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Well, in my days of working for someone else, I'd recommend the "Re-Start Program". This involves some leather gloves and plucking them from the plants and tossing them in your neighbors' yards. That's one method.
Now, I'd recommend BT. It's not a brand, but an agent sold commonly just by the name BT. You can find it around rather easily, and it is a caterpillar-specific killer that uses biological control mechanisms. HOWEVER, PLEASE ONLY SPOT-TREAT. DON'T BROADCAST OR YOU'LL GET RID OF ALL YOUR BUTTERFLIES AND MOTHS.
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