They're back! With spotted lantern flies now established across much of the Mid-Atlantic, homeowners should stay alert this spring. The Montgomery County Extension Office warns that Montgomery County is experiencing an infestation of the Spotted Lanternfly (SLF). Spotted lanternfly do not feed on flowers, leaves or fruit. Instead, they eat phloem or sap from the trunks and stems of their host plants. They are also non-toxic if ingested by pets. Spotted lanternfly will not bite or sting you. They pose no danger to you or your pets. They are a significant stressor on plants.
The Spotted Lantern Fly is originally from China but showed up in Pennsylvania in 2012 probably as a stow away aboard a shipment of stone. As a non-native species of limited mobility without natural predators it is spreading rapidly largely through human assisted travel. Pennsylvania, Delaware, Virginia and New Jersey have all been affected and the Maryland Department of Agriculture has issued a 20 county plus Baltimore City quarantine to contain the SLF spread.
Adults females lay several egg masses, one inch in size, from September through December. Each mass contains up to 50 eggs each. Eggs can survive the winter and have been spotted from September to June, on flat surfaces including tree bark, rocks, lawn furniture, RVs or anything left outdoors.
Damage from SLF feeding with its piercing-sucking mouth parts can cause stunted growth, reduced yields, and lead to death of the host plant. As the insects feed, they excrete a sugary honeydew that collects and can attract other insects, as well as supporting growth of black sooty mold fungus that blocks sunlight from the leaves. SLF are particularly deadly to our local Virginia and Maryland vineyards. The SLF Nymphs are adjusting to their new territories and have been found feeding on an ever-expanding list of plants, including apples, apricots, blueberries, cherries, grapes, hops, nectarines, peaches, oak, pine and poplar, among many others.
Adults SLF prefer—and may need—to feed on tree of heaven (Ailanthus altissima), another non-native invasive species. The tree of heaven thrives in the poor soil conditions, which exist where road construction has disturbed topsoil. It now lines many of our highways which the bug may follow to eventually spread across the Washington region. The leaves of the tree of heaven are arranged in pairs across the plant's stem and are similar to native plants. It can be distinguished from native species by its fuzzy, reddish-brown twigs, clusters of light green seed pods and the stinky smell of its flowers.
You can help to protect local vineyards and native plants by preventing the spread of Spotted Lantern Fly in several ways. Learn the insect's unique appearance, it has a very distinctive appearance in each stage of development. Inspect plants in your area for adults, nymphs, or eggs. Check your vehicle for SLF egg masses that might hitch a ride, remove, and destroy them. You can pull the tree of heaven seedlings by hand before the taproot develops and place 'sticky-bands' around mature tree of-heaven trunks to trap nymphs during their daily up and down migration. Most importantly join the Squish Squad and squish as many of these invasive insects in any stage of development.
Kill spotted lanternfly adults and nymphs by crushing them with gloved hands, stomping on them by foot, or drowning them in a container of soapy water or rubbing alcohol (isopropyl alcohol).
Scrape egg masses off plants and hard surfaces such as lawn furniture, decks, and concrete surfaces using a plastic card or tool such as a putty knife. The eggs must then be crushed to kill them. Eggs can be crushed with gloved hands or dropped into a container of rubbing alcohol or hand sanitizer
Residents of all Maryland counties are urged to report observations of SLF to the Maryland Department of Agriculture (MDA) as soon as possible. Submit your report to the MDA online. Questions or concerns about this pest also may be sent by email to [email protected] or call (410) 841-5920. Try to collect a sample insect in a small bottle containing alcohol or take a good clear photo of the insect and email the photo to MDA.
Before traveling for business or pleasure, avoid taking these pests along by first referring to (PDF) Maryland Department of Agriculture Residential Checklist if you live in an area with Spotted Lanternfly. Your best effort is needed to stem the spread of the spotted Lantern Fly.
For more information, consult the Extension Service website Spotted Lanternfly Management for Residents | University of Maryland Extension (umd.edu) Dead (but not squished) specimens of any stage (with information on where and when they were collected) can be mailed or delivered to: Maryland Department of Agriculture Plant Protection & Weed Management 50 Harry S. Truman Parkway Annapolis, MD 21401