Native and invasive are geographic and ecological labels, not grasshopper appearances. You cannot reliably determine either status from a green or brown color, a single photograph, a large swarm, or crop damage alone. Identification requires the animal’s location and habitat, life stage, several physical features, and a distribution reference for that region.
Most grasshoppers are not serious crop pests. Agriculture and Agri-Food Canada lists more than 80 species in Canada but says about four are known to cause serious economic crop losses; the others are generally harmless to crops and provide food for birds and other wildlife. Conversely, a native species can become damaging during a local population outbreak. The practical approach is to identify first, measure damage and density, then choose the least harmful response appropriate to your jurisdiction.
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What “native” and “invasive” mean for grasshoppers
Native means a species occurs naturally in the region under discussion. Invasive generally describes a species introduced outside its historical range that spreads and causes ecological, economic, or social harm. The words only have meaning when tied to a place and a documented range.
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“Pest” is a management designation based on damage or risk; it does not prove that a species is invasive. “Invasive” is a provenance and impact question. A native grasshopper may need conservation, while an introduced grasshopper may be harmless in a particular garden. Local authorities are the appropriate source for legal status, reporting rules, and treatment decisions.
How can I tell if a grasshopper is native or invasive?
Use this sequence before assigning a label:
- Record the place. Note country, state or province, nearest town, elevation if known, habitat, and whether the animal was in a crop, pasture, roadside, wetland, forest edge, desert, or braided-river margin. A range map is essential because the same-looking insect can be native in one region and introduced in another.
- Determine the life stage. A nymph is smaller and lacks fully developed wings; an adult has completed wings and a more definitive body shape. Compare the specimen with images of both stages, because markings and proportions change as it grows.
- Photograph several angles. Take clear images from above, the side, and behind if you can do so without handling the insect. Include the whole body, head, hind legs, forewings, and hind wings. A scale such as a ruler in a separate frame helps, but do not move a suspected protected or introduced insect.
- Compare multiple traits. Check body length and proportions, head or face shape, stripes and bands, hind-leg markings, forewing texture, hind-wing color or pattern, and habitat. One feature rarely establishes a species.
- Check a regional guide and distribution map. Australian biosecurity guidance, for example, uses adult and nymph images, maps, size, hind-wing patterns, and combinations of distinguishing features. Its instructions are at How to use this identification guide.
- Ask the competent authority when status matters. Send photographs, date, coordinates or a precise locality, habitat, and a description of abundance to a local extension service, conservation department, museum, or biosecurity agency. Follow its instructions for reporting, collection, or quarantine.
Do not infer origin from color, abundance, flight, singing, or crop damage. Those clues can help narrow a comparison, but none is a universal test for invasiveness.
How do I identify a grasshopper from a photo?
Start with life stage, not color
Nymphs resemble adults but are smaller and wingless or have only developing wing pads. Their final adult markings may not yet be visible. A guide that shows only adults can lead to a false match, so use a source that covers both stages. The Australian Department of Agriculture, Fisheries and Forestry (DAFF) specifically provides adult and nymph comparisons.
Use a combination of markings
Look for a consistent set of characters:
- Overall size and whether the body is slender, heavy, short, or unusually long.
- Head profile, face angle, and any stripe running over the head or along the body.
- Color and width of stripes on the thorax and abdomen.
- Lines or bands on the hind legs.
- Forewing texture, spots, or transparency.
- Hind-wing color and banding when the insect opens or flies.
- Habitat and host vegetation.
Color is especially unreliable. DAFF notes that Australian plague locust adults and nymphs may be green or brown, so a photograph’s dominant color is not diagnostic. Lighting, age, weathering, and background can change the apparent shade as well.
Regional examples from Alberta
Government of Alberta guidance illustrates why several traits are more useful than a color impression. Its two-striped grasshopper has conspicuous long body stripes and a stripe on the hind leg. The clear-winged grasshopper has splotchy wings and lacks a head stripe. These are Alberta examples, not rules that can be transferred to every continent. Alberta’s overview is available at Grasshoppers – Overview.
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Behavior can add context. Alberta describes brightly colored band-winged grasshoppers and singing or slant-faced forms as non-pest groups in its local agricultural context. That does not prove native origin, and behavior varies with region, temperature, sex, and life stage.
What a useful photo submission contains
- Unedited original images rather than screenshots or heavily filtered pictures.
- At least one image showing the whole insect and one showing the head and hind legs.
- Date, exact or approximate location, habitat, and whether it was alone or in a concentration.
