The Cost of Doing Nothing
SLF's Economic Toll
The economic case for aggressive control — in hard numbers. Data for journalists, researchers, policymakers, and grant writers.
Section 1
National Economic Projections
The numbers that define the stakes. These are the figures economists, federal agencies, and universities have put to the SLF invasion — sourced and citable.
Projected annual US economic losses at full eastern establishment
Source: Aukema et al., Cornell University / USDA APHIS (2019)
Jobs lost per year in Pennsylvania alone — worst-case projection
Source: Cornell University economic modeling, 2019
Annual losses to Pennsylvania wine industry
PA Department of Agriculture; American Vineyard Foundation
Total US horticultural and agricultural sector at risk
USDA economic modeling
USDA APHIS total investment in SLF response since 2014
USDA APHIS annual reports, 2014–2024
Year of first US detection — Berks County, PA — now the epicenter of economic data
Pennsylvania Department of Agriculture
Section 2
Impact by Sector
SLF does not harm all sectors equally. Here is the damage profile by industry — with severity rankings, documented losses, and primary sources.
Viticulture
WORST AFFECTED- PA vineyard losses 2014–2020 estimated at $18M+ total
- Average 30–80% yield loss in heavily infested vineyard blocks during peak adult season
- Some operations in Berks and Chester Counties folded entirely due to sustained pressure
- Honeydew secretion promotes sooty mold, coating clusters and making grapes unmarketable
- SLF weakens vines entering winter dormancy, causing cold injury and multi-year vine loss
Sources: PA Dept. of Agriculture; American Vineyard Foundation; Penn State Extension
Timber & Forestry
HIGH VALUE AT RISK- Primary threat to black walnut — a premium hardwood valued at $800–$2,000 per mature tree
- SLF stress depletes carbohydrate reserves, weakening tree immunity to secondary pathogens
- Repeated defoliation-equivalent stress can kill trees over 2–4 seasons
- Long-term stand composition changes expected as susceptible species decline in infested zones
- Forest Service modeling projects significant hardwood timber value erosion at full establishment
Sources: USDA Forest Service; Penn State College of Agricultural Sciences
Horticulture & Nurseries
QUARANTINE BURDEN- Nurseries in quarantine zones must obtain state permits to move plant material across state lines
- Compliance costs — inspections, certification, documentation, delays — absorbed 20–30% of some operations' margins
- Small nurseries absorbed disproportionate costs: no scale advantage in regulatory compliance
- Egg mass detection on nursery stock is the primary pathway for long-range SLF spread
Sources: USDA APHIS quarantine program data; PA Nursery & Landscape Association
Outdoor Recreation & Tourism
EMERGING IMPACT- Honeydew accumulation on trails, picnic tables, and park infrastructure is a documented nuisance
- PA state parks reported measurable increases in user complaints from 2018–2021 during peak infestations
- Sooty mold on outdoor dining surfaces affects restaurants and event venues in infested zones
- Aggregate tourism impact has not yet been formally studied — likely a significant undercounted cost
Sources: PA Department of Conservation & Natural Resources; anecdotal data from park operations
Section 3
What Treatment Costs
What property owners, growers, and municipalities are actually spending each year to manage SLF populations. These are real-world cost ranges, not projections.
Commercial vineyard
Integrated management program including monitoring, pyrethroid applications, kaolin clay, and systemic injections. Labor-intensive; highly variable by infestation pressure.
Homeowner (5 trees)
Professional systemic injection (dinotefuran or imidacloprid) for a residential property with 5 susceptible trees. Annual re-treatment required.
Municipal parks (large system)
Large park systems in heavily infested zones — covers tree injection programs, circle trap deployment, staff time, and contractor costs. Highly variable by park size.
Hop yard
Hops are a preferred host, requiring aggressive management. Costs include contact sprays, systemic applications, and increased scouting labor during July–September.
Cost ranges are 2022–2025 estimates based on published extension guidance and contractor survey data. Actual costs vary by region, infestation pressure, and treatment intensity.
