ILLINOIS FIELD CROP APPLICATORS
TEST EXAM 2025 QUESTIONS AND
ANSWERS
An integrated pest management program is based upon what factors? - ANS various,
economical, environmentally sound, socially acceptable
What is the number of pests that should be controlled to prevent economic damage from
occurring? - ANS Economic threshhold
Number of pests, costs of various treatments, expected yield, and expected grain value are all
factors to determine.... - ANS Economic Injury level
What should be done if scouting detects an important pest, but its numbers do not reach the
economic threshold? - ANS Do not treat, but scout again later.
When scouting, where in the field should you sample? - ANS random
What are the 4 types of control measures used in an IPM? - ANS Cultural, Mechanical,
Biological, Chemical
At what stage in the life-cycle of a Corn rootworm does it prune and tunnel through the roots
causing stalk lodging? - ANS Larvae
At what life-cycle stage does a corn rootworm cause ear damage by feeding on the silks? -
ANS Adult
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, What are the economic thresholds when scouting for corn rootworm beetles in corn? -
ANS When silks are green, 5 or more beetles per plant if silks are clipped within 1/2 inch of
the ear tip.
What are the economic thresholds when scouting for corn rootworm beetles in soy? -
ANS From late July to late august at least 5 beetles per unbaited pherocon AM trap in
soybeans or .75 beetles per plant in non-rotated corn.
What damage does a black cutworm larvae do to corn seedlings? - ANS feed on the leaves
and older larvae cause leaf cutting leading to reduced stands.
What are 3 factors that have the most potential to lead to black cutworm damage? -
ANS Crop debris, winter annaul weeds, late planted
What is the recommended method for managing black cutworms in IL? - ANS rescue
treatments when nessisary
What type of larvae causes whorl damage in 1st generation, stalk tunneling damage in the 2nd
generation with possible ear tunneling and stalk rot? - ANS European corn borer
Damages corn by coating the tassels and silks with honeydew which reduces pollination. -
ANS Leaf Aphid
What insects have white, C-shaped, and about 1 inch long larvea which can be differentiated by
their raster patterns? - ANS Japanese beetle grubs and other white grubs.
They chew on the roots and root hairs of seedlings resulting in irregular emergence, reduced
stands, and stunted or wilted plants. Injured plants may turn purple because they cannot take
up phosphorus. - ANS Japanese beetle grubs
2 Copyright ©2025 BRAINBARTER ALL RIGHTS RESERVED
TEST EXAM 2025 QUESTIONS AND
ANSWERS
An integrated pest management program is based upon what factors? - ANS various,
economical, environmentally sound, socially acceptable
What is the number of pests that should be controlled to prevent economic damage from
occurring? - ANS Economic threshhold
Number of pests, costs of various treatments, expected yield, and expected grain value are all
factors to determine.... - ANS Economic Injury level
What should be done if scouting detects an important pest, but its numbers do not reach the
economic threshold? - ANS Do not treat, but scout again later.
When scouting, where in the field should you sample? - ANS random
What are the 4 types of control measures used in an IPM? - ANS Cultural, Mechanical,
Biological, Chemical
At what stage in the life-cycle of a Corn rootworm does it prune and tunnel through the roots
causing stalk lodging? - ANS Larvae
At what life-cycle stage does a corn rootworm cause ear damage by feeding on the silks? -
ANS Adult
1 Copyright ©2025 BRAINBARTER ALL RIGHTS RESERVED
, What are the economic thresholds when scouting for corn rootworm beetles in corn? -
ANS When silks are green, 5 or more beetles per plant if silks are clipped within 1/2 inch of
the ear tip.
What are the economic thresholds when scouting for corn rootworm beetles in soy? -
ANS From late July to late august at least 5 beetles per unbaited pherocon AM trap in
soybeans or .75 beetles per plant in non-rotated corn.
What damage does a black cutworm larvae do to corn seedlings? - ANS feed on the leaves
and older larvae cause leaf cutting leading to reduced stands.
What are 3 factors that have the most potential to lead to black cutworm damage? -
ANS Crop debris, winter annaul weeds, late planted
What is the recommended method for managing black cutworms in IL? - ANS rescue
treatments when nessisary
What type of larvae causes whorl damage in 1st generation, stalk tunneling damage in the 2nd
generation with possible ear tunneling and stalk rot? - ANS European corn borer
Damages corn by coating the tassels and silks with honeydew which reduces pollination. -
ANS Leaf Aphid
What insects have white, C-shaped, and about 1 inch long larvea which can be differentiated by
their raster patterns? - ANS Japanese beetle grubs and other white grubs.
They chew on the roots and root hairs of seedlings resulting in irregular emergence, reduced
stands, and stunted or wilted plants. Injured plants may turn purple because they cannot take
up phosphorus. - ANS Japanese beetle grubs
2 Copyright ©2025 BRAINBARTER ALL RIGHTS RESERVED