- A note about observed damage: plant species affected, clipped leaves or stems, and the area involved.
- Whether the insect was an adult or nymph, if you can tell.
If you suspect a new introduction or a protected species, photograph it in place, avoid killing or moving it, and contact the relevant authority for instructions.
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Native, invasive, and pest are different questions
| Question | What it asks | Evidence needed |
|---|---|---|
| Is it native? | Does the species occur naturally in this geographic area? | Regional distribution, taxonomic identification, and provenance records |
| Is it invasive? | Was it introduced outside its historical range, and is it causing or likely to cause harm? | Documented introduction or non-native range plus ecological, economic, or social impact |
| Is it a pest? | Is its current density or feeding causing unacceptable damage? | Species identity, density, life stage, crop or habitat damage, timing, and economic threshold |
| Is it protected or conservation-significant? | Does it receive legal or management protection in this jurisdiction? | Local conservation list, habitat designation, and current authority guidance |
These categories can overlap, but they are not interchangeable. A native species may be a pest in one season and a valuable food source in another. An introduced species may be present without meeting the local definition of invasive.
Are native grasshoppers pests?
Usually, no. Most species in the cited regional guides are not classified as serious crop pests. Agriculture and Agri-Food Canada reports more than 80 Canadian species and about four known to cause serious economic crop losses. The rest are generally harmless to crops and support birds and other wildlife. The figures come from a page modified January 20, 2020, and should not be treated as a new 2026 survey.
Alberta reports more than 85 species and says five are usually considered pest species in that province. The different totals and pest counts reflect different geographic boundaries and definitions; they cannot be combined into a global percentage.
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A native population can nevertheless become damaging when numbers rise sharply. APHIS evaluates density, pest species, life stage, timing, drought and other ecological factors before deciding whether a western rangeland treatment is justified. Seeing grasshoppers is not, by itself, evidence of an outbreak or a need to spray.
A Canada-oriented seasonal heuristic
In a Canadian crop-identification guide, University of Lethbridge professor and author Dr. Dan Johnson is quoted: “Any grasshopper flying before June, singing, having bright coloured wings, and not causing chewing damage is not a pest”. The statement is a Canada-oriented field heuristic, not a test for native versus invasive status. Seasons, behavior, and pest species differ elsewhere, so identify the insect and assess damage before acting.
How to decide whether control is justified
Control should follow a documented risk, not an emotional reaction to an unfamiliar insect. Work through these checks:
- Confirm the identification or at least the pest group. If the species is uncertain, seek an expert determination before applying an insecticide.
- Measure density. Count insects in repeatable sample areas or along fixed transects. Record life stage and whether numbers are increasing.
- Measure actual damage. Identify the plants being eaten, estimate affected area, and distinguish chewing from drought, disease, grazing, or mechanical injury.
- Consider timing. Nymphs, newly emerged adults, and egg-laying adults can have different management implications. A late-season sighting may not justify treatment if no economically meaningful damage is occurring.
- Check natural enemies. Birds, predatory insects, spiders, pathogens, and parasitoids suppress grasshopper populations. Broad treatment can remove those controls and create a larger problem later.
- Ask whether the habitat is sensitive. A protected reserve, rare plant community, waterway, or known habitat for an endemic species requires conservation advice rather than routine crop-pest treatment.
Government of Alberta guidance emphasizes that control may be unnecessary without economically meaningful damage and that natural enemies are important population controls. It also warns that control measures can harm those non-target organisms.
How to protect native grasshoppers and their habitat
Protect the habitat before trying to remove insects
Native grasshoppers depend on particular vegetation structure, bare ground, soil, moisture, and shelter. Avoid unnecessary mowing, grading, burning, soil disturbance, or vegetation changes in sites identified as habitat. Keep vehicles and livestock on designated routes where a conservation authority recommends it, and do not collect insects from protected areas.
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Use targeted, proportionate management
If a verified pest outbreak threatens a crop or rangeland, use the narrowest effective intervention allowed by local regulations. Follow the product label, buffer requirements, weather restrictions, pollinator precautions, and re-entry instructions. Home gardeners should obtain local extension advice rather than copy a rangeland program or apply a product based only on an internet photograph.
Preserve natural enemies
Leave untreated refuges where practical, avoid blanket applications, and protect flowering plants and undisturbed margins that support predators and parasitoids. Recheck the population after intervention instead of assuming that killing visible adults solved the cause.
