New York State IPM Program

June 9, 2016
by Joellen Lampman
Comments Off on For Wasps, Prevention Is Key — and the Time Is Now

For Wasps, Prevention Is Key — and the Time Is Now

Most of the wasps we’re too familiar with (and afraid of) are sociable with their own kind, building large nests in trees or underground. The problem is when they build nests under your eaves, picnic tables, or even (if you’re a farmer) under the seat of that baler  you’re about to rev up as part of your pre-harvest maintenance check.

At a distance these wasps make great neighbors. As predators of flies, caterpillars and other soft-bodied insects, they help keep their numbers in balance. And that balance, that ounce of prevention, is a core tenet of IPM. But wasps are trigger-happy, so to speak — grab that picnic table to move it out of the sun and you’ll wish you looked underneath it first.

We could talk about any wasp you want, but today we’re focusing on bald-faced hornets. Just know that you can also apply IPM’s preventive tactics — we’ll get to that later — to your standard-issue yellow jackets, paper wasps, mud daubers and honey bees.

Big nests for big bruisers: this carton nest is too close to home.

Big nests for big bruisers: this carton nest is too close to home.

Bald-faced hornets house their colonies in large, enclosed carton nests. Like most wasps (and bees) these mostly mild-mannered critters turn nasty when their nest is threatened. They don’t know you had no intention of harm. But when  bald-faced hornets live too close, yes, they represent a public health concern.

Bald-faced hornet, up close and personal. Courtesy Gary Alpert, Harvard U.

Bald-faced hornet, up close and personal. Courtesy Gary Alpert, Harvard U.

Did You Know…?

  • What’s in a name?: White-faced hornets can be easily identified by the large patch of white on their faces.
  • Family relations: This hornet is the largest yellow jacket species in North America.
  • By the numbers: A nest can contain hundreds of hornets, and most will attack to protect their queen.
  • Danger! White-faced hornets have unbarbed stingers, so they sting repeatedly. (Author’s note: Take it from me — disturb a nest and yes, you might get stung way more than you’d like.)
  • Beneficial insect: White-faced hornets are important predators of flies, caterpillars and other soft-bodied insects.
Only one way out of a carton home, but space enough for a battalion of angry moths to exit. courtesy Wikimedia Commons.

Only one way out of a carton home, but space enough for a battalion of angry moths to exit. Courtesy Wikimedia Commons.

Since technically it’s still spring and a chilly May slowed them down, you still have time. Inspect (in IPM lingo, “scout”) the aforementioned eaves, picnic tables, and outdoor equipment as well as the undersides of the railing on your porch or deck; that sort of thing. You’re looking for small carton nests that look like these, only way smaller. For other stinging wasps, keep and eye out for what looks like clots of mud (nifty inside, should you get a chance to dissect one) and the clusters of open cells, rather like honeycombs, that comprise a paper-wasp nest. Basically, you want to find a nest under construction, as it were — one with just a few workers ferrying back and forth to care for their queen.

Did You Know…?

  • Last year’s empties: See a scary-big nest? Most likely it’s from last year — and wasps don’t reuse them. On the other hand, a subtle scent left behind tells other wasps that this could be a good place to build a nest of their own. So get rid of empties.

Moving quietly on a warm-enough day, stake out a claim nearby and watch the nest for 15 minutes or so. See any wasps? You’ve got an active one. No wasps? Best to scrape the old nest off so they won’t worry you later.

How to get rid of them? At dusk or dawn (dawn is better — it’s usually cooler) get out there with a tall pole, a SuperSoaker, or a hose with a good nozzle on it (you want a focused, powerful stream of water) and knock them down one at a time. Then stomp on them. Need a light? Don’t shine it right on the nest; better yet, cover your light with red cellophane. (Wasps don’t register red.)

Looking ahead — for larger nests later in summer, ask yourself if the nest is close enough to where you live, work or play to pose a significant threat. If it’s at a distance, best to leave it be.

More prevention (core IPM!): cover outdoor garbage receptacles and pick up dropped fruit under fruit-bearing trees. Integrated pest management can help to determine if a bald-face hornet nest is a danger and what to do if it should be removed.

For more information visit:

For more information from the New York State IPM Program on other stinging insects, click here.

June 5, 2015
by Matt Frye
Comments Off on Inspect for Wasps and Avoid the Sting

Inspect for Wasps and Avoid the Sting

Yellowjackets, bald-faced hornets and paper wasps are stinging insects that nest on or near structures. While colony sizes start small, the population of stinging insects in nests grows over time and can result in hundreds to thousands of individuals in the case of yellowjackets. Whereas management of large nests requires the assistance of a professional, starter nests can be easily knocked down, repeatedly if necessary, to discourage future nesting. Here are some steps to inspecting for wasps to avoid the sting!

1. Inspection: starting in early June, weekly walks around the perimeter of your property or facility can be used to identify the start of stinging insect nests. This might include paper wasps, which create an open-comb nest, or yellowjackets and bald-faced hornets that create nests wrapped in a papery envelope.

2. Removal: early nests may only contain a few individuals. These can be knocked down with a pole or by spraying with a hose from a safe distance. It is advised that you wear thick clothing, and conduct work at night using indirect light (do not shine a beam of light directly at the nest). Red filtered light will not be detected by wasps.

IMG_1748  IMG_1775

3. Extermination: Once nests are on the ground, stomp on them to kill any adults or larvae that are inside.

IMG_1756

4. Repeat: if queens escape, they may return to rebuild the nest somewhere nearby. However, repeated removal of the nest will ultimately discourage wasps from nesting there.

Note: some yellowjacket species will nest in wall voids, and you will see wasps flying in and out of the space during your inspection. A vacuum can be used to reduce the number of wasps that nest in wall voids, as shown in this video.

Staples White Plains (2)

Skip to toolbar