 stages, egg, nymph (5 stages) and adult. Adults can lay up to 200 eggs in a 2 month period.
Today I found an adult on my cucumber and nymphs on my cucumber and tomatoes. I headed out to the areas with my mixture of neem oil and Dr. Bronners sal-suds soap (video information below) and scissors. I sprayed the adult with the spray and then cut it with my scissors. The nymphs I sprayed and then squashed them with my scissors. You could also wear gloves and squish them with your hands.
Note: I use a spray bottle for my spray.