Spotted Lanternfly in Gloucester County, NJ: What Homeowners and Farmers Need to Do Now

Spotted Lanternfly Is Established Throughout All of Gloucester County

The spotted lanternfly (Lycorma delicatula) has now been confirmed in every one of Gloucester County's 24 municipalities — from Deptford and Washington Township in the north to Elk Township and Franklin Township in the rural south. This invasive pest from China has spread aggressively across New Jersey since its first detection in the state in 2018, and Gloucester County's diverse landscape of residential neighborhoods, preserved farmland, and agricultural operations makes it particularly vulnerable to population explosions.

Gloucester County does maintain a Mosquito Control and Pest Division that monitors pest populations countywide, but it is important for homeowners and farmers to understand: this division does not provide spotted lanternfly treatment on private residential or agricultural properties. If you want to protect your trees, orchard, vineyard, or garden, professional pest control is your only option.

How to Identify Spotted Lanternfly at Every Life Stage

Spotted lanternflies look dramatically different depending on the time of year, and knowing what to look for at each stage is critical for early detection and reporting.

• Egg masses (September through June): Gray-brown, putty-like patches approximately 1 inch long, deposited on any smooth surface — tree bark, stone walls, fencing, outdoor furniture, vehicles, and even railroad ties. Each egg mass contains 30 to 50 eggs arranged in neat rows. Egg masses laid in fall remain viable through winter and hatch in spring.
• Early nymphs (April through June): Small black insects about a quarter-inch long with white spots. They are wingless and move in quick, erratic hops. Found on new plant growth, particularly on tree of heaven and grapevines.
• Late nymphs (July through August): Larger nymphs develop red patches alongside black and white spots. Still wingless but increasingly mobile and visible on plant stems and tree trunks.
• Adults (August through December): Approximately one inch long with distinctive gray-brown forewings covered in black spots. When the wings open in flight, vivid red hindwings with black spots are visible. Adults are the most damaging stage — they feed heavily to build reserves before winter.

What Spotted Lanternfly Damages in Gloucester County

Spotted lanternfly feeds on the phloem (sap) of more than 70 plant species. While they are not structural pests and will not damage your home, the agricultural and horticultural impact can be severe. The farms and vineyards of Harrison Township, Elk Township, and Franklin Township are at particular risk:

• Fruit trees: Apples, peaches, plums, cherries, and nectarines are among their preferred hosts. Heavy feeding stress can reduce fruit production and weaken trees over multiple seasons.
• Grapevines: East Greenwich Township and the growing craft viticulture operations in southern Gloucester County face serious vineyard threats. Spotted lanternflies can significantly reduce grape yield in heavily infested vineyards.
• Tree of heaven (Ailanthus altissima): The invasive tree that grows prolifically along roadsides, fence lines, and disturbed areas throughout Gloucester County is spotted lanternfly's most preferred host plant. Large tree of heaven populations act as breeding reservoirs that sustain enormous lanternfly populations through the season.
• Ornamental and hardwood trees: Maple, oak, black walnut, and ornamental plantings in residential landscaping can suffer stress from heavy feeding pressure.
• Hops: Important for craft brewing operations in the region.

Beyond direct plant damage, spotted lanternflies excrete large amounts of sticky liquid waste called honeydew. This honeydew coats leaves, outdoor furniture, decks, and surfaces beneath infested trees, promoting the growth of black sooty mold that further stresses plants and makes outdoor spaces unpleasant.

Treatment: What Actually Works Against Spotted Lanternfly

DIY efforts with consumer products have limited effectiveness against spotted lanternfly, particularly for tree protection and agricultural applications. Two professional treatment methods provide the best results:

Contact insecticide treatment: Professional-grade contact insecticides applied to vegetation, tree trunks, and outdoor surfaces kill spotted lanternflies on contact. This is effective for immediate population knockdown during the peak adult season from August through November. Because contact insecticides have limited residual activity against spotted lanternflies, multiple applications are typically required through the season for sustained control around Mullica Hill orchards, East Greenwich vineyards, and Franklin Township agricultural areas.

Systemic tree injection: Systemic insecticides injected directly into a tree's vascular system are translocated throughout the tree, killing lanternflies as they feed on the treated plant. This method provides extended protection through an entire season from a single application and is particularly valuable for protecting high-value fruit trees, grapevines, and specimen ornamentals. It is also the preferred method for trees in areas where broad spray applications are impractical.

Egg Mass Destruction: The Highest-Impact DIY Action

While professional treatment is essential for active infestations, homeowners throughout Washington Township, Monroe Township, and all of Gloucester County can meaningfully reduce local populations by scraping and destroying egg masses. Each egg mass you destroy prevents 30 to 50 lanternflies from hatching. Egg masses are present from September through June — look for gray-brown waxy patches on tree bark, stone walls, fence posts, retaining walls, outdoor furniture, grills, and vehicles parked near trees.

To destroy egg masses: scrape them into a sealable bag containing hand sanitizer or rubbing alcohol, then dispose of the sealed bag. Do not simply scrape them onto the ground — the eggs can remain viable.

Protect Your Gloucester County Property Before Egg Hatch Season

Spotted lanternfly egg hatch typically begins in late April in southern New Jersey and peaks in May. Contacting a professional before eggs hatch allows for early-season nymph treatment when populations are most vulnerable. Call Gloucester County Pest Control at (856) 372-5092 for a property assessment and treatment plan. We serve all 24 municipalities of Gloucester County, including agricultural properties in Elk Township, Franklin Township, and Harrison Township, and residential properties throughout Washington Township, Deptford, Monroe Township, and Glassboro.