Bagworms: The Silent Killer of Your Trees (And How to Stop Them)

If you’ve noticed small, pinecone-like bags hanging from your trees or shrubs, you could be dealing with bagworms—one of the most destructive pests we see here in Northwest Ohio.

At ProGuard Pest & Lawn, we get calls every year from homeowners in Van Wert, Celina, and Paulding who didn’t realize they had a problem until it was too late.

Let’s break down what bagworms are, why they’re so damaging, and what you can do to protect your property.

What Are Bagworms?

Bagworms are caterpillars that build protective “bags” made of silk and pieces of the plant they’re feeding on. These bags camouflage them perfectly, making them hard to spot.

They most commonly attack:

• Arborvitae

• Spruce trees

• Junipers

• Cedar trees

Once attached, they feed on the foliage—often going unnoticed until significant damage is already done.

Why Bagworms Are So Dangerous

Bagworms aren’t just another nuisance—they can kill entire trees, especially evergreens.

Here’s why:

• They feed aggressively and continuously

• A heavy infestation can strip a tree bare

• Evergreens don’t regrow lost foliage like deciduous trees

• Damage is often permanent

By the time many homeowners notice browning, it’s already advanced.

Signs You Have Bagworms

Keep an eye out for:

• Small hanging bags (look like pinecones or ornaments)

• Browning or thinning branches

• Dead patches on evergreens

• Increasing number of bags over time

If you’re seeing even a few—there are likely many more.

When Is the Best Time to Treat?

Timing is everything with bagworms.

• Late May – Early July: BEST time to treat (when larvae are active and vulnerable)

• Late Summer – Fall: Bags are tougher and harder to control

• Winter: You can manually remove visible bags

Professional treatments during the early stage are the most effective way to stop an outbreak before it spreads.

DIY vs. Professional Treatment

You can remove bagworms by hand—but there are a few challenges:

• You must remove every single bag

• Missing even a few can restart the infestation

• Taller trees make this difficult and unsafe

Professional applications:

• Target bagworms at the right stage

• Use products that are safe for your family and pets

• Provide full coverage of your trees and shrubs

Protect Your Landscape with ProGuard Pest & Lawn

At ProGuard Pest & Lawn, we specialize in protecting homes and landscapes across Northwest Ohio. Our treatments are designed to:

• Stop bagworms early

• Prevent future infestations

• Keep your trees healthy and thriving

If you’re in Van Wert, Celina, or Paulding, now is the time to act before bagworms cause costly damage.

Final Thoughts

Bagworms may be small, but the damage they cause is anything but.

The earlier you catch them, the easier—and more affordable—it is to protect your trees.

If you’re unsure whether you have bagworms or want a professional opinion, ProGuard Pest & Lawn is here to help.