I have been killing these things with little effort using Bacillus Thuringiensis, BT for short. I mix some in a gallon sprayer once a week and spray my maters and peppers. It is extremely efficient with the hornworms and other caterpillars. Here's a pic of the stuff I bought at Lowes. It is claimed to be organic!!
![zcEo3Q0.jpg](/proxy.php?image=http%3A%2F%2Fi.imgur.com%2FzcEo3Q0.jpg&hash=352bfbf2c054b50e61aaa223b355d0e4)