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Native and invasive are geographic labels, not grasshopper appearances. A grasshopper is native when it naturally occurs in a particular region; it is invasive only when a non-native organism establishes there and causes ecological, economic or social harm. A native species can become an agricultural pest during a population outbreak, while an introduced species may be harmless or not yet established. Color, a single photograph, abundance or crop damage cannot establish origin by themselves.
Reliable identification combines the exact location and habitat with life stage, body shape, markings, wing patterns, distribution maps and observed impact. The regional examples below cover Canada, the western United States, Alberta, Australia and New Zealand; they are not a worldwide invasive-grasshopper checklist. When legal status, a suspected introduction or a protected species is involved, use your local extension, conservation or biosecurity authority.
What “native,” “invasive” and “pest” mean
Native describes a species that occurs naturally in the region under consideration. The same species can be native in one country and introduced in another. Invasive generally describes a non-native species that establishes and causes significant harm; simply finding an unfamiliar insect does not prove invasiveness. A local authority’s distribution records and risk assessment are needed.
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These labels answer different questions:
| Question | Evidence needed | What it does not prove |
|---|---|---|
| Is it native here? | A verified range or provenance record for the specific region | Color, abundance or whether it eats a crop |
| Is it invasive here? | Evidence of non-native origin, establishment and harmful impact under local criteria | That the species is simply uncommon, large or unfamiliar |
| Is it a pest? | Observed density, life stage, damage and the local economic or ecological threshold | That it is non-native |
How can I tell if a grasshopper is native or invasive?
Start with geography, then identify the insect. A species guide for your state, province, country or island is more useful than a global photograph search. Record the exact place, habitat, date and whether the insect was in a crop, pasture, roadside, wetland, desert or braided-river margin. Distribution is part of the identification, not an optional final check.
1. Establish the life stage
Nymphs are smaller and usually lack fully developed wings; adults have the final body size and wing form. Nymph colors and markings can differ from adult markings, and several species look alike at one stage but not the other. The Australian Department of Agriculture, Fisheries and Forestry’s guide deliberately provides adult and nymph images because comparing the wrong stage can produce a false match. Alberta also notes that nymphs resemble adults but are smaller and wingless. See the Australian identification guide’s instructions.
2. Compare several physical traits
Use a combination rather than one “tell.” Check body length and proportions, the shape of the head and face, stripes or bands on the body, hind-leg markings, forewing texture, hind-wing color and pattern, and the presence or absence of a head stripe. Habitat and behavior can narrow the choices, but they do not establish origin.
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Regional examples from Alberta illustrate why combinations matter. The two-striped grasshopper has long body stripes and a stripe on the hind leg, while the clear-winged grasshopper has splotchy wings and lacks a head stripe. Those are Alberta comparison points, not universal rules for every continent or species.
3. Treat color as supporting evidence only
Color can vary within a species and between life stages. The Australian guide warns that Australian plague locust adults and nymphs may be green or brown, so a single photograph’s color is not diagnostic. A brown individual is not automatically invasive, and a brightly colored one is not automatically native or harmless.
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4. Check distribution and habitat
Once you have a likely species, compare its documented range with your observation. A range map that includes your county or watershed supports an identification; it does not by itself prove that every individual there is native. Conversely, an observation outside the published range deserves confirmation, especially near ports, nurseries, transport corridors or recently disturbed land.
5. Use behavior carefully
Singing, flight style and wing displays can help separate look-alikes in a local guide. Alberta describes brightly colored band-winged grasshoppers and singing or slant-faced forms as non-pest groups in its agricultural context. That observation cannot be generalized to another region, and behavior cannot prove whether an insect arrived naturally or through human transport.
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A photo is a starting record, not a verdict. Take several images before the insect moves, and preserve the context that a cropped close-up removes.
- Photograph in place. Take a full scene showing habitat, a top view, a side view, the head and antennae, the folded forewings, the hind legs and—if it opens its wings—the hind-wing pattern. Include a scale such as a ruler only when doing so does not disturb a protected insect.
- Record metadata. Note the date, precise locality or coordinates, elevation if relevant, host plant, habitat type, weather and whether you saw one insect or a concentration.
