Battling the Squashvine Borer: Protect Your Garden

The Pesky Squashvine Borer

If you’ve ever walked into a garden to admire yoru thriving squash or zuchini plans only to find them suddenly wilted and collapsing, you’ve likely encountered one of every gardener’s worst nighmares—the squash vine borer.

These destructive insects can turn months and months of hrd work ino disappointment in just a matter of days. The frustrating part? Many gardeners don’t even realize there’s a problem until it’s too late.

What is a Squashvine Borer?

Despite its name, the squash vine borer isn’t a worm—it’s actualy th larva of a clear-winged moth that resemble a wasp. Adult moths lay tiny reddish-brown eggs near the base of the squash plants. Once the eggs hatch, the larvae burrow directly into the stem wher they feed on te inside of the plant.

Because the damage happens inside the vine, the problem often goes unnoticed until the plant begins to wilt.

Signs You Have Vine Borers

Keep an eye out for these warning signs:

• A healthy plant suddenly wilts during the day and doesn’t recover by evening (you’ll get to know which plants tend to be dramatic).

• Small holes near the base of the stem.

• crusty, sawdust-like material (called frass) coming from the stem.

• yellowing leaves despite adequate watering

• mushy stems

How to Prevent

Prevention is key and much easier than treatment.

Cover your young plants
Floating row covers keep the adult moths from laying eggs. Just remember to remove the covers when flowers appear so the pollinators can do their job.

Inspect daily
During peak season, check the base of your squash plants every day for eggs. I know this can be tedious but it is necessary and only takes a few minutes. Removing the eggs before they hatch is one the of the simplest ways to protect your harvest. Use some moving tape to dab and grab the teeny eggs from the stems.

Wrap the stem
Wrap the lower stem with aluminum foil or a breathable fabric to make it harder for larvae to bore into the vine. This is advice I still have yet to try out, but I have heard this has been a game changer for others.

Keep your garden clean
As the growing season progresses, clean-up is necessary to avoid disease and more pests. Disposing of the old vines and leaves will prevent the larvae from overwintering into the soil and coming back the following year. YEAH they can do that! Crazy right?!?!

Rotate your crops
Avoid planting your crops in the same spot year after year. I myself am guilty of this habit. I try to rotate but sometimes certain plants just work in the same place. However, a good crop rotation can help interrupt the pest's life cycle.

Treating Infected Plants

Treating infected plants has been very hard for me in the past but it is not impossible. A lot of times I expect the plant to not make it so I usually have a rotation of young squash seedlings ready to replace the infected one. There have been several items that have helped me to assess and either save the plant or pull it out and start fresh.

For an early caught infestation:

1. locate the hole (you'll likely see the frass first)

2. Carefully cut a slit into the stem lengthwise with a clean knife or shears.

3. Remove the larva

4. Spray the area with BT (Bacillus thuringiensis)
   -This can be sprayed or injected with a syringe directly into the hole the larva burrowed in from

Cover the damaged section with moist soil.

Fun Fact: Squash plants can grow new roots along the bury stems, giving them a chance to recover.

Quick recommendation: Some varieties can be resistant to these pesky bugs like the Tromboncino plant. This plant is one that I have personally grown and it has proven to be pest resistant, huge, prolific and awesome to look at!

Gardening is a constant learning experience. Sometimes the biggest lessons come from the tiniest pests, but with knowledge and persistence, you'll be one step ahead.