9.4 Pollinator Protection, Wildlife & Endangered Species

9.4 Pollinator Protection, Wildlife & Endangered Species

Quick Answer: Protecting non-target wildlife and ecological biodiversity is a cornerstone of professional pesticide stewardship. For pollinators, applicators must obey the EPA Pollinator Protection Box and Diamond Bee Icon, which legally prohibit foliar spraying of bee-toxic insecticides while crops or flowering weeds are in bloom and bees are foraging. Residual foliar toxicity is indexed by $RT_{25}$ (the hours required for residue toxicity to fall to 25% mortality). Microencapsulated (ME) formulations pose exceptional danger because bees transport electrostatic capsules back to the hive as "toxic pollen." For vertebrate wildlife, Second-Generation Anticoagulant Rodenticides (SGARs) present severe secondary bioaccumulation hazards to predatory hawks, owls, and foxes, requiring secured tamper-resistant bait stations. Finally, applicators must consult Bulletins Live! Two (BL2) to verify enforceable local restrictions protecting federally listed endangered species like the Karner blue butterfly.

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Pollinator Ecology & Agricultural Significance in New Hampshire

Pollinating insects are vital to the biodiversity and agricultural economy of New Hampshire. Effective stewardship requires applicators to safeguard both managed and wild pollinator communities:

• Managed European Honeybees (Apis mellifera): Commercial hives are trucked into New Hampshire orchards, berry farms, and vegetable fields each spring to pollinate high-value crops including apples, highbush blueberries, strawberries, pumpkins, and squash. A single commercial colony contains 20,000 to 60,000 foraging workers.
• Native Wild Pollinators: Over 200 species of native bees reside in New Hampshire, including bumblebees (Bombus spp.), mason bees (Osmia spp.), leafcutter bees, and solitary sweat bees. Native pollinators are often more efficient per visit than honeybees and emerge earlier in cold northern spring weather.
• Colony Collapse & Stressors: Pollinators face severe cumulative stresses, including Varroa mite parasitism, nutritional deficits from habitat fragmentation, and sublethal or lethal exposure to insecticides (notably systemic neonicotinoids and organophosphates).

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The EPA Bee Hazard Icon & Pollinator Protection Labeling

To safeguard pollinators, the EPA mandates prominent Pollinator Protection Language on all pesticide products containing active ingredients highly toxic to bees (e.g., neonicotinoids like imidacloprid, thiamethoxam, and clothianidin, as well as certain organophosphates and pyrethroids).

The Diamond Bee Icon

Applicators will find the Diamond Bee Hazard Icon prominently displayed in the "Directions for Use" section of the label, alerting them to mandatory behavioral restrictions:

• Foliar Application Restrictions on Flowering Crops: The label strictly prohibits foliar application of the product to target crops from the onset of flowering/bloom until petal fall is complete.
• Flowering Weeds in the Understory: The prohibition extends to non-target flowering weeds located in the crop understory, orchard floor, or field borders (e.g., dandelions, clover). If blooming weeds are present, the applicator must mow or chemically control the flowering ground cover before applying the bee-toxic insecticide, or wait until nightfall.
• Contracted Pollination Services vs. Non-Agricultural Use: For sites with paid pollination services under contract, applicators must notify commercial beekeepers at least 48 hours in advance, allowing beekeepers to cover or temporarily relocate hives.

Residual Foliar Toxicity ($RT_{25}$) & Formulation Hazards

Pesticide toxicity to bees is assessed across two distinct dimensions: intrinsic acute contact toxicity (expressed as topical $LD_{50}$ in micrograms per bee) and residual toxicity on plant foliage.

Understanding $RT_{25}$

$RT_{25}$ (Residual Toxicity 25%) is the scientifically measured time (in hours or days) required for weathered pesticide residues on exposed plant foliage to degrade to a level that causes 25 percent or less mortality in foraging worker honeybees brought into direct contact with the treated foliage in bioassays:

• High Residual Hazard ($RT_{25} > 8$ hours): Residues remain lethal to bees for an extended duration. Applying these products in the evening is insufficient because residues will still be toxic when bees begin foraging the following morning. Applications must be restricted to non-blooming periods.
• Moderate Residual Hazard ($RT_{25} = 2$ to 8 hours): Products can be safely applied in the late evening (after 7:00 PM or sunset), because residues degrade and dry below the lethal threshold before bees resume foraging at dawn.
• Low Residual Hazard ($RT_{25} < 2$ hours): Active ingredients break down or absorb into plant tissue within two hours. Once dry, the spray deposit presents minimal danger.

