Skip to Content

11 Signs of Hornworms in Tomato Plants And Ways to Get Rid of Them

Sharing is caring!

Ah, the joy of growing your own tomatoes! The anticipation of biting into a plump, juicy fruit straight from the vine is truly satisfying. But what happens when your tomato plants start showing signs of distress? One possible culprit could be the hornworm, a notorious pest that loves to feast on tomato foliage.

These voracious creatures can quickly strip your plants of their precious leaves, leaving you with a sorry-looking garden. To save your tomatoes from these green gluttons, it’s essential to catch them early. In this article, we’ll arm you with knowledge about the 11 telltale signs of hornworms in tomato plants, helping you nip their invasion in the bud.

1. Stripped Foliage:

If you notice large sections of your tomato plant’s leaves missing, as if a tiny leaf monster has gone on a rampage, chances are you have hornworms in your midst. These sneaky critters have an insatiable appetite and can devour entire sections of foliage overnight.

Keep an eye out for leafless stems and branches that look like they’ve been pruned by a miniature landscaper.

2. Skeletonized Leaves:

Hornworms are not content with merely stripping leaves; they also enjoy turning them into lacy works of art. If you spot leaves with only veins remaining, creating an ethereal, skeletal appearance, it’s time to investigate further. These leaf structures are a clear indication of hornworm feeding habits.

3. Dark Green or Black Droppings:

Hornworms may be ravenous eaters, but they certainly don’t have table manners. As they feast on your tomato plant, they leave behind dark green or black droppings, also known as frass.

Keep an eye out for these tiny, pellet-like droppings on the ground or directly on the foliage. It’s like finding their calling card!

4. Chewed Blossoms:

Imagine this: Your tomato plants were once adorned with beautiful blossoms, promising a bountiful harvest. Suddenly, you find these blossoms looking like they’ve been nibbled on by tiny ravenous monsters. Well, that’s exactly what hornworms do.

They can munch on your precious blossoms, sabotaging the future fruit production of your tomato plants.

5. Large Green Caterpillars:

The hornworms responsible for the tomato plant invasion aren’t shy about their presence. These caterpillars can grow up to four inches long and sport distinct green coloring. Their size alone makes them hard to miss. So, keep a lookout for these plump invaders camouflaged among your tomato leaves.

6. Presence of White Cocoons:

One interesting twist in the hornworm saga comes when you spot small, white, rice-shaped cocoons on the caterpillars’ bodies. Fear not, for these cocoons are not a sign of new trouble brewing.

They are actually the eggs of a parasitic wasp that uses hornworms as hosts. The presence of these cocoons means nature is working in your favor, as the wasps help control the hornworm population.

7. Withered Branches:

If you notice entire branches of your tomato plant wilting and withering, seemingly overnight, it could be a result of hornworm activity.

These gluttonous pests can chew through the stems, obstructing the flow of nutrients to the affected branches. As a result, those branches lose their vitality and succumb to dehydration.

8. Chomped Green Tomatoes:

Hornworms are not content with devouring the leaves and blossoms alone. Given the chance, they’ll indulge in a sneaky bite of your developing green tomatoes as well.

Keep an eye out for partially eaten or damaged green fruits. Don’t let these pests ruin your dreams of a summer brimming with ripe tomatoes!

9. Hornworm Droppings with White Strings:

When hornworms are infected by parasitic wasps, their droppings take on a peculiar appearance. If you notice hornworm droppings with thin, white strings extending from them, it’s a sign that these pests have become hosts for wasp larvae.

While this may sound like a horror movie plot, it’s actually a natural way of combating hornworms in your garden.

10. Chewed Stems near the Ground:

Sometimes, hornworms take their dining experience to the next level and venture beyond the foliage. If you spot stems that have been gnawed or partially eaten near the ground, it’s a sign that these pests are not just satisfied with a leafy buffet. Their relentless appetite can lead them to seek tastier morsels, such as your tomato plant’s sturdy stems.

11. Evidence of Hornworm Eggs:

Before hornworms become the leaf-munching monsters we know, they start their lives as eggs. Keep a close eye on the undersides of tomato leaves, where hornworms often lay their tiny, round eggs in clusters. The eggs are usually white or light green, and their presence indicates the potential arrival of new hornworm recruits.

Ways to Get Rid of Hornworms in Tomato Plants:

So, you’ve identified the signs of hornworm infestation in your tomato plants. Now it’s time to fight back! Here are some effective strategies to rid your garden of these leaf-munching pests:


The most hands-on approach is to pluck the hornworms off your plants manually. Wear gloves to protect your hands, and inspect your tomato plants carefully, focusing on the underside of leaves and the stems.

Dispose of the hornworms by either squishing them (if you’re feeling particularly vengeful) or dropping them into a bucket of soapy water.

Attract Beneficial Insects:

Encourage natural predators of hornworms, such as birds, ladybugs, and parasitic wasps, to make your garden their home. Plant flowers like marigolds, dill, and fennel to attract these beneficial insects.

By creating a welcoming environment for them, you can establish a balanced ecosystem that keeps hornworm populations in check.

Use Organic Pesticides:

If manual removal and natural predators are not enough to control the hornworm invasion, consider using organic insecticides as a last resort. Products containing Bacillus thuringiensis (Bt), a naturally occurring soil bacterium, can effectively target hornworms while being safe for other beneficial insects and the environment.

Companion Planting:

Interplanting your tomatoes with companion plants that naturally repel hornworms can help deter these pests. Herbs like basil, mint, and rosemary, as well as flowers like petunias and marigolds, emit scents that hornworms find unpleasant. Planting them alongside your tomatoes acts as a natural repellent.

Provide Physical Barriers:

Create physical barriers to protect your tomato plants from hornworms. Use lightweight row covers or insect netting to prevent the adult moths from laying eggs on your plants. Ensure the covers are securely fastened to prevent hornworms from sneaking in.

Crop Rotation:

Practice crop rotation to disrupt the life cycle of hornworms. Avoid planting tomatoes in the same spot year after year. By rotating crops, you make it harder for hornworms to find their favorite food source and reduce the risk of reinfestation.

Prune Infested Areas:

If you spot heavily infested branches or stems, pruning them off can help contain the infestation and prevent further damage. Dispose of the pruned material carefully to avoid spreading hornworms to other parts of your garden.

Regular Inspection:

Stay vigilant and inspect your tomato plants regularly for signs of hornworm activity. Catching the infestation early on makes it easier to control and minimize the damage. Remember, prevention is better than a tomato salad ruined by hornworms!

Identifying the signs of hornworms in your tomato plants is crucial for protecting your harvest. By being alert and proactive, you can take swift action to eliminate these pests.

Whether it’s handpicking, attracting beneficial insects, or employing organic pesticides, there are various methods to combat hornworm infestation. Remember to maintain a healthy garden ecosystem and practice preventive measures to keep these leaf-munching invaders at bay.

With your newfound knowledge and determination, you’ll be able to savor the taste of homegrown tomatoes without sharing them with those pesky hornworms!

Sharing is caring!