Adult and nymph spotted lanternfly. Photo Credit: USDA.
Adults spotted lanternfly. Photo Credit: Emelie Swackhamer, Penn State University, Bugwood.org
Multiple adult spotted lanternflies. Photo Credit: USDA.
Adult Spotted lanternfly with red hindwings. Photo Credit: USDA.
Spotted lanternfly nymphs. Photo Credit: USDA.
Spotted lanternfly egg mass on picnic table. Photo Credit: USDA.
Spotted lanternfly egg mass on pallet. Multiple adult spotted lanternflies.
Spotted lanternfly lifecycle. Photo Credit: Emily Damstra, Penn State Extension
The spotted lanternfly (SLF) is an emerging pest in the United States. SLF has not been detected in Oregon, but is present in several states on the East Coast. One of its preferred hosts is tree of heaven, however it will damage an array of important agricultural crops and trees including apples, cherries, hops, and grapes.
|Early Detection and Rapid Response species:||Yes|
|General Description:||Adult SLF have black-spotted, tan forewings that are often folded over its back. Its abdomens are yellow with black stripes.|
Egg masses are covered in a white putty-like substance which age over time to look like cracked mud. They are laid on smooth, hard surfaces such as trees stems, trailers, and patio furniture.
|Distinguishing Features:||Adult SLF resemble moths especially when its forewings are open. When its forewings are open its bright red and black-spotted hindwings are revealed.|
|Size:||1 inch (2.5 centimeters) long and 0.5 inches (1.25 centimeters) wide.|
|Life Cycle:||One generation per year. SLF lifecycle consists of an overwintering egg mass, four nymphal stages, and an adult stage. Adults are present from late July through December.|
- SLF feeds on a wide range of fruit, ornamental, and woody trees. Tree of heaven and grape vines are its preferred hosts.
- These host species are found throughout the Willamette Valley, including Washington County.
- SLF suck the sap from trees, vines, and crops. SLF causes plant stress that, in combination with other stressors, cause significant damage to its host tree. SLF alone may not kill a host plant.
- When these insects feed, they excrete a sugary substance, called honeydew. This substance encourages black sooty mold to grow and clings on clothing, hair, and fur, making outdoor activity unpleasant where large SLF populations are present.
- SLF is a major threat to the agricultural industry. The introduction of SLF to Oregon could result in the loss of millions of dollars and jobs to the wine, apple, beer, and hardwood industries.
What you we’re doing about it:
- Spotted lanternfly is a priority species for Tualatin SWCD. If identified within Washington County, a specially trained crew can verify the observation.
What you can do about it:
- If you think you’ve found spotted lanternfly in Oregon, please report it to the Oregon Invasive Species Hotline.
- SLF is not currently in Oregon, but it will likely feed on a tree of heaven first. Mapping tree of heaven locations gives experts a head start in case SLF does arrive in our region.
- Adult insects are present from July to December and egg masses are visible from September through April.
- SLF does not fly long distances, but it is a hitchhiker. Adults can hitchhike in vehicles, trains, or shipping containers. Egg masses are attached to hard, smooth surfaces that can be transported to new areas. If you are traveling from an area where SLF is present, closely inspect any materials before they are moved.
SLF is sometimes confused with other insects despite its unique appearance. Use this guide to identify SLF.