11/20/25, 1:45 PM Minnesota Pesticide Applicators Certification Class C Insect Identification
Minnesota Pesticide Applicators Certification Class C
Insect Identification with Verified Answers.
Yellowish or Reddish Brown. Hard
Shelled, and wire-like. Attack
Wireworm
Seed or drill into base of
stem below ground. Kills
meristematic tissue.
Problem in high organic content fields.
Likely with Manure. White
Seedcorn Maggots
legless maggot tapered
toward head.
C shaped, white, brown
head. One inch long. Chew
White Grubs
on roots and root hairs.
Small Grubs 1/8 to 1/6
inches long. Comma
Grape Colaspis
shaped. Plump white body
with tan head capsule.
Vary in color from light-gray to
black. Are 1 1/2 inches fully
Black Cutworms
grown. Have somewhat
greasy apperance.
Yellowish-tan. Three distinct
stripes on back in black. 1/4
Western Corn Rootworm
inches long. Major corn pest
in the United States.
No distinct markings. Newly
emerged are cream/tan in
Northern Corn Rootworm
color. turn green with age. 1/4
inches long.
Considered minor pest in the midwest.
Southern Corn Rootworm
Small, blue green, soft bodied
insects. Infestations originate
Corn Leaf Aphid
from winged aphids carried
in in June.
, 11/20/25, 1:45 PM Minnesota Pesticide Applicators Certification Class C Insect Identification
Cream to Flesh colored with
small raised dark spots and a
European Corn Borer
dark brown
head. 3/4 to 1 inch long.
Former major pest.
Yellowish Brown head and
longitudinal white and purplish
Stalk Borer
brown stripes. Has a dark
"Saddle" in the middle of the
body that fades with age.
As larva, color changes from dark
brown to light tan, with
Western Bean Cutworm
brown hatch markings on
the back that develop with
age. Major US corn pest.
1/4 inch long. Background
color may be yellow, green,
Bean Leaf Beetle tan, or red. most
wing covers have four black
spots and stripes along the
edges. Always a
black triangle at base of wing covers.
Small yellow aphids with
distinct black cornicles on
Soybean Aphid
rear dorsal abdomen.
Tiny mites with four pairs
of legs. Range in color
Spider Mites
from pale yellow to brown.
Minnesota Pesticide Applicators Certification Class C
Insect Identification with Verified Answers.
Yellowish or Reddish Brown. Hard
Shelled, and wire-like. Attack
Wireworm
Seed or drill into base of
stem below ground. Kills
meristematic tissue.
Problem in high organic content fields.
Likely with Manure. White
Seedcorn Maggots
legless maggot tapered
toward head.
C shaped, white, brown
head. One inch long. Chew
White Grubs
on roots and root hairs.
Small Grubs 1/8 to 1/6
inches long. Comma
Grape Colaspis
shaped. Plump white body
with tan head capsule.
Vary in color from light-gray to
black. Are 1 1/2 inches fully
Black Cutworms
grown. Have somewhat
greasy apperance.
Yellowish-tan. Three distinct
stripes on back in black. 1/4
Western Corn Rootworm
inches long. Major corn pest
in the United States.
No distinct markings. Newly
emerged are cream/tan in
Northern Corn Rootworm
color. turn green with age. 1/4
inches long.
Considered minor pest in the midwest.
Southern Corn Rootworm
Small, blue green, soft bodied
insects. Infestations originate
Corn Leaf Aphid
from winged aphids carried
in in June.
, 11/20/25, 1:45 PM Minnesota Pesticide Applicators Certification Class C Insect Identification
Cream to Flesh colored with
small raised dark spots and a
European Corn Borer
dark brown
head. 3/4 to 1 inch long.
Former major pest.
Yellowish Brown head and
longitudinal white and purplish
Stalk Borer
brown stripes. Has a dark
"Saddle" in the middle of the
body that fades with age.
As larva, color changes from dark
brown to light tan, with
Western Bean Cutworm
brown hatch markings on
the back that develop with
age. Major US corn pest.
1/4 inch long. Background
color may be yellow, green,
Bean Leaf Beetle tan, or red. most
wing covers have four black
spots and stripes along the
edges. Always a
black triangle at base of wing covers.
Small yellow aphids with
distinct black cornicles on
Soybean Aphid
rear dorsal abdomen.
Tiny mites with four pairs
of legs. Range in color
Spider Mites
from pale yellow to brown.
