6.3 Endangered Species & Habitat Protection

The EPA Endangered Species Protection Program

The Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) requires the EPA to ensure that registered pesticide uses do not jeopardize federally listed endangered or threatened species or destroy their critical habitat. The EPA implements this through the Endangered Species Protection Program (ESPP). For most applicators, the program shows up as a Bulletins Live! Two county-level Bulletin and as specific language on the pesticide label.

A Bulletin is an EPA-issued document that lists pesticide-use limitations for a defined geographic area (usually a county or a portion of a county) where a listed species occurs. Bulletins can impose:

• Application rate caps below the label maximum,
• Timing restrictions (for example, no application during a species' breeding season),
• Buffer zones around critical habitat, and
• Total prohibitions on certain products in defined areas.

The key rule on the exam: where a Bulletin and a label differ, follow the more restrictive of the two. A label may allow a certain rate, but if the county Bulletin caps that rate lower or bans the use during a listed species' flight season, the Bulletin controls. Before applying any restricted-use pesticide — and increasingly any pesticide in a flagged county — the applicator must check Bulletins Live! Two by county, active ingredient, and application month.

Michigan's Listed Species and Habitats

Michigan hosts a range of federally listed endangered and threatened species that applicators should be able to recognize. The most commonly tested examples include:

• Karner blue butterfly — a small blue lycaenid whose caterpillars feed only on wild lupine in oak savanna habitats. Michigan's remaining Karner blue populations are concentrated in the western Lower Peninsula (Newaygo, Oceana, Muskegon, and Allegan counties). Herbicide drift into lupine-barren habitat is a direct threat; the Bulletin restricts certain herbicide and insecticide applications in these counties during the butterfly's flight and larval periods.
• Freshwater mussels — Michigan streams and rivers host several listed mussels, including the snuffbox and clubshell. Mussels are highly sensitive to pesticide drift, runoff, and any contamination of their host water; buffer zones from labeled streams are common Bulletin restrictions.
• Piping plover — a small shorebird that nests on Great Lakes beaches. Beach and dune habitats near the Lake Michigan and Lake Huron shorelines are critical habitat; applicators treating beachgrass or dune vegetation must follow Bulletins that limit pesticides near nesting areas during the breeding season (roughly May through July).
• Kirtland's warbler — a small songbird that nests in young jack pine stands in the northern Lower Peninsula. Although the warbler was removed from the federal endangered list in 2019, it remains state-listed and a conservation focus, and some Bulletin areas still reflect habitat protection.

The exam does not require memorizing every listed species, but it does expect you to know that Bulletins exist, that they are county-specific, that they can be more restrictive than the label, and that Michigan has several species and habitats that trigger them.

Habitat Protection: Beyond the Listed Species Itself

Protecting a listed species means protecting its habitat, not just avoiding direct contact with the animal. For the Karner blue butterfly, that means protecting wild lupine stands and the oak savanna that supports them. For freshwater mussels, it means protecting the stream reach where the larvae attach to host fish, which can extend far upstream of the mussel bed itself. For piping plovers, it means protecting the open beach and dune zone where plovers nest and feed chicks. An applicator whose treated field is adjacent to any of these habitats must treat the field edge as a sensitive site: maintain buffers, control drift, and avoid any application that could reach the habitat through air or water.

Pollinator Protection

Pollinator protection is a separate but related label requirement. Most insecticide labels and many fungicide labels now carry a pollinator protection statement or a Bee Advisory box that limits how the product may be applied when bees are present. The core pollinator-protection practices are:

1. Do not apply while the crop or weeds are in bloom if bees are visiting the site. If bloom is unavoidable (for example, on a blooming fruit crop), follow the label's bloom restrictions exactly.
2. Apply in the evening or at night when foraging bees have returned to the hive. Evening application dramatically reduces direct contact exposure.
3. Communicate with beekeepers whose hives are within flight range (commonly up to 2–3 miles). Michigan has a voluntary hive registry; notify nearby beekeepers before treating so they can close hives or move them.
4. Follow the label's pollinator protection statement — it may impose tank-mix restrictions, adjuvant bans, or specific application windows.
5. Avoid drift onto flowering plants in field borders and hedgerows — these are pollinator forage even when the crop itself is not blooming.

The exam often tests the timing recommendation specifically: the correct answer for reducing bee exposure is evening application when bees are not foraging. It also tests the role of communication — telling beekeepers before you treat is a recognized best practice, not a courtesy.

Working With Labels and Bulletins Together

A useful workflow before every application in a listed-species county:

1. Read the label fully, including any Bee Advisory box and endangered-species statement.
2. Look up the county Bulletin on EPA's Bulletins Live! Two site by active ingredient and application month.
3. Identify any listed-species habitat within a quarter-mile of the application site — streams, lupine savanna, beach and dune, jack pine stands.
4. Apply the more restrictive of the label or Bulletin.
5. Document the Bulletin check in your application records.

Exam Scenario

A question may describe an applicator who reads a label allowing a certain rate but then finds the county Bulletin capping the rate during the Karner blue butterfly flight season. The correct action is to follow the Bulletin, because Bulletins override the label where more restrictive. Another common item asks how to minimize bee exposure when treating a blooming crop adjacent to hives; the answer is to apply in the evening after bees have returned to the hive, after notifying the beekeeper.