Formulation Hazards: The Microencapsulated Danger

The physical formulation of a pesticide dramatically influences its danger to pollinators:

• Microencapsulated Suspensions (ME / CS) — EXTREME HAZARD:
  • Microencapsulated products enclose liquid active ingredients inside microscopic synthetic polymer beads designed for slow, sustained release.
  • These microcapsules measure between 10 and 50 µm—identical in size and electrostatic charge to natural pollen grains.
  • Foraging honeybees cannot distinguish microcapsules from pollen. Static electrical charges on the bee's body hairs attract the capsules, which the bee combs into its pollen baskets (corbiculae).
  • The forager transports the concentrated toxic capsules back to the colony, storing them in beebread comb cells. Nurse bees feed this poisoned food to larvae, developing brood, and the queen, triggering catastrophic colony collapse weeks after the initial application.
• Dusts (D) and Wettable Powders (WP) — HIGH HAZARD: Dry powders readily adhere to electrostatic bee hairs and are carried back to hives.
• Emulsifiable Concentrates (EC) & Soluble Liquids (SL) — MODERATE TO LOW HAZARD: Liquid formulations soak into foliage and dry without leaving electrostatic particulate residues, presenting far less pick-up hazard once thoroughly dry.
• Granules (G) — LOWEST HAZARD: Granular formulations applied to soil fall below the vegetative canopy and present negligible direct contact hazards to foraging pollinators.

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Operational Pollinator Protection Protocols

Commercial and private applicators can effectively eliminate bee poisonings by implementing five practical operational rules:

1. Respect Diurnal Foraging Windows: Bees forage actively when sunlight is bright and temperatures exceed 55°F to 60°F (13°C–16°C). The safest operational window is late evening (from twilight to 11:00 PM). Applying at night allows the spray deposit several hours of dark, cool conditions to dry completely before bees leave the hive at sunrise.
2. Manage Understory Flora: Prior to applying any insecticide in an orchard or turf area, mow or flail the ground cover to remove blooming dandelions, white clover, and other flowering broadleaf weeds.
3. Coordinate with Local Beekeepers: Establish direct communication with apiarists within 2 to 3 miles of the treatment parcel. Consult the New Hampshire Department of Agriculture, Markets & Food (NHDAMF) Apiary Program registry.
4. Never Apply During Inversions or High Wind: Drifting droplets settling on bordering wildflowers or native hedgerows cause severe off-target pollinator kills.
5. Avoid Microencapsulated Formulations Near Blooming Forage: Choose EC or water-soluble formulations over ME or dusts whenever pollinators are present in the agricultural landscape.

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Aquatic Ecotoxicity: Pyrethroids & Organophosphates

Pesticides entering New Hampshire's cold-water rivers, lakes, and pristine trout streams pose acute toxicity hazards to aquatic life:

• Cold-Water Salmonid Fish: Brook trout (Salvelinus fontinalis) and Atlantic salmon are exceptionally sensitive to chemical contamination and dissolved oxygen depletion.
• Synthetic Pyrethroids (e.g., bifenthrin, permethrin, lambda-cyhalothrin): While possessing favorable mammalian safety margins, pyrethroids exhibit extraordinary acute ecotoxicity to fish and aquatic macroinvertebrates (mayflies, stoneflies, and Daphnia). Median lethal concentrations ($LC_{50}$) for aquatic organisms often lie in the low parts-per-billion (ppb) or parts-per-trillion range. Pyrethroids disrupt ion channels in gill membranes, causing immediate osmotic collapse and asphyxiation.
• Mitigation: Maintain strict 25-foot untreated buffers from surface water, avoid applications prior to forecast heavy rains, and install vegetative filter strips to intercept sediment runoff.

Wildlife Bioaccumulation & Rodenticide Secondary Poisoning

Rodenticides used in structural and agricultural pest management represent a severe toxic hazard to non-target predatory wildlife.

First-Generation vs. Second-Generation Anticoagulants

Anticoagulant rodenticides function by disrupting the enzyme vitamin K epoxide reductase, halting the synthesis of critical blood-clotting factors (prothrombin) in the liver. Within 3 to 7 days, exposed animals perish from fatal internal hemorrhaging.

