Lubber grasshoppers pose little direct danger to humans but can genuinely sicken pets, particularly dogs that eat them. These large, slow-moving insects are chemically defended with toxic compounds that irritate skin and mucous membranes on contact and cause vomiting, drooling, and gastrointestinal distress when swallowed by animals. The risk to people is mostly a matter of temporary discomfort if you handle one and get sprayed, while the risk to pets depends heavily on how much of the grasshopper they consume and how big the animal is.
What Lubber Grasshoppers Do When Threatened
Lubber grasshoppers are not aggressive toward people or animals. They are slow walkers, poor fliers, and generally want nothing to do with you. But when they feel cornered, they have a surprisingly dramatic set of defenses. When alarmed, lubbers spread their wings to flash bright color patches, hiss audibly by forcing air through their breathing pores (called spiracles), and secrete a foul-smelling froth from those same spiracles. They also regurgitate recently consumed plant material as a dark brown liquid, often called “tobacco spit,” which stains skin and clothing. Beyond these passive-aggressive tactics, lubbers can spray toxic chemicals for a distance of about 15 centimeters, or roughly six inches, from their body.1ResearchGate. Biology and Management of the Eastern Lubber Grasshopper (Orthoptera: Acrididae)
The chemical defense consists of both compounds the grasshopper manufactures internally and compounds it absorbs from the plants it eats. The primary toxins are phenolic compounds, including catechol and hydroquinone.2Journal of Integrated Pest Management. Biology and Management of the Eastern Lubber Grasshopper (Orthoptera: Acrididae) These chemicals are well-known irritants. Catechol can cause contact dermatitis and eye irritation in humans; hydroquinone is used industrially as a skin-lightening agent at low concentrations but is a tissue irritant at higher ones. In the context of a grasshopper spraying you, the concentrations are low enough that serious harm to a healthy adult is extremely unlikely, but the experience is unpleasant.
What Happens If You Handle a Lubber
If you pick up a lubber grasshopper with bare hands, you may get a faceful of hissing, a smear of foul-smelling froth, or a squirt of brown regurgitated plant matter on your fingers. The tobacco spit is messy but harmless beyond staining. The chemical froth is more concerning. It smells terrible, and if it gets in your eyes, it burns. The phenolic compounds in the secretion are topical irritants that cause a stinging or burning sensation on sensitive skin, especially around the eyes, nose, and mouth.
For a typical adult, the worst-case scenario from handling a lubber is temporary skin irritation and a need to wash your hands thoroughly. If the spray reaches your eyes, flush them with water. The irritation usually resolves on its own. There are no documented cases of lubber grasshopper secretions causing lasting injury to humans, and the insects don’t bite hard enough to break skin. Their mandibles are designed for chewing plant material, not for defense against large mammals.
Children deserve a bit more caution, mostly because they are more likely to rub their eyes after handling one and because their skin tends to be more sensitive. But the practical advice is the same: wash the affected area with soap and water, flush eyes if needed, and the discomfort should pass quickly.
Why Pets Face a Greater Risk
The real concern with lubber grasshoppers is not that they’ll spray your dog but that your dog will eat one. Dogs, and to a lesser extent cats, are drawn to the slow, conspicuous movement of lubbers and may snap them up as a crunchy snack. This is where the toxicity becomes a genuine health issue. The phenolic compounds that merely irritate human skin can cause real gastrointestinal distress when an animal swallows a whole grasshopper, gut contents and all.
Dogs that eat lubbers typically vomit within minutes to hours. Profuse drooling, refusal to eat, and lethargy are also commonly reported. In most cases involving a large dog and a single grasshopper, the symptoms are self-limiting: the dog throws up, feels miserable for a while, and recovers. But smaller dogs and cats are at higher risk because they have less body mass to dilute the toxins. A Chihuahua that eats two or three lubbers is dealing with a proportionally much larger dose than a Labrador that eats one.
The severity also depends on the particular grasshopper. As discussed below, lubbers vary considerably in how chemically defended they are based on their age, sex, and diet. A dog that eats a well-fed adult female lubber is ingesting more toxin than one that eats a recently molted juvenile. If your pet eats a lubber and shows prolonged vomiting, diarrhea, or signs of lethargy that don’t resolve within a few hours, a veterinary visit is warranted. There is no specific antidote for lubber toxins; treatment is supportive, focusing on preventing dehydration and managing nausea.
