![]() NYC Parks does not endorse or permit the use of traps to reduce SLF numbers, as they can trap and harm other insects, birds, or mammals.Parks is not currently considering widespread treatment due to uncertainty of the success of chemical treatments and the prohibitive cost however, we may treat limited high-value trees if deemed necessary.Parks is participating in an interagency working group with federal, state, and local agencies to coordinate surveying and treatment approaches.Caring for infested trees will follow Parks’ Tree Risk Management program - pruning and removing trees as they pose a risk to the public.What is NYC Parks Doing About Spotted Lanternflies? This fungus doesn’t seem to be an issue for the long-term health of the plants. Their feeding leaves behind a sticky residue called “honeydew” that can attract other insects and promote the growth of sooty mold. ![]() Their feeding alone does not usually kill trees, but it can, over time, weaken plants. They prefer Tree of heaven saplings and will also feed on black walnut, American beech, red maple, porcelain berry, and staghorn sumac. To feed, they pierce through the bark and suck on the sap. How SLF is affecting our ecosystems and landscapes The Tree of heaven ( Ailanthus altissima) is its preferred host tree. However, because SLF feeds on a wide range of agricultural crops, including walnut, grapes, hops, apples, blueberries, and stone fruits, the insect is considered a significant threat to agriculture. While they can infest trees, SLF are not considered a widespread threat to our city’s forests. Since Spotted Lanternflies are newcomers to North America, we’re still learning about them and how they interact with our ecosystems, including city parks and farms. The spotted lanternfly ( Lycorma delicatula–SLF) is a planthopper arriving from China, Taiwan, Japan, and Vietnam and was first discovered in New York City in 2019.
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