Visit our sister site, BirdSong Nature Shop, for great prices on thousands of backyard birding items:
At the first sign of hornworms, spray with Garden Insect Spray with Spinosad or Bug Buster Pyrethrin Insect Spray and repeat the spray every two to three weeks, until their feeding period has ended.
Outside the U.S. & Canada:
U.S. 1051 Clinton Street, Buffalo, NY 14206
Canada 100 The East Mall, Unit #12, Toronto, ON M8Z 5X2