Cats are generally less likely to eat lubbers than dogs, partly because cats tend to be more cautious eaters and partly because the grasshopper’s warning display seems to deter them more effectively. Still, a cat that does eat one can experience the same gastrointestinal symptoms. Reptile and bird keepers should be particularly aware: lubber grasshoppers are highly toxic to many bird species and lizards, and feeding them to pet reptiles or allowing free-ranging poultry to eat them can be fatal. The loggerhead shrike, one of the few wild birds that regularly preys on lubbers, famously impales them on thorns and waits for the toxins to degrade before eating them. Most backyard chickens don’t have that strategy.
Not All Lubbers Are Equally Toxic
One of the more interesting findings about lubber grasshopper chemistry is how much individual toxicity varies. This isn’t a species where every individual carries the same chemical payload. Several factors drive the differences.
Age matters substantially. Lubbers lose their chemical defenses entirely during molts, and the concentration of defensive compounds increases as the grasshopper gets older. Females tend to carry higher concentrations of defensive chemicals than males.2Journal of Integrated Pest Management. Biology and Management of the Eastern Lubber Grasshopper (Orthoptera: Acrididae) A freshly molted young male lubber is a much less chemically defended animal than an old adult female that hasn’t molted recently.
Diet plays an even more dramatic role. Lubbers raised on a varied diet of many plant species produce defensive secretions that contain more compounds at higher concentrations than lubbers fed a restricted diet. In laboratory experiments, grasshoppers raised on a single plant species or an artificial diet had secretions with fewer compounds, lower concentrations, and a markedly different chemical profile compared to those raised on a varied diet of over two dozen plant species.3PubMed. Effects of diet breadth on autogenous chemical defense of a generalist grasshopper The breadth of a lubber’s diet essentially determines how well-armed it is.
Certain plants supercharge the defenses even further. Lubbers that feed on catnip, for instance, produce secretions that are more repellent to predatory ants than those of wild-fed lubbers, even though the internally produced phenolic compounds themselves don’t change in concentration.4Springer Link / Journal of Chemical Ecology. A generalist herbivore in a specialist mode: Metabolic, sequestrative, and defensive consequences The grasshopper absorbs additional defensive chemicals from the plant and adds them to its existing arsenal. This means a lubber living in a weedy, botanically diverse garden is probably more toxic than one living in a monoculture lawn.
What this means practically is that you can’t judge a lubber’s toxicity just by looking at it. Two grasshoppers sitting on the same plant can differ significantly in how dangerous they are to a pet that eats them. The safest assumption is that any adult lubber is toxic enough to make a small animal sick.
The Warning Colors Are Doing Their Job
Lubber grasshoppers are not subtle animals. Adults are typically bright yellow and black, or black with red or orange markings, depending on their stage and geographic variant. This bold coloring is a textbook example of aposematic coloration, which warns potential predators that the animal is toxic or unpleasant to eat.2Journal of Integrated Pest Management. Biology and Management of the Eastern Lubber Grasshopper (Orthoptera: Acrididae) The strategy works: most native predators in the lubber’s range learn quickly to avoid them. Birds that eat one and get sick rarely try again.
Their slow, deliberate movement is part of this defense system too, not a design flaw. Research using frogs as model predators found that slow-moving lubbers survived significantly more encounters than lubbers that had been artificially induced to move quickly. Frogs attacked the fast-moving lubbers sooner and more aggressively, while the slow-movers essentially failed to trigger the frog’s attack response long enough for the frog to notice the warning coloration or smell the chemical defense.5Springer Link / Oecologia. Slow movement increases the survivorship of a chemically defended grasshopper in predatory encounters Being slow isn’t a vulnerability for a lubber; it’s a survival strategy that complements the bright colors and chemical weaponry.
This is worth knowing because it explains why lubbers seem so easy to catch. They are easy to catch. They’re not trying to escape the way a field grasshopper would. Their entire evolutionary approach to predators is “go ahead, try it, you’ll regret it.” For humans, this means you’ll encounter them sitting calmly on your garden plants, walking slowly across your porch, and generally acting like they own the place. That confidence is backed by chemistry.
Where You’ll Encounter Them
Eastern lubber grasshoppers are found across the southeastern and south-central United States, from central North Carolina through Alabama, Mississippi, and Louisiana to Texas, and they are especially common throughout Florida.6Academia.edu. Eastern Lubber Grasshopper, Romalea microptera (Beauvois) (Orthoptera: Acrididae) Florida residents deal with them more than anyone else, particularly during spring and early summer when nymphs hatch in large aggregations and begin moving through gardens, flower beds, and vegetable patches.
