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1
Minnesota Pesticide Applicators
Certification Class C Insect Identification
QUESTION
Wireworm
Answer:
Yellowish or Reddish Brown. Hard Shelled, and wire-like. Attack Seed or drill into base of stem
below ground. Kills meristematic tissue.
QUESTION
Seedcorn Maggots
Answer:
Problem in high organic content fields. Likely with Manure. White legless maggot tapered
toward head.
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1
QUESTION
White Grubs
Answer:
C shaped, white, brown head. One inch long. Chew on roots and root hairs.
QUESTION
Grape Colaspis
Answer:
Small Grubs 1/8 to 1/6 inches long. Comma shaped. Plump white body with tan head capsule.
QUESTION
Black Cutworms
Answer:
Vary in color from light-gray to black. Are 1 1/2 inches fully grown. Have somewhat greasy
apperance.
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1
QUESTION
Western Corn Rootworm
Answer:
Yellowish-tan. Three distinct stripes on back in black. 1/4 inches long. Major corn pest in the
United States.
QUESTION
Northern Corn Rootworm
Answer:
No distinct markings. Newly emerged are cream/tan in color. turn green with age. 1/4 inches
long.
QUESTION
Southern Corn Rootworm
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1
Answer:
Considered minor pest in the midwest.
QUESTION
Corn Leaf Aphid
Answer:
Small, blue green, soft bodied insects. Infestations originate from winged aphids carried in in
June.
QUESTION
European Corn Borer
Answer:
Cream to Flesh colored with small raised dark spots and a dark brown head. 3/4 to 1 inch long.
Former major pest.
QUESTION
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1
Minnesota Pesticide Applicators
Certification Class C Insect Identification
QUESTION
Wireworm
Answer:
Yellowish or Reddish Brown. Hard Shelled, and wire-like. Attack Seed or drill into base of stem
below ground. Kills meristematic tissue.
QUESTION
Seedcorn Maggots
Answer:
Problem in high organic content fields. Likely with Manure. White legless maggot tapered
toward head.
U)PIWOPOW{WP+{W}W{WWW?WW>>W?W<:lw1po*(2220_@()#)()#!*#Minnesota
_@()#)()#!*#Minnesota
Page 1 of 346^!&%#&*^!*&#(!B*G
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1
QUESTION
White Grubs
Answer:
C shaped, white, brown head. One inch long. Chew on roots and root hairs.
QUESTION
Grape Colaspis
Answer:
Small Grubs 1/8 to 1/6 inches long. Comma shaped. Plump white body with tan head capsule.
QUESTION
Black Cutworms
Answer:
Vary in color from light-gray to black. Are 1 1/2 inches fully grown. Have somewhat greasy
apperance.
U)PIWOPOW{WP+{W}W{WWW?WW>>W?W<:lw1po*(2220_@()#)()#!*#Minnesota
_@()#)()#!*#Minnesota
Page 2 of 346^!&%#&*^!*&#(!B*G
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1
QUESTION
Western Corn Rootworm
Answer:
Yellowish-tan. Three distinct stripes on back in black. 1/4 inches long. Major corn pest in the
United States.
QUESTION
Northern Corn Rootworm
Answer:
No distinct markings. Newly emerged are cream/tan in color. turn green with age. 1/4 inches
long.
QUESTION
Southern Corn Rootworm
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1
Answer:
Considered minor pest in the midwest.
QUESTION
Corn Leaf Aphid
Answer:
Small, blue green, soft bodied insects. Infestations originate from winged aphids carried in in
June.
QUESTION
European Corn Borer
Answer:
Cream to Flesh colored with small raised dark spots and a dark brown head. 3/4 to 1 inch long.
Former major pest.
QUESTION
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