The Spotted Lanternfly (SLF) is an invasive pest that poses a great threat to California's agriculture. It was first discovered in the U.S. in Pennsylvania in 2014 and has since taken the east coast by storm, causing damage to many plant species and proving to be difficult to control. Although this pest hasn't been found in California, it is important to keep an eye out to catch an invasion early.
What does the spotted lanternfly look like?
The SLF adult is about 1 inch in length with grayish wings, black spots, and red hind wings. Egg masses are laid in the fall on the east coast and resemble splotches of mud. They are often laid on smooth surfaces like branches, rocks, or outdoor furniture. Early nymphs are very small, wingless, and black with white spots. The last nymphal stage is 1/2 inch long and red with white and black markings.
What damage does the spotted lanternfly cause?
On the east coast, the spotted lanternfly's preferred host is the invasive tree-of-heaven (Ailanthus altissima), but it will also feed heavily on grapes, maples, willows, and birch trees. SLF feeds on plant sap and excretes honeydew, which can cause sooty mold to grow on leaves and fruit. It is known to kill black walnut saplings, tree-of-heaven, and grapevines. However, for most other plants SLF is considered a plant stressor and healthy plants can usually tolerate feeding.
What can you do to help keep the spotted lanternfly out?
Spotted lanternfly is easily transported to new areas as egg masses on firewood, stone, cars, and furniture. Check vehicles and trailers when traveling to areas where SLF has been confirmed. Inspect items purchased or shipped from these areas, and don't move firewood. Familiarize yourself with the various ways that SLF egg masses may appear and report any potential sightings to the CDFA Pest Hotline: 1-800-491-1899.
If you want to learn more, visit the UC IPM Spotted Lanternfly page and consider taking the California Master Gardener Spotted Lantern Fly training module.
- Author: Lauren Snowden
UC Master Gardener Program partner PlantRight had an information packed LIVE talk about their efforts to phase out invasive plants in California. Alex Stubblefield, PlantRight project manager led the LIVE talk featuring their mission, partners, work and what we can do to help stop invasive plants. If you didn't get to join us LIVE you can watch the video below.
Here is a quick written recap of the LIVE talk:
What is an invasive plant?
An invasive plant is a plant that is non-native to the ecosystem under consideration, and whose introduction is likely to cause economic or environmental harm, or harm to human health. Visit PlantRight's website for more detail.
What's the problem?
Invasive plants harm California's environment and economy in many ways. They can overtake crops or rangeland; harm wildlife by eliminating plants they need for food and shelter; clog waterways used for commerce or recreation; and increase fire hazards and flood risk.
What's the alternative?
There is no shortage of superior alternatives. The vast majority of garden plants are well behaved and will never become an invasive problem. Our plant list includes several suggested alternatives for each invasive plant.
How can I help?
Be a part of the solution by planting right. Whether you are a retail nursery, grower, landscape professional, or home gardener — everyone can play a critical role in preventing the spread of invasive plants. PlantRight has many educational resources and materials available online to read and share.
Plants to watch!
Although the list of plants PlantRight is currently working with is not all-inclusive there is a list of plants to watch. Find the current list of plants to watch on their website.
LIVE Series
To see past LIVE talks and what is coming up please visit the LIVE series web page.
Attention UC Master Gardener Volunteers: Whether you join LIVE or watch the recording, be sure to record your continuing education hours in the Volunteer Management System.
