Tomato Plants & Cutworms

Red tomatoes on the vine

Tomato plants are highly susceptible to damage from cutworms. Although cutworms are the most likely pests to attack tomatoes, they can harm other garden plants as well. Cutworm infestations should be controlled quickly to prevent spread.

Identification

A worm eating a leaf.

Cutworms come in several colors and patterns; they are most easily identified by the damage they do to plants. Cutworm larvae feed on stems at or below the soil surface, often cutting stalks down. In late season, they may feed on mature fruit as well.

Prevention

Plants can be protected by using "cutworm collars." These are rings of aluminum foil or cardboard that prevent worms from accessing stalks. They should be placed with one end extending under the soil surface, and the other several inches above ground. Rotate crops and till soil to kill overwintering larvae.

Monitoring

Monitor plants regularly and carefully for cutworms; worms tend to hide under leaves during the day. Watch for wilted or fallen plants, and remove edible plant residue in infested areas.

Natural Predators

Birds are natural predators; allow birds into your garden and they will hunt down cutworms. There are also natural parasites that kill cutworms; reducing insecticide use can let beneficial organisms flourish and help reduce cutworm threat.

Considerations

Insecticide is rarely effective or necessary in controlling cutworms. Instead, use a strategy of monitoring and protection; check regularly and remove all infestations before they spread.

References

• Ontario Ministry of Agriculture: Managing Cutworms in Vegetable Crops
• Glorious Gardens: Battling cutworms in the veggie garden