PROTECT YOUR PATIO
SPOTTED LANTERNFLYAND YOUR BUSINESS
Honeydew dripping from infested trees, sooty mold on furniture, insect swarms at dusk — SLF is a real problem for outdoor hospitality. These control measures work.
Spotted Lanternfly turns outdoor dining into a mess. Here's what works — and what doesn't.
The Impact on Your Business
Four ways SLF actively hurts outdoor hospitality revenue — and guest experience.
Honeydew Dripping on Guests
- →SLF excretes large amounts of sugary honeydew while feeding
- →This falls from trees onto everything below — tables, chairs, guests
- →In heavy infestations: visible drips, sticky surfaces, soiled clothing complaints
- →Peak: August–October (adult feeding season)
Sooty Mold on Furniture
- →Honeydew quickly grows sooty mold — a black coating on any surface
- →This coats umbrellas, table tops, chair arms, railings
- →Requires daily cleaning in heavy infestations
- →Makes outdoor spaces look poorly maintained
Insect Swarms at Dusk
- →Adults aggregate on tree trunks and building facades in the 2 hours before sunset
- →In heavy infestations, this is extremely visible and off-putting to guests
- →Adults occasionally fly into patrons, lighting, and open food/drinks
Wasp and Yellow Jacket Attraction
- →Honeydew attracts wasps, yellow jackets, and hornets to the area
- →This is often more of a guest concern than the SLF themselves
- →Removing the SLF feeding removes the wasp attraction
Control Options Ranked for Commercial Use
Five approaches, ranked by real-world effectiveness for outdoor hospitality settings. Start at option 1 if you can.
Tree Injection / Systemic Insecticide
- ✓Have a licensed arborist or pest control company inject dinotefuran or imidacloprid into trees above your patio
- ✓This kills SLF feeding in those specific trees, eliminating honeydew at the source
- ✓Effect lasts an entire season from a single application
- ✓Cost: Depends on tree size and number; typically $200–500 per tree for professional treatment
- ✓Must be done by a licensed applicator
- ✓Best timing: May–June (before adult season)
Remove or Treat Tree of Heaven Near the Property
- ✓If there's Tree of Heaven on or adjacent to your property, it's the primary SLF magnet
- ✓Contract with an arborist for removal (cut + stump treatment)
- ✓This is the highest-leverage action for any commercial property
- ✓One-time cost, permanent solution
Circle Traps on Nearby Trees
- ✓Can be installed on trees near the patio by you or a contractor
- ✓Passive collection, requires weekly emptying
- ✓Does not eliminate all SLF but reduces population pressure visibly
- ✓Lower cost than injections
Canopy Netting
- ✓Fine mesh shade structures over patio areas can physically block SLF from landing on guests and furniture
- ✓Works for smaller patio areas
- ✓Does not prevent honeydew if trees overhead are infested
Daily Cleaning Protocol
- ✓Wipe all surfaces with a damp cloth before service each day during August–October
- ✓Sooty mold can be removed with mild soap and water when fresh
- ✓Old, hardened sooty mold requires more effort — address it early
Action Timeline for Hospitality Venues
Month-by-month seasonal calendar. Timing matters — systemic treatments applied too late in the season lose most of their value.
March–April
Before season opens
- →Schedule arborist for tree injections — do this BEFORE adult season
- →Survey for Tree of Heaven on or adjacent to the property
- →Install circle traps on any ToH trees
May–June
Pre-season
- →Apply systemic insecticides (arborist)
- →Continue monitoring and refilling circle traps
July–August
Adult season begins
- →Brief your staff: "This is SLF season. Here's what we're doing about it."
- →Implement pre-service surface wipe protocol
- →Keep a log of guest complaints to document impact
September–October
Peak adult season
- →Peak adult season
- →Maximum cleaning protocol
- →This is the hardest month for outdoor hospitality in infested areas
November–March
Off-season prevention
- →Have staff look for and scrape egg masses from building exterior, patio furniture in storage, fences
- →This significantly reduces next year's population
Staff Briefing Card
Copy-paste this for your staff briefing or training. Fill in your manager name before distributing.
Template — Staff Notice
Copy & pasteSPOTTED LANTERNFLY SEASON — STAFF NOTICE From August through October, we may have higher-than-normal insect activity near our outdoor seating. This is from Spotted Lanternfly, an invasive pest. What it is: A large insect with a gray wing and red underwing. NOT dangerous — doesn't bite, doesn't sting. What you might see: Groups of insects on the building facade at dusk. Sticky residue on outdoor surfaces (honeydew). Black coating on surfaces (sooty mold). Our protocol: - Wipe all patio surfaces before service - If a guest mentions the insects, acknowledge it: "Yes, spotted lanternfly is active this time of year. We're treating the trees and cleaning daily. Can I get you [refresh/replacement/etc]?" - Do not spray any insecticides during service Report any surface problems to [manager name].
Key talking point: SLF does not bite or sting. Guest concern about the insects is understandable but manageable with a prepared, confident response.
For Farmers Markets and Outdoor Events
If you operate a farmers market, outdoor event, or pop-up venue, you face specific logistics that fixed-location venues don't.
Check Your Canopy Tents
Inspect canopy tents and pop-up structures for egg masses before storing for winter. A single tent can carry dozens into a new location next spring.
Inform Your Vendors
Inform vendors who set up under trees during peak season (August–October). They should know what honeydew and sooty mold look like on their goods and surfaces.
Request Site Treatment
Consider requesting that site management treat any Tree of Heaven on event property. One conversation with the site owner can eliminate the primary infestation source.
Report SLF From Your Venue
Your business's reports matter — commercial locations are high-traffic points that help researchers understand urban spread.
Related Guides
Circle Traps Guide
Every trap type reviewed — circle traps, sticky bands, and DIY options for commercial use.
Read guide →Tree of Heaven ID
Identify ToH on or near your property. If it's there, it's your primary SLF magnet.
Read guide →SLF Damage Guide
Identify honeydew trails, sooty mold, and tree damage before they become guest complaints.
Read guide →Monthly Season Alerts
Get monthly season alerts for business owners — timing reminders, treatment windows, and what to expect each month. Free.