The nymphs are worth recognizing because they look quite different from the adults. Juvenile lubbers are typically jet black with one or more bright yellow, orange, or red stripes. They aggregate in groups, sometimes dozens strong, and march in loose formation through vegetation. This is the stage where garden damage is often worst, since large numbers of hungry nymphs can strip ornamental plants quickly. As they mature and molt into adulthood, they become more solitary and develop the yellow-and-black or red-and-black patterns that most people associate with the species.
From a danger standpoint, the nymphs are less chemically defended than adults. They’re smaller, younger, and lose their chemical protection with every molt. A dog that eats a nymph is less likely to get seriously ill than one that eats a full-grown adult, though any lubber ingestion can potentially cause symptoms.
Managing Lubbers Around Pets and Family
If you live in lubber territory and have outdoor pets, the most effective strategy is physical removal. Hand-picking lubbers off plants and dropping them into a bucket of soapy water is the standard recommendation from university extension services across the Southeast. Wear gloves to avoid the spray and the staining tobacco spit. Early morning, when temperatures are cooler and lubbers are less active, is the easiest time to collect them.
For pet safety, the key is limiting your dog’s access to areas with heavy lubber concentrations during peak season. This often means supervising outdoor time more closely in spring and early summer, when nymph aggregations are at their densest. If you spot a cluster of black-and-yellow nymphs on your property, removing them before they disperse reduces the chance your pet encounters one.
Chemical pesticides are generally a poor fit for lubber control for several reasons. Lubbers are large, tough insects that resist many common insecticides at label rates. More concerning from a pet-safety perspective, using broad-spectrum pesticides in areas where your dog roams introduces its own set of risks. A poisoned lubber that is still alive but sluggish becomes an even easier target for a curious dog, and now the dog is ingesting both grasshopper toxins and pesticide residue.
Some gardeners use targeted applications of insecticidal bait designed for grasshoppers, applied directly to areas where nymphs are aggregating and away from pet access points. This is a more surgical approach, but it still requires careful placement. For most homeowners, the combination of hand-picking, removing attractive plant hosts near pet areas, and keeping a close eye on dogs during peak lubber season is sufficient.
Plants That Attract Lubbers to Your Yard
Lubbers are generalist feeders, but they have clear preferences. They are particularly fond of amaryllis, crinum lilies, oleander, and various members of the lily family. Vegetable gardens with beans, peas, and leafy greens also draw them in. If you have ornamental plantings near areas where your pets spend time, consider whether those plants are lubber magnets and whether rearranging the garden might create a buffer zone.
The dietary sequestration research mentioned earlier has a practical implication here. Lubbers that feed on a wide variety of plants become more toxic. A botanically diverse garden full of ornamentals, herbs, and vegetables isn’t just attracting lubbers; it’s potentially making them more chemically defended. This doesn’t mean you should rip out your garden, but it’s one more reason to keep lubbers out of it rather than tolerating them: a well-fed lubber in a diverse garden is a more dangerous snack for your dog than a half-starved one in a monoculture lawn.
Some plants are naturally resistant to lubber feeding. Lubbers tend to avoid most grasses, and they dislike many aromatic herbs. Replacing vulnerable ornamentals near dog runs or outdoor play areas with less attractive species can reduce encounters without requiring constant monitoring.
What Lubbers Cannot Do
A fair amount of anxiety about lubber grasshoppers comes from their appearance. They are large, brightly colored, and make alarming hissing sounds. Some people assume they must sting or bite dangerously. They don’t. Lubbers have no stinger, no venom-injecting apparatus, and their mandibles are not strong enough to cause a meaningful bite wound on human skin. The worst a lubber can physically do to you is spray you with bad-smelling chemicals and stain your shirt.
They also don’t carry diseases transmissible to humans or pets. Unlike mosquitoes, ticks, or certain flies, grasshoppers are not vectors for any human or veterinary pathogens. The risk is entirely chemical, not infectious.
Lubbers cannot infest your home in any meaningful way. They are outdoor insects that need plant material to survive. If one wanders inside, it’s lost, not establishing a colony. They don’t breed indoors, they don’t eat wood or fabric, and they have no interest in your food supply. The nuisance they cause is confined to your garden and to the possibility that a pet encounters one outside.
One persistent myth is that lubbers are poisonous to touch and that handling one will make you seriously ill. As covered earlier, the secretions are irritating but not dangerous to an adult with intact skin. You can safely relocate a lubber with gloved hands. The key word is “gloved,” not because the toxin is dangerous to your hands, but because the froth stinks and the tobacco spit stains, and you’ll want to avoid getting either in your eyes by absentmindedly rubbing your face afterward.