![]() Sprinkle some diatomaceous earth around your tomato plants and hornworms won’t stand a chance. The pieces are so small that they won’t harm animals or people, but when insects walk over them, they’re killed immediately. If you look at it under a microscope, it looks like broken glass. ![]() Diatomaceous Earthĭiatomaceous earth is a non-toxic substance made out of fossilized tiny aquatic organisms. The additional benefit is that some of these plants, such as basil, give your tomatoes a stronger flavor. These plants also attract predatory insects that will send hornworms running. They’ll rather eat them than your tomatoes interplanting basically acts as a decoy. You’re going to choose the better option right? Well, hornworms see marigolds, basil, or dill as the five-star option. For hornworms, it’s like having the option to eat from a fast food joint or a five-star restaurant. Marigolds, basil, or dill will help keep many pests including hornworms away from your tomatoes. These hornworms have been attacked by wasps and will eventually die. You might see them with what looks like grains of rice attached to their bodies, they are called parasitic wasp larvae. ![]() Wasps act as a form of biological control and feed on hornworms. If your tomato plants are not already infested with hornworms, start by preventing them from finding their way near your plants, to begin with. The good news is, you can get rid of hornworms before they do any damage, keep reading to find out how! Prevention is Better Than Cure They camouflage very well with green foliage, and so you won’t notice them until they’ve chewed through everything, and your leaves are severely defoiled with large holes in them, or there’s scarring on the surface of your tomatoes. When it comes to planting tomatoes, a gardener’s number one concern is tomato hornworms! They will destroy your plants quicker than any other irritant in your backyard.
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