Insects of Ohio

Insects represent the most diverse and ecologically influential group of animals in Ohio. With more than 20,000 estimated species, insects occupy every terrestrial and freshwater habitat in the state, from Appalachian forests to Lake Erie wetlands and agricultural plains. They serve as pollinators, decomposers, predators, prey, and ecosystem engineers. This article provides an academic overview of Ohio’s insect fauna, including distribution, abundance, ecological roles, life cycles, seasonal activity, and conservation concerns. Charts summarize major insect groups across the state’s ecological regions.

Ohio’s Insect Diversity and Regional Patterns

Ohio’s four major ecological regions support distinct insect communities shaped by vegetation, climate, soil type, and land use.

Regional Insect Distribution Chart

Region	Dominant Habitat	Common Groups	Representative Species	Rare or Sensitive Species
Appalachian Ohio	Forests, streams, rocky slopes	Beetles, moths, dragonflies	Luna Moth, Tiger Beetles	Green Salamander-associated insects
Lake Erie Basin	Wetlands, marshes, dunes	Dragonflies, damselflies, mosquitoes	Lake Darner, Ebony Jewelwing	Lake Erie Cicada
Central Till Plains	Farmland, riparian corridors	Bees, butterflies, grasshoppers	Monarch Butterfly, Honey Bee	Rusty Patched Bumble Bee
Western Lake Plains	Prairies, wet meadows	Grasshoppers, leafhoppers, wasps	Prairie Cicada, Regal Fritillary	Eastern Massasauga-associated pollinators

Insect richness is highest in Appalachian Ohio due to forest complexity and microhabitat diversity. Wetland insects dominate the Lake Erie Basin, while pollinators and agricultural pests are most abundant in the Central Till Plains.

Sources

Ohio Department of Natural Resources (ODNR). United States Environmental Protection Agency (EPA) Ecoregions. Xerces Society for Invertebrate Conservation.

Major Insect Groups in Ohio

Ohio’s insects can be broadly categorized into several ecologically significant groups: pollinators, predators, decomposers, aquatic insects, and agricultural pests.

Pollinators

Pollinators are essential to Ohio’s agriculture and native plant communities.

Abundance and Distribution

Species	Appalachian	Lake Erie Basin	Central Till Plains	Western Lake Plains
Honey Bee	Medium	Medium	High	High
Bumble Bees	High	Medium	Medium	Medium
Monarch Butterfly	Medium	Medium	High	High
Swallowtail Butterflies	High	Medium	Medium	Medium
Leafcutter Bees	Medium	Medium	High	Medium

The Central Till Plains support the highest pollinator abundance due to extensive flowering crops and edge habitats.

Habitat Use

Group	Primary Habitat	Secondary Habitat
Honey Bees	Agricultural fields	Urban gardens
Bumble Bees	Meadows, prairies	Forest edges
Butterflies	Flowering meadows	Roadsides
Solitary Bees	Bare soil, stems	Gardens

Diet

Group	Diet
Bees	Nectar, pollen
Butterflies	Nectar
Moths	Nectar, fermenting fruit
Hoverflies	Nectar, pollen

Breeding Cycles

Group	Breeding Season	Notes
Bees	April–September	Colony cycles vary
Butterflies	May–August	Multiple broods
Moths	April–October	Many nocturnal species

Seasonal Activity

Season	Activity
Winter	Dormant
Spring	Increasing
Summer	Peak
Fall	Declining

Sources

Xerces Society Pollinator Conservation. ODNR Insect Profiles. USDA Pollinator Studies.

Predatory Insects

Predatory insects regulate pest populations and maintain ecological balance.

Abundance and Distribution

Species	Appalachian	Lake Erie Basin	Central Till Plains	Western Lake Plains
Praying Mantises	Medium	Medium	High	Medium
Lady Beetles	High	Medium	High	High
Dragonflies	High	High	Medium	Medium
Ground Beetles	High	Medium	Medium	Medium
Assassin Bugs	Medium	Medium	Medium	Medium

Habitat Use

Species	Habitat
Praying Mantis	Meadows, gardens
Lady Beetles	Crops, shrubs
Dragonflies	Wetlands, streams
Ground Beetles	Forest floors
Assassin Bugs	Shrublands

Diet

Species	Diet
Praying Mantis	Insects, spiders
Lady Beetles	Aphids, mites
Dragonflies	Mosquitoes, flies
Ground Beetles	Caterpillars, larvae
Assassin Bugs	Insects

Breeding Cycles

Species	Breeding	Notes
Mantises	Summer	Egg cases overwinter
Dragonflies	Spring–Summer	Aquatic larvae
Lady Beetles	Spring–Fall	Multiple broods

Seasonal Activity

Season	Activity
Winter	Dormant
Spring	Medium
Summer	High
Fall	Medium

Sources

ODNR Dragonfly Surveys. Ohio Biological Survey. Journal of Insect Conservation.

Decomposer Insects

Decomposers recycle nutrients and maintain soil health.

