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How to combat spotted lanternfly nymphs

Spotted Lanternfly: How to Get Rid of the Nymphs

The Spotted Lanternfly is a destructive insect that has invaded the Philadelphia area.  All winter long, their eggs lay waiting for the warm weather, carefully encased in a protective, hardened layer of secretion. Once they emerge as nymphs, it is time to take action! Read on to find out how to identify and combat Spotted Lanternfly in the Nymph stages.

How to identify spotted lanternfly nymphsHow to Identify Spotted Lanternfly Nymphs

Spotted Lanternfly goes through several identities during its life cycle. Adult females lay eggs in the fall, and they cover the egg masses in a secretion. This secretion dries hard and camouflages to look like dirt or clay. The young nymphs that emerge from the eggs in spring are black with white spots. In early summer, they gain red markings on their bodies. Later in midsummer, they become adults and shed their skin to form wings on their backs.

How to Get Rid of Spotted Lanternfly Nymphs

The experts at Giroud Tree and Lawn have been working closely with Penn State University’s Department of Entomology and Cooperative Extension to determine the best treatments and techniques for combating Spotted Lanternfly in each of the life cycle stages. According to Penn State:

Currently, the most effective trap for SLF is a sticky band wrapped around the trunks of trees. SLF nymphs and adults are trapped in the sticky barrier as they crawl up from the ground onto the trunks and move upward to feed on the tree./”

Sticky bands can be found at most hardware stores and also on Amazon.com. They are easy to install, but they should be changed weekly for the best results. However, it is important to be aware that these sticky bands can accidentally trap other insects and also small animals and birds. To avoid this problem, Penn State recommends cutting the sticky bands lengthwise so the surface area is not as broad. Spotted Lanternfly Nymphs are small and climb up the tree. They will get trapped at the bottom of the sticky band, so there is no need to have such a tall band. Penn State also urges homeowners to wrap the outside of the tree with chicken wire over the area of the sticky band. This will prevent squirrels, birds, and other small animals from becoming stuck to the band.

Check out Penn State’s informative video on how to band trees to capture Spotted Lanternfly:

How to build a circle trap
Penn State offers directions on how to build your own Spotted Lanternfly Circle Trap on their website.

How to Build a Circle Trap

If you’re concerned about trapping small animals and other wildlife in sticky bands, Penn State offers an alternative solution:

“Recent research has shown that an entirely different kind of type of trap is also very effective and can dramatically reduce the chances of capturing other creatures. This new style trap is made of plastic-coated insect screening and does not use any sticky material at all. It is basically a tunnel that SLFs walk into. When they move upward in the trap, they end up in a dead-end collection container where they die.” -extension.psu.edu

To view the complete directions on how to build your own Spotted Lanternfly Circle Trap, Click Here!

Are Treatments Available for Spotted Lanternfly Nymphs?

Unfortunately, treatment at the Nymph stage with insecticides is not always warranted.  Spotted Lanternfly Nymphs love to move around.  That’s why control is such a challenge.

Nymphs don’t stay on a single plant for long. To reach all the plants that might attract nymphs, your entire yard would have to be treated with a long, residual contact spray insecticide.  Even with these treatments, nymphs can still invade from other locations!

Also, although insecticide will kill Nymphs, it can also kill beneficial insects and pollinators, such as bees and butterflies. The insect experts at Giroud prefer to use these types of sprays for targeted control, not broad scale treatments.

Research shows that the best time to control Spotted Lanterfly is at the adult stage. However, there is an exception.   Nymph control may be warranted if the population is high enough to cause feeding damage (wilting stems).  Or, if Nymphs are focusing heavily on individual plants.  In these cases, your Giroud Arborist can evaluate the situation and determine if targeted treatment is required.

What’s the Solution for Controlling Spotted Lanterfly Nymphs?

Ultimately, the best way to combat Spotted Lanternfly during the Nymph Stage is with manual methods. Sticky bands, Circle Traps, and good old fashioned squishing are key to getting ahead of these awful insects before they reach adulthood!

Equally important, recognize that the Nymphs are a warning sign to get prepared.  By July or August, the Nymphs will turn into Adults.  That’s when the real trouble begins.  It’s also the time when control is most effective.  Adults don’t move around as much and tend to attack specific trees.  As a result, we can target the high risk trees and protect them from Spotted Lanternfly.

Researchers are anticipating a major infestation of Spotted Lanternfly this season.  Once the adults begin to swarm, we expect demand for treatment to surge and exceed our capacity.

If you are seeing Nymphs now or have high risk trees such as Maples or Willows, take action.  Call 215-682-7704 to schedule your FREE Property Inspection with a Giroud ISA Certified Arborist.  For more information, please visit Giroud’s Spotted Lanternfly Info Page.

Author: Jeanne Hafner

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  • Gary Young

    I have used “Home Defender spray” around the trunk of the tree, below the tape and have hundreds of dead and dying flys on the ground around the tree in addition to those stuck to the tape. Comments?

    • Cindy Giroud

      Hi Gary, I think you may be referring to “Home Defense.” We are not familiar with the product since it is formulated for home use. However it does appear to contain Bifenthrin, an ingredient recommended for Spotted Lanternfly control. While the product killed the pest on contact, you’ll need to monitor how long it lasts on the tree. Your use of tree bands is an excellent strategy for capturing Spotted Lanternfly in the nymph stages (May-July). Just be sure to change the bands every two weeks and cut them in half longwise to prevent accidentally trapping small animals. Giroud’s Spotted Lanternfly control program is based on the latest research by Penn State and the PA Department of Agriculture. Research has shown that pesticide treatments are most effective in the adult stage from July through November. You might also want to start checking your property for egg masses. Scraping them off now will help stop future generations. For more information on how to control this pest, check out: https://www.giroudtree.com/spotted-lanternfly/spotted-lanternfly-control/ Hope this helps! Please let us know if you have any other questions.