- Determine stage. Look for wing pads or fully formed wings and estimate size. Do not compare a nymph image with an adult identification plate.
- Make a regional shortlist. Use an official state, provincial, national or territory guide. Compare multiple traits and distribution maps, not just the closest-looking thumbnail.
- Assess impact separately. Estimate density and document actual chewing or defoliation. A large number of grasshoppers without meaningful damage is not proof of a pest outbreak.
- Request confirmation when status matters. Send the photographs, location, date and habitat notes to the relevant extension, conservation or biosecurity office. Keep the original files so image details and metadata are available.
If you suspect an introduction or a protected species, photograph it where it is, avoid killing or moving it, and follow the receiving authority’s instructions. Reporting channels and legal handling rules differ by jurisdiction.
What regional evidence says about grasshopper diversity and pest status
The figures below come from different agencies, boundaries and definitions. They should not be combined into a global percentage.
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| Region and source | Species or program figure | How to interpret it |
|---|---|---|
| Canada — Agriculture and Agri-Food Canada, page modified January 20, 2020 | More than 80 species; about four known to cause serious economic crop losses | Most Canadian grasshoppers are not serious crop pests and provide food for birds and other wildlife. The figures are from the cited 2020 page, not a 2026 survey. |
| Western United States — USDA APHIS, page last modified September 25, 2026 | Nearly 400 species across 17 western states; 12 considered pests in the APHIS program | APHIS describes these rangeland grasshoppers as natural to the region. “Pest” identifies a management concern, not an invasive origin. |
| Alberta — Government of Alberta, accessed October 13, 2026 | More than 85 species; five usually considered pest species | Local agricultural guidance distinguishes pest species from many harmless species and emphasizes natural controls. |
| Australia — Department of Agriculture, Fisheries and Forestry | Guide uses adult and nymph images, distribution maps and wing-pattern comparisons | The guide demonstrates why stage, range and several markings are needed; green-versus-brown color alone is unreliable. |
| New Zealand — Department of Conservation, current page accessed October 13, 2026 | Robust grasshopper (Brachaspis robustus): an estimated 250–1,000 mature adults | This is a nationally endangered endemic restricted to a particular Mackenzie Basin habitat, not a representative count for all New Zealand grasshoppers. |
For a Canadian field reference, Agriculture and Agri-Food Canada describes the Grasshopper Identification and Control Methods booklet by Dr. Dan Johnson. Its second edition was published in spring 2008 and contains more than 60 color images covering life stages, identification, monitoring and control. The government factsheet and publication link are at Agriculture and Agri-Food Canada’s sustainable grasshopper management page.
Are native grasshoppers pests?
Yes, a native species can be a pest when its population exceeds the local damage threshold. Drought, warm conditions, abundant breeding habitat and reduced natural mortality can allow densities to rise rapidly. In that situation, the management question is not “Is it native?” but “Which species and life stage are present, how dense are they, what damage is occurring, and what response causes the least collateral harm?”
USDA APHIS evaluates those factors in western rangelands. Its program notes that outbreak effects can be severe, particularly during drought, even though the grasshoppers are natural parts of the rangeland fauna. Alberta likewise cautions that treatment may be unnecessary without economically meaningful damage. Natural enemies help regulate populations, and broad control can harm those predators and parasites.
A Canada-oriented crop-guide heuristic illustrates the distinction. Dr. Dan Johnson is quoted by Agriculture and Agri-Food Canada as saying: “Any grasshopper flying before June, singing, having bright coloured wings, and not causing chewing damage is not a pest”. The page presents this as a regional identification and crop-management aid, not as a universal test for native versus invasive status. Species, seasons and behavior differ outside that context, and the same guidance directs readers to identify the species before spraying.
How to decide whether control is justified
For a garden or small property
- Confirm the species and life stage before applying any product.
- Inspect plants for fresh chewing, clipped leaves and declining growth; count insects in a consistent area rather than reacting to a single sighting.
- Use physical exclusion, hand removal or targeted cultural measures where practical, especially when damage is light.
- Preserve flowering plants and untreated refuge so birds, spiders and predatory insects can continue to feed.
- Ask a local extension office about thresholds and products approved for your crop and jurisdiction. A label, local law and pollinator precautions take priority over generic internet advice.