Abundance and Distribution

Species	Appalachian	Lake Erie Basin	Central Till Plains	Western Lake Plains
Dung Beetles	Medium	Medium	High	High
Carrion Beetles	High	Medium	Medium	Medium
Termites	Medium	Low	Medium	Medium
Springtails	High	High	High	High
Ants	High	High	High	High

Habitat Use

Group	Habitat
Dung Beetles	Pastures, forests
Carrion Beetles	Forests
Termites	Dead wood
Springtails	Soil, leaf litter
Ants	Soil, logs

Diet

Group	Diet
Dung Beetles	Animal waste
Carrion Beetles	Dead animals
Termites	Cellulose
Springtails	Fungi, detritus
Ants	Omnivorous

Breeding Cycles

Group	Breeding
Beetles	Spring–Fall
Termites	Year‑round
Ants	Nuptial flights in summer

Seasonal Activity

Season	Activity
Winter	Low
Spring	Medium
Summer	High
Fall	Medium

Sources

Ohio Biological Survey. USDA Soil Ecology Reports. Entomological Society of America.

Aquatic Insects

Aquatic insects are indicators of water quality and form the base of freshwater food webs.

Abundance and Distribution

Species	Appalachian	Lake Erie Basin	Central Till Plains	Western Lake Plains
Mayflies	High	High	Medium	Medium
Stoneflies	High	Medium	Low	Low
Caddisflies	High	Medium	Medium	Medium
Water Boatmen	Medium	High	Medium	Medium
Mosquitoes	Medium	High	Medium	Medium

Habitat Use

Group	Habitat
Mayflies	Clean streams
Stoneflies	Cold streams
Caddisflies	Streams, rivers
Water Boatmen	Ponds, wetlands
Mosquitoes	Standing water

Diet

Group	Diet
Mayflies	Algae, detritus
Stoneflies	Algae or insects
Caddisflies	Detritus, algae
Water Boatmen	Algae
Mosquitoes	Nectar (adults), blood (females)

Breeding Cycles

Group	Breeding
Mayflies	Spring–Summer
Stoneflies	Winter–Spring
Caddisflies	Spring–Fall
Mosquitoes	Spring–Fall

Seasonal Activity

Season	Activity
Winter	Low
Spring	High
Summer	High
Fall	Medium

Sources

Ohio EPA Biological Monitoring Program. USGS Aquatic Insect Studies. Freshwater Invertebrates of North America.

Agricultural Pests

Ohio’s agricultural landscapes support numerous insect pests that affect crops.

Abundance and Distribution

Species	Appalachian	Lake Erie Basin	Central Till Plains	Western Lake Plains
Corn Rootworm	Low	Medium	High	High
Soybean Aphid	Low	Medium	High	High
Japanese Beetle	Medium	High	High	High
Armyworm	Medium	Medium	High	High
Stink Bugs	Medium	Medium	High	High

Habitat Use

Species	Habitat
Corn Rootworm	Cornfields
Soybean Aphid	Soybeans
Japanese Beetle	Lawns, crops
Armyworm	Grasses
Stink Bugs	Crops, orchards

Diet

Species	Diet
Corn Rootworm	Corn roots
Soybean Aphid	Plant sap
Japanese Beetle	Leaves, flowers
Armyworm	Grasses
Stink Bugs	Plant juices

Breeding Cycles

Species	Breeding
Corn Rootworm	Summer
Soybean Aphid	Spring–Fall
Japanese Beetle	Summer
Armyworm	Spring–Summer
Stink Bugs	Summer

Seasonal Activity

Season	Activity
Winter	Dormant eggs
Spring	Increasing
Summer	Peak
Fall	Declining

Sources

USDA Agricultural Research Service. Ohio State University Extension Entomology. ODNR Pest Management Reports.

Insect Food‑Web Roles in Ohio Ecosystems

Appalachian Ohio Food Web

Level	Species
Producers	Forest plants
Primary Consumers	Caterpillars, leafhoppers
Secondary Consumers	Dragonflies, mantises
Tertiary Consumers	Birds, bats

Lake Erie Basin Food Web

Level	Species
Producers	Wetland plants
Primary Consumers	Mosquito larvae, mayflies
Secondary Consumers	Water beetles
Tertiary Consumers	Fish, amphibians

Western Lake Plains Food Web

Level	Species
Producers	Prairie grasses
Primary Consumers	Grasshoppers
Secondary Consumers	Wasps, spiders
Tertiary Consumers	Birds, snakes

Central Till Plains Food Web

Level	Species
Producers	Crops
Primary Consumers	Aphids, beetles
Secondary Consumers	Lady beetles, lacewings
Tertiary Consumers	Birds, bats

Sources

EPA Food‑Web Studies. Ohio Biodiversity Conservation Partnership. The Nature Conservancy – Ohio Chapter.

Conservation Challenges and Management

Ohio’s insects face numerous threats, including habitat loss, pesticide exposure, invasive species, climate change, and declines in native plant communities. Pollinators such as the Rusty Patched Bumble Bee and Monarch Butterfly have experienced significant population declines. Wetland insects are threatened by drainage and pollution, while forest insects face fragmentation and invasive predators such as the Emerald Ash Borer.

Conservation strategies include pollinator‑friendly planting, reduction of pesticide use, wetland restoration, prairie management, and long‑term monitoring programs. Public education and citizen science initiatives, such as butterfly counts and dragonfly surveys, play an increasingly important role in documenting insect trends.

Sources

Xerces Society for Invertebrate Conservation. USFWS Pollinator Conservation. Ohio State University Extension Entomology. ODNR Wildlife Diversity Reports.