There is nothing quite like walking into the garden and finding a tomato that looked perfect yesterday suddenly marked by a strange hole. You may see a small opening near the stem, a larger cavity on the side, or an irregular bite that seems to have appeared overnight. Naturally, the first question is: What is eating my tomatoes?
The good news is that a few damaged tomatoes do not necessarily mean your entire garden is in trouble. Holes in tomato fruit are relatively common, and several different pests—or even wildlife—can be responsible. The key is to look closely at the type of damage, where the hole appears, and what other clues are present on the plant.
The original article identifies several common possibilities, including tomato fruitworms, hornworms, slugs and snails, and birds or other small animals. Extension resources also list corn earworms (tomato fruitworms), hornworms, slugs, picnic beetles, and cutworms among potential causes of holes in tomato fruit.
First, Don’t Panic About a Few Holes
Finding damaged fruit can be frustrating, especially after spending weeks watering, pruning, feeding, and protecting your plants. But a hole in one or two tomatoes does not automatically mean the plant is doomed.
Instead of immediately reaching for a pesticide, take a few minutes to investigate. Identifying the culprit first is important because different pests behave differently and require different approaches.
A useful starting point is to examine:
- The size and shape of the hole
- Whether the hole is near the stem or elsewhere on the fruit
- Whether the damage is shallow or extends deep into the tomato
- Whether there are droppings or frass nearby
- Whether leaves are also being eaten
- Whether you notice slime trails
- Whether the fruit is already overripe or damaged
- Whether birds or other animals have access to the garden
These clues can turn a mysterious hole into a much easier pest-identification puzzle.
Tomato Fruitworms Can Bore Directly Into the Fruit
One of the most important suspects is the tomato fruitworm, also known as the corn earworm. These are caterpillars that can feed directly on tomato fruit.
The damage may appear as a relatively distinct hole, often toward the upper portion of the tomato. Once the caterpillar enters the fruit, it can continue feeding inside, making the damage considerably worse than what is visible from the outside.
University of Minnesota Extension lists corn earworm, also called tomato fruitworm, as a pest capable of chewing holes into tomato fruit.
One reason these pests can be particularly frustrating is that you may not see the caterpillar immediately. The visible opening can be much easier to spot than the insect responsible for creating it.
If you find a suspicious hole, inspect the surrounding fruit and nearby plants carefully rather than assuming the problem has disappeared.
Hornworms Can Cause Bigger Damage
Tomato hornworms are another familiar garden pest. These large green caterpillars are capable of consuming impressive amounts of foliage, and they can also damage tomato fruit.
Hornworm damage can be especially noticeable because the insects themselves can become surprisingly large. They often blend into green foliage, however, which means a gardener can overlook them despite the amount of damage they are causing.
Look for:
- Large areas of missing leaves
- Chewed fruit
- Dark droppings, known as frass
- Large green caterpillars hiding among stems and leaves
University of Minnesota Extension notes that hornworms can chew holes in tomato fruit and may also severely defoliate plants. UC Integrated Pest Management likewise notes that high hornworm populations can extensively defoliate tomato plants and scar fruit.
If you discover a hornworm, hand-picking is often a straightforward option for a home garden when you are comfortable handling the caterpillars.
Slugs and Snails Prefer a Different Approach
Not every tomato hole comes from a caterpillar.
Slugs can also chew into tomato fruit, particularly when conditions are favorable for them. Because slugs are primarily active at night, you may never see the culprit during your usual daytime garden inspection.
University of Minnesota Extension identifies slugs as another cause of holes in tomato fruit and notes that they are typically active at night.
If you suspect slugs, inspect the garden after dark with a flashlight. Check around the base of tomato plants, underneath leaves, around mulch, and near other damp hiding places.
Silvery trails can also provide a valuable clue.
An extension specialist responding to a recent tomato damage question similarly recommends checking at different times of day because slugs are active at night.
Birds and Small Animals May Be Responsible
Sometimes the culprit isn’t an insect at all.
Birds may peck at ripening tomatoes, especially when fruit becomes soft and attractive. Squirrels and other small animals can also investigate ripe garden produce.
Animal damage often looks different from a caterpillar boring into the fruit. Instead of a small, concentrated entry point, you may find a shallow, jagged, or partially eaten area.
Extension guidance notes that birds can peck into tomatoes, particularly when they are looking for moisture, although the location and appearance of the damage can help distinguish this from other problems.
If the holes appear mainly on exposed, ripening tomatoes and you notice other signs of animal activity, wildlife may be a better suspect than insects.
Not Every Hole Is Caused by a Pest
This is an important point for gardeners.
Sometimes what looks like pest damage is actually the result of a physiological problem, fruit-development issue, or secondary decay.
For example, extension specialists distinguish true chewing holes from disorders such as blossom-end rot and other forms of fruit damage.
The difference can usually be spotted by examining the affected area carefully.
A true insect hole often looks as though something has physically chewed into the fruit. A physiological disorder may instead appear as a sunken, discolored, or deteriorating patch without the characteristic signs of chewing.
This is why taking a closer look before treating the plant can save you time, money, and unnecessary applications.
Check the Leaves as Well as the Fruit
One of the easiest ways to narrow down the culprit is to stop looking only at the tomatoes.
Inspect the entire plant.
If the fruit has holes but the leaves look mostly untouched, you may be dealing with a pest that focuses heavily on fruit.
If the leaves have large sections missing, however, a caterpillar such as a hornworm becomes more suspicious. Hornworms are well known for consuming tomato foliage and can cause severe defoliation when populations are high.
Also check the undersides of leaves and areas close to the stems. Some pests can be surprisingly difficult to spot because they remain still or blend into the plant.
