The Spotted Lanternfly does not nibble, chomp, or chew on your leaves. No, it has a much more destructive method. It pierces.
It possesses a long, straw-like mouthpart that it jabs deep into the stems and trunks of trees to suck out the nutrient-rich sap. But the real problem comes next. As it feeds, it excretes a massive amount of a sugary, sticky waste called honeydew.
You would think honeydew sounds like a good thing. It is not. It is essentially bug barf. This sticky substance coats your patio furniture, your car, and the ground beneath the tree in a thick, sticky film. That sugary goop then acts as a magnet for a fungus called sooty mold. This black, powdery mold grows over the honeydew, suffocating the plant’s leaves and blocking out the sun they need for photosynthesis.
The result is that within just a few weeks, the leaves on your once-beautiful maple or grapevine can look like they have been dragged through a charcoal grill. The plant weakens, stops producing fruit, and can eventually die.
How to Identify the Spotted Lanternfly
To stop them, you have to know what you are looking for. The Spotted Lanternfly goes through several life stages, and they look very different depending on the time of year.
In late spring and early summer, you will find early nymphs. These are tiny, about one quarter inch, wingless, and black with white spots.
By mid-summer, the late nymphs appear. These are larger, up to one half inch, wingless, and striking red with black and white spots.
In late summer and fall, the adults emerge. These are about one inch long with gray forewings covered in black spots. When they fly, they flash those brilliant red hindwings with black spots that transition to white and black at the edges.
In fall and winter, look for egg masses. These look like small, grayish-brown blobs of mud or clay smeared on tree trunks, branches, patio furniture, or stones.
A helpful tip: Adults are notorious for their sudden, startling flight. They do not just buzz away. They flash that bright red and launch themselves with no warning. If you see that flash of red in your garden, it is time to go on the hunt.
How to Get Rid of Them: The Action Plan
Because they are an invasive species with no natural enemies in the United States, it is up to us to protect our trees and crops. Here is how to take back your yard.
The Circle Method
For a few rogue adults or nymphs, the most effective and immediate method is physical removal. Draw a circle around the bug with your foot, then step firmly on it. Squishing them is highly effective. Yes, it leaves a red stain, so wear shoes you do not mind getting dirty.
Scrape the Egg Masses
If you want to stop next year’s infestation before it starts, look for egg masses in the late fall and early spring. Use a plastic scraper or a dull putty knife to scrape the egg masses off trees, fences, or outdoor furniture. Drop them into a baggie filled with hand sanitizer or rubbing alcohol to destroy them.
Remove the Tree of Heaven
The Spotted Lanternfly’s absolute favorite host plant is the Tree of Heaven, which is itself an invasive weed tree. If you have this tree on your property, consider having it removed. If you must keep it, it can be used as a trap tree by applying systemic insecticides to it, which will kill the lanternflies when they feed on it.
Use Sticky Bands With Caution
You can wrap the trunks of your favorite trees, like maples or fruit trees, with sticky tape to catch the nymphs as they crawl up. However, standard sticky traps will also catch birds, bats, and beneficial insects. Always cover the sticky tape with a wire mesh or hardware cloth, like a little cage, so only the bugs can get through, keeping wildlife safe.