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  • Harmful Insects Listing

    Harmful Insects Listing

    While there are many helpful insects encountered throughout the world, there are also plenty of harmful species that pass disease, destroy crops, affect animal populations and the like.

    There are a total of (37) Harmful Insects in the Insect Identification database. Entries are listed below in alphabetical order. Insects that we we consider to be harmful are those that accomplish something negative for the ecosystem - destroying crops, structures, infestations, delivering painful / poisonous / venomous bites, etc... Keep in mind that some insects deemed "harmful" appearing on this list may also provide benefits. The insect world is one of many moving parts that include both helpful and harmful species - with every bug playing its own role in some way.

    NOTE: Always seek professional medical care if you suspect yourself to have been bitten, stung, etc...in any way by an insect. Only a trained medical professional can truly assess your particular condition and injury.

    Thumbnail picture of the American Oil Blister Beetle
    American Oil Beetle
    Why Harmful?: Secretes a chemical that can irritate human skin, causing blisters.
    Thumbnail picture of the Aphid insect

    Why Harmful?: Devastating to plants, particularly when congregating in number, as they suck on the juice needed to sustain them; their resulting secretions can also attract other garden pests like ants.
    Thumbnail picture of the Black and Yellow Garden Spider
    Asian Multicolored Lady Beetle

    Why Harmful?: This foreign species is growing in such numbers that it is replacing native North American ladybug types.
    Thumbnail picture of the Assassin Bug

    Assassin Bug

    Why Harmful?: Can delivery very painful, repeat bites with its powerful "beak".
    Thumbnail picture of the Bald-Faced Hornet

    Bald-Faced Hornet

    Why Harmful?: Aggressive species that will sting repeatedly.
    Thumbnail picture of the Bed Bug
    Bed Bug

    Why Harmful?: Ruthless biter of humans and animals alike, causing skin irritations to occur in the former; can also heavily infest human living spaces, live over a year without food, and even travel far to seek out food.
    Thumbnail picture of the Black Carpenter Ant
    Black Carpenter Ant

    Why Harmful?: Burrow into wood causing tremendous damage to occur; colonies can number beyond 10,000 while queens produce eggs quickly; attracted to food scraps, plant juices, fungus and the like.
    Thumbnail picture of the Black Vine Weevil

    Black Vine Weevil

    Why Harmful?: Plant-eaters known to destroy gardens.
    Thumbnail picture of the Black Widow Spider

    Black Widow Spider

    Why Harmful?: Females carry a highly-toxic venom delivered through bite.
    Thumbnail picture of the Black-Legged Tick

    Black-Legged Tick

    Why Harmful?: Known carrier of Lyme Disease.
    Thumbnail picture of the Blister Beetle

    Blister Beetle

    Why Harmful?: Secretes chemical toxin that irritates human skin.
    Thumbnail picture of the Boll Weevil

    Boll Weevil

    Why Harmful?: Destroyer of cotton crops.
    Thumbnail picture of the Brown Marmorated Stink Bug

    Brown Marmorated Stink Bug

    Why Harmful?: Damages fruit stocks, making the fruit less likely to see market; produces a "stink" when disturbed or threatened.
    Thumbnail picture of the Buffalo Treehopper

    Buffalo Treehopper

    Why Harmful?: Their appetite can affect crops and gardens.
    Thumbnail picture of the Carolina Locust

    Carolina Locust

    Why Harmful?: While the least destructive of the U.S. locusts their appetite and numbers still damage plants and crops.
    Thumbnail picture of the Cottonwood Borer Beetle

    Cottonwood Borer Long-Horned Beetle

    Why Harmful?: Destructive to trees like poplar, willow and cottonwood.
    Thumbnail picture of the Cow Killer

    Cow Killer

    Why Harmful?: This ant-looking wasp-kin has a ferocious sting that is very painful.
    Thumbnail picture of the Differential Grasshopper
    Differential Grasshopper

