๐น Introduction
If you’ve ever planted a vegetable garden and found your young plants cut at the base overnight, you’ve likely met the cutworm โ a stealthy, soil-dwelling caterpillar that can destroy seedlings in a single night.
๐น What Are Cutworms?
Cutworms are not worms but larvae of nocturnal moths in the Noctuidae family. The most common species include:
- Agrotis ipsilon (Black cutworm)
- Peridroma saucia (Variegated cutworm)
- Feltia subterranea (Subterranean cutworm)
These larvae live in the soil and feed at night, chewing through the stems of seedlings and small transplants.
๐น Life Cycle
- Eggs โ Laid on plant debris or soil
- Larvae (Cutworms) โ Hide in the soil by day, feed at night
- Pupae โ Develop underground
- Adult moths โ Fly at night and lay eggs in the garden
The larval stage is the most destructive.
๐น Damage They Cause
- ๐ฑ Severed seedlings
- ๐ฅฌ Missing transplants
- ๐ชป Circular feeding holes at plant bases
- ๐ Sudden disappearance of entire rows
Cutworm attacks often look like someone โcutโ the plant at soil level โ hence the name.
๐น How to Prevent Cutworms
- ๐พ Remove plant debris and weeds before planting
- ๐ชต Use collars (paper, cardboard, or plastic) around the base of seedlings
- ๐ฆ Encourage predators: birds, frogs, ground beetles
- ๐ชฑ Turn soil before planting to expose larvae
- ๐ Water in the morning, not in the evening (they feed at night)
You can also sprinkle crushed eggshells or diatomaceous earth around plants.
๐น Organic Control Methods
- ๐ Handpick larvae at dusk with a flashlight
- ๐ Apply beneficial nematodes (Steinernema spp.) to the soil
- ๐ Use Bt (Bacillus thuringiensis) as a natural insecticide targeting caterpillars
Avoid using harsh pesticides as they may harm helpful insects too.
๐น Final Thoughts
Cutworms may be hidden, but their impact is visible and severe. With a mix of prevention, observation, and biological allies, you can protect your seedlings and keep your garden thriving.