How to Get Rid of Hornworms on Tomato Plants

Tomatoes are one of the most popular vegetables to grow in a home garden. Unfortunately, they are also a favorite meal of the hornworm, a large caterpillar that can cause devastating damage to tomato plants. The good news is that there are several effective ways to get rid of hornworms without harming your plants or the environment. In this article, we will share some of the best methods for eliminating these pesky pests.

Identify the Hornworm

The first step in getting rid of hornworms is to know what you are dealing with. Hornworms are large green or brown caterpillars with a distinctive horn-like protrusion on their rear end. They can grow up to 4 inches long and are often found hiding in the foliage of tomato plants. Once you have identified a hornworm infestation, it is time to take action before they cause too much damage to your plants.

Handpicking

One of the most effective ways to get rid of hornworms is to simply pick them off of your plants by hand. This can be time-consuming, but it is an organic and effective method. Look for hornworms on the undersides of leaves and in the leaf axils. Once you have found one, use gloves or a paper towel to remove it from the plant and drop it into a bucket of soapy water. Be sure to check your plants daily for new hornworms, as they can quickly multiply and cause extensive damage.

Bacillus thuringiensis (Bt)

Bacillus thuringiensis (Bt) is a natural soil bacteria that can be used as a biological control for hornworms. When ingested by the hornworm, Bt releases a toxin that kills the pest within a few days. Bt is safe for humans, pets, and wildlife, making it an environmentally friendly option. You can purchase Bt at most garden centers and online retailers. Follow the package instructions for application, but typically you will mix it with water and spray it onto the foliage of your tomato plants.

Neem Oil

Neem oil is another organic option for controlling hornworms. This oil is derived from the neem tree and has insecticidal properties that make it effective against pests like hornworms. Mix neem oil with water and a small amount of dish soap to create a spray that can be applied to your tomato plants. Be sure to cover both the tops and bottoms of leaves, as well as the stem and any developing fruit. Repeat the application every 7-14 days, as neem oil breaks down quickly in sunlight.

Diatomaceous Earth

Diatomaceous earth is a natural powder made from the fossilized remains of tiny aquatic creatures. When sprinkled on your tomato plants, diatomaceous earth creates a barrier that the hornworms will not cross. The powder is non-toxic to humans and pets, but it is important to wear a dust mask and eye protection when applying it. Diatomaceous earth can be found at most garden centers and online retailers. Be sure to reapply after rain or watering.

Conclusion

Hornworms can be a frustrating pest to deal with, but they can be eliminated with the right methods. Handpicking, Bacillus thuringiensis, neem oil, and diatomaceous earth are all effective options for controlling hornworms without harming your plants or the environment. By identifying hornworms early and taking action, you can enjoy a healthy and bountiful tomato harvest.