Agronomy CDE Insect Identification

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Agronomy CDEInsect Identification
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Larva stage
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Alfalfa Weevil
Adult ¼ inch long Brownish-grey with darker
brown band down the back
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Aphid
Adult 1/10 inch long Commonly green black
can be gray, brown, yellow, pink, red, or
lavender. All species have 2 tubes (cornicles)
on back ends of their bodies.
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Armyworm Larva
Mature Larva about 1 ½ inches Dark greenish-brown
to black with pale white, orange dark brown
stripes down length of abdomen. Head capsule
yellowish brown.
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Assassin Bug
Long narrow head short beak (3-segmented)
long slender antenna (4-segmented)
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Bean Leaf Beetle
Multiple Colors Always has a black triangle
behind its neck Usually has 4 quadrangular black
marks on its wing covers.
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Blister Beetle
Long (3/4 to 1 ¼ inch) narrow bodies broad
heads antennae that are about 1/3 the length of
entire body.
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Chinch Bug
Adult 1/5 inch long Black with white wings
folded over its back Slender beak
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Corn Earworm Larva
Vary in color Head tends to be orange or light
brown Usually has a broad dark band laterally
above the spiracles and light yellow to white
band below the spiracles
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Corn Rootworm Larva
Soft white to pale yellow bodies Always have
dark to light brown head Small ¼ to ½ inch long.
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Cricket
Brown or black hard exoskeleton, very long
antennae
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Cutworm Larva
30 to 36 mm long 6.5 mm wide Dull gray or dull
gray brown Series of black trapezoidal markings
on the posterior body segments.
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European Corn Borer Larva
Light brown or pinkish gray with brown to black
head capsule and a yellowish brown thoracic
plate Round dark spots on each body segment.
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Flea Beetle
Somewhat elongate to oval in shape, vary in
color, pattern and size Habit of jumping like
fleas when disturbed.
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Grain Weevil
3 4 mm long Forewings hard leathery, meeting
along mid-line of dorsal surface Biting
mouthparts Well-developed thorax
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Grasshopper
Color from green to brown with some darker
markings Big hind legs 2 pairs of wings with
the hind wings being large Antennae not very
long Conspicuous eyes
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Green Lacewing
Pale green 12 22 mm long Long antennae
Bright golden eyes Large, transparent, pale
green wings Delicate body
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Honeybee
3 body parts head, thorax, abdomen Single pair
of antennae 4 wings back legs have thin sacks
called pollen baskets
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Japanese Beetle
3/8 to ½ inch long metallic green to
greenish-bronze with coppery red wings and small
white tufts on the sides and tip of the abdomen.
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Lady Beetle Larva
About 1 cm long Dark alligator-like body 3
pairs of prominent legs yellow or orange bands
or spots
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Leaf Skeletonizer
Grape Leaf Skeletonizer Black w/yellowish or
orange collar ½ inch long Gum Leaf
Skeletonizer Dull grey-brown Forewings darker
grey markings while the hindwings are paler
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Leafhopper
Many Species of Leafhoppers Range from 2 30 mm
long Pale green to gray or brown Somewhat
wedge-shaped bodies
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Larva stage
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Mexican Bean Beetle
6-7 mm long Oval in outline 8 black spots on
each wing cover Cream-yellow to orange-brown
with a bronze tinge
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Scale
Vary from 1/16 to 1/8 inch long Can be almost
any color secrete a waxy covering over their
bodies, scale lives under this covering.
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Spider Mites
Very Small lt1/60 inch Oval shaped
Yellowish/greenish with 2 dark spots on its back.
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Spittlebug
1/3 inch long Red-eyes Dark brown to black
Wings held roof-like over the back in an inverted
V.
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Spotted Cucumber Beetle/ Southern Corn Rootworm
Beetle
¼ inch long Yellow - green with a black head
12 black spots on its wing covers
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Stinkbug
¼ to ½ inch long Flattened, shield-shaped body
Green, brown, black, some brightly colored Hard
upper covering
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Tobacco/Tomato Hornworm Larva
Can be up to 4 inches long Generally green with
7 diagonal white lines on the sides Horn
located dorsally on the terminal abdominal
segment that is usually red or black.
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Western Corn Rootworm Beetle
1/6 to ¼ inch long Yellow in color with 3 black
stripes running down the length of the wing
covers, males may be black with a narrow yellow
margins yellow tips.
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White Grub
½ inch long C-shaped Thick bodied, creamy-white
with a brown head capsule short legs
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Wireworm
Up to ½ inch long Dark brown to
yellowish-orange stiff-bodied Darker head
Behind head are 3 pairs of legs.
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References

• University of Illinois ipm.uiuc.edu
• Penn State University ento.psu.edu
• Texas A M University vegipm.tamu.edu
• University of Florida creatures.ifas.ufl.edu
• University of Nebraska Lincoln ianrpubs.unl.edu
• Iowa State University ent.iastate.edu
• University of Kentucky ca.uky.edu
• Ohio State University ohioline.osu.edu
• Kansas State University oznet.k-state.edu
• Cornell University nysaes.cornell.edu
• University of California ipm.ucdavis.edu