Thuricide Concentrate Contains Bacillus Thuringensis. This is the one you want for tomatoe hornworms. This is the most effective, safe and inexpensive treatment for tomatoe hornworms. Start spraying them as soon as you see them. Easiest to get rid of when they are small. Repeat applications to maintain control. Have you ever seen a tomatoe hormworm? They are ugly suckers. Thurcide is natural and not harmful to beneficial insects. Non-toxic to humans, pets and beneficial insects. May be sprayed up to and on the day of harvest. Also controls tent caterpillers, gypsy moths, cabbage loopers and more. May be used on vegetables, ornamentals, fruit and shade trees. 1 Tablespoon per gallon of water for vegetables and fruit. 4 Tablespoons per gallon of water for shade trees. Spray top and bottom of leaves. Use all of spray mixture within 24 hours. 8 Oz.