The most common tomato plant pests are deer, rabbits, groundhogs, and insects

Deer will eat tomato leaves, stems, and fruit, especially in early summer when plants are tender. Rabbits nibble leaves and can strip a plant bare in a single night. Groundhogs (also called woodchucks) eat the fruit directly off the vine and will burrow under fencing to reach plants. Insects like hornworms, aphids, and spider mites also damage tomato plants, though they work differently than larger animals—they pierce leaves or bore into fruit rather than eating whole sections.

The animal causing damage depends on your location and what you see left behind. Deer leave ragged leaf edges and browse at a height of four to six feet. Rabbits cut stems cleanly at a low angle, usually within two feet of the ground. Groundhogs leave larger, messier damage and often eat the fruit whole. Insect damage shows as holes, yellowing, wilting, or visible pests on the undersides of leaves.

Key Takeaways

  • Deer, rabbits, and groundhogs are the main large animals that eat tomato plants, and each leaves different damage patterns you can use to identify which one is visiting.
  • Fencing works best for rabbits and groundhogs if it is at least three feet tall for rabbits and extends underground at least twelve inches for groundhogs.
  • Deer require taller fencing (six to eight feet) or a two-fence system, which is why many gardeners use repellents or motion-activated sprinklers instead.
  • Hornworms, aphids, and spider mites are common insect pests that damage tomato plants and can be managed by hand-picking, spraying with water, or using neem oil.
  • Removing hiding spots like tall grass and brush near your garden reduces the chance that animals will visit in the first place.

How to identify which animal is eating your tomato plants

Look at the damage pattern and height to narrow down the culprit. Deer leave ragged, torn leaf edges because they have no upper front teeth and tear vegetation rather than cut it cleanly. They browse at shoulder height, so damage appears four to six feet up the plant. Rabbits make clean, angled cuts with their sharp front teeth, usually within one to two feet of the ground. Groundhogs eat larger sections and often target the fruit itself, leaving bite marks on tomatoes still on the vine.

Insect damage looks different. Hornworms (the caterpillar of the sphinx moth) leave large, irregular holes in leaves and can strip a plant quickly—you may also see dark droppings on leaves below the damage. Aphids cluster on new growth and leaf undersides, causing yellowing and curling. Spider mites create fine webbing on leaves and cause a speckled, yellowing appearance. If you see the pest itself on the plant, take a photo and search for it by description to confirm what you are dealing with.

Fencing and barriers for rabbits and groundhogs

A fence at least three feet tall stops most rabbits, but it must be sturdy—rabbits can push through loose wire. Use chicken wire or hardware cloth (a metal mesh with small holes) and bury it at least six inches underground or bend it outward at ground level to prevent rabbits from digging under. Check the fence regularly for gaps or damage, especially after heavy rain or wind.

Groundhogs require taller and deeper barriers. A fence should be at least three feet tall above ground and extend at least twelve inches underground, angled outward at the bottom. Groundhogs are strong diggers, so hardware cloth is more effective than chicken wire. If you have an existing garden bed, you can also install a barrier just around the tomato plants rather than fencing the entire garden. Remove brush, tall grass, and wood piles near the garden—groundhogs use these as cover and are less likely to visit if they have nowhere to hide.

Managing deer with fencing or repellents

Deer are harder to exclude than rabbits or groundhogs because they jump. A single fence needs to be six to eight feet tall to stop most deer, which is expensive and visually intrusive. A more practical option for many gardeners is a two-fence system: two fences four to five feet tall, spaced four to five feet apart. Deer cannot judge the distance and are reluctant to jump into the space between them.

If fencing is not practical, repellents can reduce browsing. Motion-activated sprinklers startle deer when they approach and work best when moved every few days so deer do not become accustomed to them. Repellent sprays containing capsaicin (hot pepper) or predator urine make plants taste or smell unpleasant, but they wash off with rain and need reapplication every one to two weeks. Hanging bars of soap, old CDs, or strips of cloth around the garden may deter deer temporarily, but deer adapt quickly to these methods. Combining two or three approaches—such as a shorter fence plus a repellent spray—is more effective than relying on one alone.

Controlling hornworms and other insect pests

Hornworms are large, green caterpillars with white stripes and a horn-like projection at the rear. They can defoliate a tomato plant in days. Check plants daily, especially the undersides of leaves, and hand-pick any hornworms you find—drop them into soapy water or crush them. If you spot white cocoons on a hornworm's back, leave it alone; those are parasitic wasp cocoons, and the wasps will kill the hornworm naturally.

Aphids and spider mites are smaller and harder to spot. Spray the plant with a strong stream of water from a hose to knock them off; repeat every few days. If the infestation is heavy, neem oil (a plant-based pesticide) can reduce populations. Spray in the early morning or late evening when beneficial insects are less active, and follow the label directions. Encouraging natural predators like ladybugs and lacewings by planting flowers nearby also helps control insect pests over time.

Removing hiding spots and garden maintenance

Animals are more likely to visit a garden surrounded by cover. Trim back tall grass, brush, and weeds within ten to fifteen feet of your tomato plants. Remove fallen fruit and dead plant material promptly—these attract pests and give them food sources. Keep compost bins away from the garden and make sure they are enclosed so they do not attract groundhogs or other animals.

Mulch around tomato plants to suppress weeds, but keep it a few inches away from the stem to avoid rot and to make it harder for pests to hide right at the base. Water in the morning rather than the evening so the soil dries during the day; this reduces fungal problems and makes the garden less attractive to some pests. These practices do not eliminate animal damage on their own, but they reduce the garden's appeal and make fencing or repellents more effective.

When to call for professional help

If you have a large groundhog population or persistent deer pressure, a local wildlife control service can assess your situation and recommend trapping or exclusion methods specific to your property. Many services can also install or repair fencing. Contact your county extension office or local animal control for referrals to licensed professionals in your area.

If insect damage is severe despite your efforts, a local nursery or extension office can identify the pest precisely and recommend the most effective treatment for your region. Some pests respond better to certain products or timing, and a professional can save you time and money by pointing you toward what actually works in your climate.

Frequently Asked Questions

Can I use netting to protect tomato plants from deer?

Netting works for birds and insects but not for deer—they can push through or jump over loose netting. Netting is also difficult to manage around a growing plant and can trap the plant as it gets larger. Fencing or repellents are more practical for deer.

Will planting tomatoes in containers stop animals from eating them?

Containers on a deck or patio keep plants away from groundhogs and rabbits, but deer can still reach containers on the ground or on low tables. Containers are useful if you have rabbit or groundhog pressure but not enough to stop deer on their own.

What time of year do animals eat tomato plants most?

Deer browse most heavily in early summer when plants are tender and other food is scarce. Rabbits and groundhogs eat throughout the growing season. Insects like hornworms peak in mid to late summer. Damage pressure varies by region and year depending on animal populations and weather.

Is it safe to use chemical pesticides on tomatoes I plan to eat?

Many pesticides are safe for food crops if you follow label directions and observe the waiting period before harvest. Neem oil and insecticidal soaps are lower-toxicity options. Always read the label to confirm the product is approved for tomatoes and follow all instructions, including how long to wait after spraying before harvesting.

Can I trap and relocate groundhogs or rabbits myself?

Laws about trapping and relocating wildlife vary by state and county. Some places require a permit, and relocating animals without permission is illegal in many areas. Contact your local wildlife agency or animal control to learn what is legal in your location before setting traps.