• First-Generation Anticoagulant Rodenticides (FGARs):
  • Active Ingredients: Warfarin, chlorophacinone, diphacinone.
  • Characteristics: Rapidly metabolized and excreted by rodents. A target rodent must consume multiple consecutive feedings over several days to accumulate a lethal dose. Residues in liver tissue dissipate relatively quickly.
• Second-Generation Anticoagulant Rodenticides (SGARs):
  • Active Ingredients: Brodifacoum, bromadiolone, difethialone, difenacoum.
  • Characteristics: Engineered to overcome rodent resistance. Lethal after a single feeding. SGARs possess extreme lipophilicity and bind tenaciously to liver tissue, with metabolic elimination half-lives exceeding 150 to 350+ days.

The Secondary Poisoning Pathway in Predators

Because SGARs require 3 to 7 days to cause death, an intoxicated rat or mouse continues to feed on bait, accumulating multiple lethal doses in its liver. As internal bleeding begins, the rodent becomes lethargic, uncoordinated, and stumbles into open outdoor areas in broad daylight.

These intoxicated rodents become easy prey for raptors and mammalian carnivores:

• Avian Predators: Red-tailed hawks, barred owls, great horned owls, and bald eagles.
• Mammalian Predators: Red foxes, coyotes, bobcats, weasels, and domestic dogs and cats.
• Toxicity Manifestations: Predators accumulate SGAR residues across dozens of prey feedings. This bioaccumulation leads to spontaneous fatal internal bleeding, severe anemia, hypothermia, and increased susceptibility to secondary infections (such as notoedric mange in wild foxes and bobcats).

EPA Risk Mitigation & Regulatory Safeguards

To curb wildlife devastation, the EPA enacted strict Risk Mitigation Decisions (RMDs) for rodenticides, reinforced under New Hampshire administrative rules:

• Consumer Ban: SGAR products are strictly prohibited from consumer retail distribution for outdoor lawn and garden use.
• Mandatory Tamper-Resistant Bait Stations: All outdoor above-ground anticoagulant bait applications by certified applicators must be housed inside locked, secured, EPA Tier 1 tamper-resistant bait stations.
• Distance Restrictions: Outdoor bait station placements are strictly limited to within 50 to 100 feet of man-made structures (homes, commercial buildings, barns) where rodent infestations originate, preventing placement in open fields or wildlife corridors.
• Carcass Disposal: Applicators and facility managers must regularly inspect treated properties and immediately collect and deeply bury or incinerate poisoned rodent carcasses.

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Endangered Species Protection Program (ESPP) & Bulletins Live! Two

Under the Endangered Species Act (ESA), federal agencies must ensure that registered pesticide uses do not jeopardize the continued existence of federally listed threatened or endangered species or adversely modify their critical habitats.

The Legal Mechanism: Label Referral to Bulletins Live! Two

Pesticide product labels cannot list hundreds of dynamic, geographically shifting endangered species habitats. Instead, the EPA established the Endangered Species Protection Program (ESPP) utilizing an enforceable online web system called Bulletins Live! Two (BL2):

1. Label Mandate: Product labels contain a specific ESPP referral statement: "Endangered Species Protection Requirements: It is a federal violation to use this product in a manner that harms an endangered species. You must check Bulletins Live! Two to determine if any geographic restrictions apply to your intended application site."
2. The Six-Month Rule: Applicators must access the EPA Bulletins Live! Two online mapping tool within 6 months prior to the planned application (or within the specific month of application designated by the product label).
3. Identifying PULAs: The applicator inputs the intended application location, state, county, and month of treatment. The software displays whether the site falls inside an active Pesticide Use Limitation Area (PULA).
4. Mandatory Limitations: If the site is within a PULA, the generated Bulletin specifies legally binding mitigation measures—such as mandatory untreated spray buffers, prohibitions on specific application methods, vegetative filter strips, or complete bans on particular active ingredients.
5. Legal Status: Under FIFRA and RSA 430, the printed Bulletin is a legally binding extension of the pesticide label. Failing to obtain and follow the Bulletin constitutes a federal and state pesticide violation.

New Hampshire Focal Species: The Karner Blue Butterfly

A prominent example of endangered species protection in New Hampshire involves the Karner blue butterfly (Lycaeides melissa samuelis):

• Habitat: Inhabits globally rare pine barrens and oak savannas in the Merrimack River valley (notably the Concord Pine Barrens).
• Obligate Relationship: Larvae feed exclusively on the leaves of a single wild plant: the wild blue lupine (Lupinus perennis).
• Applicator Obligation: Broadleaf herbicides or foliage-applied insecticides sprayed near Concord Pine Barrens habitats could destroy the obligate host plant or directly kill developing butterfly larvae, triggering stringent PULA restrictions under Bulletins Live! Two.