Section 4
Research Investment
What USDA, state governments, and universities have spent trying to understand and contain SLF. These figures are a signal of how seriously the scientific and regulatory community takes the threat.
USDA APHIS
$65M+Total federal investment in SLF response since first detection in 2014 — covering detection surveys, biological control research, quarantine enforcement, and state grants.
Penn State Extension
12+ researchersPenn State has the largest dedicated SLF research program in the US, spanning entomology, plant pathology, viticulture, and forest health.
Biological control program
$10M+USDA ARS and cooperating universities have invested $10M+ since 2018 studying potential biocontrol agents, including the parasitoid wasp Anastatus orientalis from SLF's native range.
State programs (PA, NJ, VA, NY)
$30M+ combinedIndividual state appropriations for survey, outreach, and management programs since 2014 — Pennsylvania's program alone has exceeded $20M in state funding.
Section 5
The Multiplier Effect
SLF does not just harm one sector. It triggers a cascade of secondary economic effects that compound across industries and time horizons.
SLF weakens and kills high-value trees
Black walnut, grapevines, and ornamentals lose vigor, yield, and marketability.
Weakened trees and reduced yields depress property values
Vineyard land value tied to productive acres. Timber value drops with stand health.
Honeydew, sooty mold, and swarms reduce outdoor recreation value
Parks, trails, restaurants, and tourism destinations experience visitor complaints and reduced use.
Treatment costs layer onto every affected landowner
From $200/year homeowners to $200,000/year municipal park systems — mandatory ongoing cost.
Research spending diverts from other programs
$65M+ in federal funding is money redirected from other agricultural priorities.
Long-range spread multiplies all costs across new geographies
Each new county or state starts the cycle over — adding to national cumulative losses.
Bottom line: SLF is not a single-sector agricultural pest. It is a broad-economy problem that scales with delay. Every year of inaction extends the damage arc across new sectors and geographies.
Section 6
Early Action vs. Inaction
Cornell modeling makes the cost-benefit case unmistakably clear. The math strongly favors aggressive early intervention.
Projected annual US economic losses at full eastern establishment — if SLF spreads unchecked to all susceptible zones.
Source: Aukema et al., Cornell / USDA (2019)
Estimated current annual spending on SLF control programs across federal, state, and local sources — the current investment in prevention.
Source: USDA APHIS program estimates; Penn State Extension
The ratio: Every $1 spent now in aggressive early control prevents an estimated $40 in future losses — based on Cornell modeling of the difference between current trajectory and full-establishment projections. This is the economic argument for front-loading investment in detection, biocontrol, and public outreach.
Section 7
Cite This Page
For journalists, researchers, and grant writers: here are the primary sources behind the figures on this page. Go to the source for formal citation.
Aukema, J.E. et al. (2019)
Economic Impacts of Non-Native Forest Insects in the Continental United States
The Cornell/USDA study behind the $554M figure. The primary citable source for national economic projections.
USDA APHIS SLF Annual Reports (2014–2024)
Federal program annual reports covering detection, control, and budget
Source for $65M+ federal investment figure and quarantine zone data.
Penn State Extension — SLF Economic Impact Analysis
Pennsylvania-specific economic data for vineyards, nurseries, and timber
The most comprehensive state-level economic dataset on SLF impacts.
American Vineyard Foundation — SLF Viticulture Research
Industry-funded economic and agronomic research on vineyard impacts
For viticulture-specific inquiries, contact Paul Dray at American Vineyard Foundation: Paul@AVF.org
Contact: Paul Dray, AVF — Paul@AVF.org
Note for grant writers: The $554M/year figure (Aukema et al., 2019) is the most commonly cited national projection and is accepted by USDA APHIS, USDA NIFA, and major state agricultural agencies. For state-specific data, contact your land-grant university cooperative extension program. Penn State Extension is the most comprehensive source for Pennsylvania-specific figures.
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