    Why Harmful?: Feeds on various crops, damaging or destroying harvests.
    Thumbnail picture of the Dogbane Leaf Beetle

    Dogbane Leaf Beetle

    Why Harmful?: Larvae feed on the roots of the Dogbane Plant.
    Thumbnail picture of the Emerald Ash Borer

    Emerald Ash Borer Beetle

    Why Harmful?: Destructive tree-boring beetle.
    Thumbnail picture of the Giant Whipscorpion

    Giant Whipscorpion

    Why Harmful?: Its defensive secretion can cause nausea and skin irritations to humans.
    Thumbnail picture of the Gray Hairstreak Butterfly

    Gray Hairstreak Butterfly

    Why Harmful?: Pesky caterpillar feeds on the flowers of legumes.
    Thumbnail picture of the Kudzu bug

    Kudzu Bug

    Why Harmful?: Invasive plant-eating species.
    Thumbnail picture of the Megetra cancellata blister beetle
    Megetra Cancellata Blister Beetle

    Why Harmful?: Secretes a caustic chemical that irritates human skin, causing blisters to appear.
    Thumbnail picture of the Mutillid Wasp

    Mutillid Wasp

    Why Harmful?: This ant-looking wasp kin can deliver one of the most painful stings known to humans.
    Thumbnail picture of the Red Pavement Ant

    Red Pavement Ant

    Why Harmful?: Hunters and consumers of all manner of human food; can overtake sidewalks, driveways and the like through sheer numbers and deliver pinching bites when bothered.
    Thumbnail picture of the Red Velvet Ant

    Red Velvet Ant

    Why Harmful?: Another ant-looking wasp kin, this bug can deliver a very painful sting; larvae destroy other insect larvae nests.
    Thumbnail picture of the Red-Legged Grasshopper

    Red-Legged Grasshopper

    Why Harmful?: Can decimate human food crops; penchant for soybean, alfalfa, wheat, barley and grain crops; can transfer parasites to bird hosts when eaten as prey.
    Thumbnail picture of the Rose Chafer Beetle

    Rose Chafer Beetle

    Why Harmful?: Both larvae and adults prey on plants.
    Thumbnail picture of the Spotted Cucumber Beetle

    Spotted Cucumber Beetle

    Why Harmful?: Destructive pest for vegetables.
    Thumbnail picture of the Spotted Tree Borer Beetle

    Spotted Tree Borer Beetle

    Why Harmful?: Larvae destroy trees from the inside out.
    Thumbnail picture of the Spur-Throated Grasshopper

    Spur-Throated Grasshopper

    Why Harmful?: Larvae destroy trees from the inside out.
    Thumbnail picture of the Three-Lined Potato Beetle

    Three-Lined Potato Beetle

    Why Harmful?: Their broad menus concerning plants makes them true pests to humans.
    Thumbnail picture of the North American Tick


    Why Harmful?: All manner of warm-blooded creatures - including humans - are fair game as hosts for the Tick.
    Thumbnail picture of the Tobacco Hornworm Moth

    Tobacco Hornworm Moth

    Why Harmful?: Its diet goes beyond the tobacco plant - it includes potato and tomato plants as well.
    Thumbnail picture of the Western Conifer Seed bug

    Western Conifer Seed bug

    Why Harmful?: Seeds of evergreen trees make up this pest's primary diet.
    Thumbnail picture of the White Oak Borer Beetle

    White Oak Borer Beetle

    Why Harmful?: Its preference for White Oak trees can make this Long-Horned Beetle a true pest.

    BUGFINDER: What Kind of Bug is This...
    BUGFINDER allows for a quick search of the Insect Identification database by selecting primary color, secondary color, number of legs and the territory / state in question. If only one color is present on your insect, select it again as its SECONDARY color. Remember that the more details you can offer, the better your chances of finding a match. As a rule of thumb, six legs are typical for most insects whereas spiders generally have eight legs.
    Primary Color:
    Secondary Color:
    Number of Legs:
    State / Province:
    General Category: