A potential serious crop and nuisance pest

Spotted Lanterfly

Spotted Lanternfly (Lycorma delicatula), or SLF

Spotted Lanternfly (Lycorma delicatula), or SLF, is an invasive insect first detected in Pennsylvania in 2014 and has since spread to at least 8 additional states (

SLF is a significant threat to the agriculture industry with the potential to cause serious damage to trees, vines, crops, and ornamentals. Honeydew, a sticky, sugary byproduct of SLF feeding, disturbingly rains down from trees and builds up, promoting the growth of sooty mold and attracting bees, wasps, and other insects.

SLF Egg Masses

Spotted Lanternfly (Lycorma delicatula), or SLF egg masses

Additionally, SLF is a residential nuisance pest and affects the quality of life for homeowners and tourists.

SLF Phenology

SLF has one generation per year and survives winter as egg masses. They are commonly laid on host trees, but females will lay their eggs in a variety of places including vehicles, stones, bricks, picnic tables, and other outdoor surfaces. Covered in a grayish putty-like substance, egg masses can become camouflaged against the substrate they are laid on, providing one method of assisted dispersal for SLF populations.

Two trap options are available; the PHEROCON® SLF Trap with Replaceable Bag design or the PHEROCON® SLF Trap with Reusable Full Season Reservoir. Both traps utilize the same bottom design that attaches to the tree trunk but have different top reservoirs for capturing SLF. The replaceable bag design allows for the whole bag to be replaced and disposed of once full, and the reusable reservoir can be emptied and reused over the entire season. Choice of trap design depends on user preference.

Trap with Replaceable Bag

PHEROCON® SLF Trap with Replaceable Bag design

SLF Trap with Reservoir

PHEROCON® SLF Trap with Reusable
Full Season Reservoir

Currently, there are no attractants identified for SLF. However, Trécé is conducting ongoing collaborative research with the USDA ARS to develop attractants. While current trap designs are useful, it is believed that effective attractants will improve these as management tools.


Traps should be placed by mid- to late-April. Attach one trap to the trunk of the host tree approximately 4 ft high. Secure trap against tree trunk by wrapping the bottom material tightly around the trunk using staples to secure the thickest part.


If SLF is captured outside quarantine zones, it should be reported to extension authorities or state department of agriculture. Many states, such as California, Michigan, Washington state, and Florida, among others, have quarantines in place or have released pest alerts to increase awareness.

For additional information regarding PHEROCON® SLF monitoring traps, please see the TRECE IPM PARTNER SLF Guidelines for Use.

Danielle KirkpatrickDanielle Kirkpatrick, Ph.D.
Global Technical Support Coordinator




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