For farms and rangelands
Scouting should identify species, density, life stage, egg-hatch timing, host plants, weather and the area actually at risk. Treating every grasshopper sighting wastes money and can remove natural enemies. Compare the expected value of protected forage or crop yield with treatment cost and non-target risk.
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USDA APHIS describes a program-specific approach called Reduced Agent and Area Treatments (RAATs). It treats less land at lower insecticide rates and volumes, alternating treated strips with skipped swaths that often cover at least half the area. Untreated strips conserve predators, parasites and other non-target insects. RAATs are an APHIS rangeland program, not a universal homeowner pesticide prescription; any use must follow local authorization, product labels and applicator requirements. Program details are available from USDA APHIS’s Rangeland Grasshopper and Mormon Cricket page.
Protecting a native species is different from suppressing an outbreak
Conservation begins by protecting the habitat that the species needs, not by removing every grasshopper. Avoid mowing, grading, cultivation or chemical treatment in occupied habitat until the responsible authority has assessed the site. Maintain the natural plant structure and bare-ground features identified by local experts, and prevent disturbance during the species’ sensitive life stages.
New Zealand case study: the robust grasshopper
New Zealand’s Department of Conservation identifies the endemic robust grasshopper, Brachaspis robustus, as nationally endangered. It occurs only along braided-river margins in the Mackenzie Basin, in stony and bouldery habitat. DOC’s current estimate is 250–1,000 mature adults. Habitat loss, a warming climate and predation threaten the population; vegetation that shades or covers bare ground can reduce suitable habitat, while introduced mammals such as hedgehogs and stoats prey on the grasshoppers.
DOC reports annual monitoring and distribution surveys, predator control and an insect-exclusion fence installed in 2018 around a small habitat area. In that local context, public actions include not feeding hedgehogs and joining a local predator-control program. These measures are specific to the Mackenzie Basin conservation effort, not a general prescription for every native grasshopper. Details are on DOC’s robust grasshopper conservation page.
Practical protection checklist
- Identify before intervening: save clear photographs and obtain a regional confirmation when status is uncertain.
- Protect known habitat: keep vehicles, earthworks, mowing and grazing out of sensitive sites unless an approved plan allows them.
- Use the least disruptive response: choose monitoring or physical measures when damage is below the local threshold.
- Protect natural enemies: retain untreated refuge and avoid broad-spectrum applications that eliminate predators, parasites or pollinators.
- Report unusual findings: contact the local biosecurity or conservation authority if the insect is outside its known range, associated with imported material or potentially protected.
- Follow local rules: pesticide labels, protected-species laws, collection permits and reporting systems vary by country and subnational jurisdiction.
Common identification mistakes
“It is brown, so it must be invasive.”
False. Brown and green forms can occur within the same species, and color changes with age and conditions. Use markings, stage, range and habitat.
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“There are hundreds, so the species must be a pest.”
False. Abundance is one management input. Damage, species composition, weather, life stage and economic thresholds determine whether intervention is warranted.
“It ate my plant, so it is invasive.”
False. Native herbivores also eat crops and garden plants. Document the damage and identify the insect before assigning origin or choosing a treatment.
“A search result from another country confirms the identification.”
Not necessarily. Similar-looking species occupy different continents, and common names are not consistent. A local distribution map and authority are essential.
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Often it is not. Missing the hind wing, head, hind legs, scale, habitat and location can eliminate the traits that separate similar species.
What to send an authority when you need confirmation
Provide the original, unedited images; exact locality; date and time; habitat and host plant; estimated number of insects; life-stage observations; recent weather or disturbance; and any evidence of chewing or crop loss. State whether you moved, collected or treated the insects. This lets an identifier distinguish a routine native observation from a possible range extension, protected-species record or biosecurity concern.
Bottom line for land managers and observers
Do not decide “native,” “invasive” or “pest” from appearance alone. Identify the life stage using several physical traits, verify the species against a regional range and habitat guide, document actual damage and density, and then consult the local authority if intervention or reporting is required. Most grasshoppers in the regional guides cited here are not serious crop pests, while a few native species can cause severe outbreak damage and some native species require active conservation. Correct identification is what separates proportionate management from unnecessary harm.
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