Inspect Damaged Tomatoes Carefully
When you discover a tomato with a hole, don’t immediately throw away every fruit on the plant.
Instead, examine the damaged tomato.
Look for:
- A caterpillar or insect inside the opening
- Dark or wet material around the damaged area
- Frass or insect droppings
- Signs that the hole is expanding
- Mold or soft rot
- Additional holes elsewhere on the fruit
If a tomato has extensive damage, is leaking, smells unpleasant, or has begun to rot, it is generally better to remove it rather than leave it on the plant.
Removing badly damaged fruit also helps prevent it from becoming an attractive food source for additional pests.
Remove Seriously Damaged Fruit
Gardeners sometimes hesitate to remove damaged tomatoes because they don’t want to waste something they worked hard to grow.
But leaving severely damaged fruit hanging on the plant isn’t always helpful.
A tomato that has been opened by an insect or animal can become more vulnerable to secondary deterioration. Once the protective skin has been broken, microorganisms and other pests have an easier route into the fruit.
If only a small portion is damaged and the rest of the tomato remains firm and healthy, gardeners may sometimes salvage the unaffected portion after carefully removing the damaged area. However, any tomato showing significant decay, mold, or questionable spoilage should be discarded.
When in doubt, it is better to sacrifice one tomato than risk consuming spoiled produce.
Don’t Spray Before You Know the Problem
One of the biggest mistakes gardeners can make is treating first and identifying the problem later.
Different pests require different strategies, and broad pesticide use can affect beneficial insects as well as unwanted pests.
For example, UC IPM recommends conserving natural enemies of hornworms and avoiding disruptive pesticide treatments when they are unnecessary.
For home gardeners, the first line of defense can often be simple observation and physical removal.
If you eventually decide that a treatment is necessary, choose a product specifically labeled for the crop and pest, and follow the label’s instructions carefully—especially regarding harvest intervals.
Encourage Natural Garden Helpers
A healthy garden is home to more than the insects that damage plants.
Beneficial insects and other natural predators can help keep pest populations under control. Avoiding unnecessary broad-spectrum treatments can help preserve these natural allies.
This is particularly relevant with caterpillar pests. UC IPM notes that naturally occurring parasites can attack hornworm eggs and larvae, providing an important form of biological control.
Rather than trying to eliminate every insect from the garden, a better goal is often to maintain a reasonable balance.
Physical Barriers Can Protect Ripening Tomatoes
If birds or other small creatures are responsible for the damage, physical barriers can be particularly useful.
For example, breathable mesh bags can be placed over individual fruits to create a physical barrier against some insects, slugs, snails, and birds. The bags need to be large enough to allow the tomato to continue growing and should be secured carefully around the stem.
For larger wildlife problems, stronger barriers may be necessary.
The advantage of physical protection is that it reduces reliance on chemical treatments while directly preventing pests from reaching the fruit.
Keep the Garden Clean
Good garden hygiene can also make your plants less attractive to pests.
Remove heavily damaged fruit, clear away fallen produce, and keep an eye on overripe tomatoes. Fallen or rotting fruit can attract insects such as picnic beetles.
University of Minnesota Extension specifically notes that picnic beetles are associated with overripe, rotting, or damaged tomatoes.
Regular harvesting is therefore more than simply a way to collect your crop. It can also help reduce opportunities for certain pests to establish themselves around your plants.
A Simple Tomato Inspection Routine
You don’t need to spend hours every day inspecting your garden.
A quick routine can make a big difference.
Start by examining the newest and ripening fruit. Look for fresh holes, discoloration, or soft areas.
Next, inspect the leaves. Look for missing sections, caterpillar droppings, eggs, or unusual chewing patterns.
Then check around the base of the plant. Slugs and other nighttime pests may hide in damp areas, under mulch, or beneath leaves.
Finally, if you notice new damage, inspect the garden again after sunset. Some pests are much easier to identify when they are actively feeding.
The more frequently you inspect the plants, the easier it becomes to notice a problem before it becomes widespread.
Does One Hole Mean the Whole Harvest Is Lost?
Absolutely not.
A few damaged tomatoes are a common frustration for home gardeners, but they don’t necessarily indicate a major infestation.
The important thing is to determine whether the damage is isolated or increasing.
If you find one damaged tomato and no other signs of pests, continue monitoring the plant.
If you suddenly find numerous tomatoes with fresh holes, extensive leaf damage, caterpillars, slime trails, or other evidence of feeding, then it is time to investigate more thoroughly and take appropriate action.
Recent extension guidance also emphasizes that identifying the actual cause is important before deciding how to treat the problem.
Conclusion :
Finding holes in your tomatoes can certainly be discouraging, especially when you’re looking forward to harvesting a beautiful crop. But the sight of a damaged tomato doesn’t automatically mean your garden is failing.
Tomato holes can have several causes. Caterpillars such as tomato fruitworms and hornworms may chew into the fruit, while slugs and snails can create irregular feeding damage. Birds and other animals may also take bites from ripe tomatoes. In some cases, what appears to be an insect hole may actually be related to fruit development, rot, or another non-pest problem.
The best response is to slow down and investigate before treating. Examine the shape and location of the damage, inspect the leaves, look for droppings or slime trails, and check the garden at night if necessary. Once you know what you’re dealing with, you can choose the simplest appropriate solution.
And remember: gardening is rarely about achieving a completely perfect harvest. A few holes are part of the challenge of growing food outdoors. With regular inspection, good garden hygiene, physical barriers when needed, and thoughtful pest management, you can often protect most of your crop without turning your garden into a chemical battlefield.
So the next time you discover a mysterious hole in a tomato, don’t panic. Treat it as a clue. Your garden is giving you information about what is happening, and with a little careful observation, you can usually figure out who’s been enjoying your tomatoes before you got there.
