Illinois Field Crop Applicators Test Questions and
Answers A+ Graded Latest Update 2025
An integrated pest management program is based upon what factors? ---
correct answer ---various, economical, environmentally sound, socially
acceptable
What is the number of pests that should be controlled to prevent economic
damage from occurring? --- correct answer ---Economic threshhold
Number of pests, costs of various treatments, expected yield, and expected
grain value are all factors to determine.... --- correct answer ---Economic
Injury level
What should be done if scouting detects an important pest, but its numbers
do not reach the economic threshold? --- correct answer ---Do not treat, but
scout again later.
When scouting, where in the field should you sample? --- correct answer ---
random
What are the 4 types of control measures used in an IPM? --- correct answer
---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? --- correct answer ---Larvae
At what life-cycle stage does a corn rootworm cause ear damage by feeding
on the silks? --- correct answer ---Adult
What are the economic thresholds when scouting for corn rootworm beetles
in corn? --- correct answer ---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? --- correct answer ---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? --- correct
answer ---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? --- correct answer ---Crop debris, winter annaul weeds, late
planted
, What is the recommended method for managing black cutworms in IL? ---
correct answer ---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? ---
correct answer ---European corn borer
Damages corn by coating the tassels and silks with honeydew which reduces
pollination. --- correct answer ---Leaf Aphid
What insects have white, C-shaped, and about 1 inch long larvea which can
be differentiated by their raster patterns? --- correct answer ---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. --- correct
answer ---Japanese beetle grubs
They are metallic looking green beetles that are 3/8 to 1/2 and inch long
with coppery wing covers. --- correct answer ---Japanese beetle adults.
What kind of damage do Japanese beetle adults cause? --- correct answer ---
feed on the silks
Answers A+ Graded Latest Update 2025
An integrated pest management program is based upon what factors? ---
correct answer ---various, economical, environmentally sound, socially
acceptable
What is the number of pests that should be controlled to prevent economic
damage from occurring? --- correct answer ---Economic threshhold
Number of pests, costs of various treatments, expected yield, and expected
grain value are all factors to determine.... --- correct answer ---Economic
Injury level
What should be done if scouting detects an important pest, but its numbers
do not reach the economic threshold? --- correct answer ---Do not treat, but
scout again later.
When scouting, where in the field should you sample? --- correct answer ---
random
What are the 4 types of control measures used in an IPM? --- correct answer
---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? --- correct answer ---Larvae
At what life-cycle stage does a corn rootworm cause ear damage by feeding
on the silks? --- correct answer ---Adult
What are the economic thresholds when scouting for corn rootworm beetles
in corn? --- correct answer ---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? --- correct answer ---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? --- correct
answer ---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? --- correct answer ---Crop debris, winter annaul weeds, late
planted
, What is the recommended method for managing black cutworms in IL? ---
correct answer ---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? ---
correct answer ---European corn borer
Damages corn by coating the tassels and silks with honeydew which reduces
pollination. --- correct answer ---Leaf Aphid
What insects have white, C-shaped, and about 1 inch long larvea which can
be differentiated by their raster patterns? --- correct answer ---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. --- correct
answer ---Japanese beetle grubs
They are metallic looking green beetles that are 3/8 to 1/2 and inch long
with coppery wing covers. --- correct answer ---Japanese beetle adults.
What kind of damage do Japanese beetle adults cause? --- correct answer ---
feed on the silks