Report suspected introductions responsibly
Do not release, transport, or intentionally breed an unfamiliar grasshopper. Keep photographs and location data, and use the reporting channel specified by your national or regional biosecurity agency. Authorities may need a live specimen, but only collect or submit one when they direct you to do so.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is the reduced-area approach used on western U.S. rangelands?
APHIS describes Reduced Agent and Area Treatments (RAATs) as its preferred program approach in suitable western U.S. rangeland situations. The method treats less land overall with lower insecticide rates and volumes, alternating treated strips with skipped swaths that often cover at least half the area. Untreated sections help conserve predators, parasites, and other non-target insects.
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Case study: protecting New Zealand’s robust grasshopper
New Zealand’s robust grasshopper, Brachaspis robustus, shows why “native” does not mean “common” or “safe to remove.” The Department of Conservation (DOC) classifies it as nationally endangered. It occurs only along braided-river margins in the Mackenzie Basin, in stony and bouldery habitat.
DOC’s current species page estimates only 250–1,000 mature adults. This is a current estimate presented on the page accessed in 2026, not a census with a stated survey year. The species faces habitat loss, a warming climate, and predation. Vegetation that shades or covers bare ground reduces the open, rocky habitat it needs. Introduced mammalian predators, including hedgehogs and stoats, also prey on it. Details are available from DOC’s Robust grasshopper conservation page.
DOC reports annual monitoring and distribution surveys, predator control, and an insect-exclusion fence installed in 2018 around a small habitat area. Its public advice includes not feeding hedgehogs and participating in a local predator-control program. Those actions apply to the Mackenzie Basin conservation context; they are not universal grasshopper-control instructions.
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| Region and authority | What the source establishes | How to use the information |
|---|---|---|
| Canada — Agriculture and Agri-Food Canada | More than 80 species; about four known to cause serious economic crop losses. Figures are from a page modified January 20, 2020. | Most species are not serious crop pests; identify before spraying. |
| Alberta — Government of Alberta | More than 85 species; five usually considered pest species. Page accessed in 2026. | Use Alberta’s markings and local pest guidance only for Alberta comparisons. |
| Western United States — USDA APHIS | Nearly 400 species across 17 western states; 12 considered pests in the APHIS program. Page last modified September 25, 2026. | Native rangeland species can reach damaging outbreak densities, especially during drought. |
| New Zealand — Department of Conservation | Robust grasshopper is nationally endangered, restricted to Mackenzie Basin braided-river margins, with an estimated 250–1,000 mature adults. | Protect open rocky habitat and follow local predator-control advice. |
| Australia — Department of Agriculture, Fisheries and Forestry | Identification guidance combines adult and nymph images, maps, size, hind-wing patterns, and other features. | Do not identify an Australian locust or grasshopper by color alone. |
These figures describe different regions, dates, and definitions. They are not a worldwide inventory and do not support a universal invasive-grasshopper list.
Choosing an identification guide
A useful field guide should include more than colorful adult photographs. Look for:
- Adult and nymph images.
- Distribution maps for your jurisdiction.
- Measurements or size ranges.
- Head, leg, forewing, and hind-wing characters.
- Habitat and host-plant notes.
- Monitoring and damage-assessment instructions.
Agriculture and Agri-Food Canada describes its Grasshopper Identification and Control Methods booklet as containing more than 60 color images across life stages, with identification, monitoring, and control guidance. The second edition was published in spring 2008; verify the current official publication page and edition before relying on a printed copy. The government factsheet is at A Systems Approach for Sustainable Grasshopper Management.
A practical field checklist
- Where exactly was it found?
- What habitat and plants surrounded it?
- Was it a nymph or an adult?
- What are its body proportions and approximate size?
- Which head, stripe, leg, forewing, and hind-wing markings are visible?
- Is the observed color consistent across several individuals?
- What does the local range map show?
- How many insects are present per sampled area?
- What measurable damage is occurring, and to which plants?
- Could the site contain a protected species or sensitive habitat?
- What does the local extension, conservation, or biosecurity authority recommend?
Bottom line for identification and protection
There is no universal visual shortcut separating native from invasive grasshoppers. Treat origin, pest status, and conservation status as separate determinations. Photograph and document the insect, identify it with a region-specific guide that covers its life stage, verify its distribution, and measure real damage before taking action. Protect habitat and natural enemies, and leave chemical or landscape-scale control to qualified local programs. This approach avoids killing harmless wildlife, reduces collateral damage, and gives genuinely threatened native species a better chance of surviving.
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