Illinois Field Crop Applicators Test
Questions and Answers 100% Pass
various, economical, environmentally sound, socially acceptable - ✔✔An integrated
pest management program is based upon what factors?
Economic threshhold - ✔✔What is the number of pests that should be controlled to
prevent economic damage from occurring?
Economic Injury level - ✔✔Number of pests, costs of various treatments, expected yield,
and expected grain value are all factors to determine....
Do not treat, but scout again later. - ✔✔What should be done if scouting detects an
important pest, but its numbers do not reach the economic threshold?
random - ✔✔When scouting, where in the field should you sample?
Cultural, Mechanical, Biological, Chemical - ✔✔What are the 4 types of control
measures used in an IPM?
Larvae - ✔✔At what stage in the life-cycle of a Corn rootworm does it prune and tunnel
through the roots causing stalk lodging?
Katelyn Whitman, All Rights Reserved © 2025 1
,Adult - ✔✔At what life-cycle stage does a corn rootworm cause ear damage by feeding
on the silks?
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 corn?
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 are the economic
thresholds when scouting for corn rootworm beetles in soy?
feed on the leaves and older larvae cause leaf cutting leading to reduced stands. -
✔✔What damage does a black cutworm larvae do to corn seedlings?
Crop debris, winter annaul weeds, late planted - ✔✔What are 3 factors that have the
most potential to lead to black cutworm damage?
rescue treatments when nessisary - ✔✔What is the recommended method for managing
black cutworms in IL?
European corn borer - ✔✔What type of larvae causes whorl damage in 1st generation,
stalk tunneling damage in the 2nd generation with possible ear tunneling and stalk rot?
Leaf Aphid - ✔✔Damages corn by coating the tassels and silks with honeydew which
reduces pollination.
Katelyn Whitman, All Rights Reserved © 2025 2
, Japanese beetle grubs and other white grubs. - ✔✔What insects have white, C-shaped,
and about 1 inch long larvea which can be differentiated by their raster patterns?
Japanese beetle 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.
Japanese beetle adults. - ✔✔They are metallic looking green beetles that are 3/8 to 1/2
and inch long with coppery wing covers.
feed on the silks - ✔✔What kind of damage do Japanese beetle adults cause?
adult bean leaf beetle. - ✔✔1/4 inch beetle, black triangle on neck just below the head?
16 or more - ✔✔When bean leaf beetles feed on cotyledons and first true leaves what is
the amount of beetles per foot of row that is the economic threshold?
30-40% - ✔✔When bean leaf beetles eat holes in leaves during the vegetative growth
stage what is the percent defoliation that is the economic threshold?
20% defoliation or 5-10% injured pods - ✔✔when bean leaf beetles feed during pod fill
what is the percentage of defoliation or damaged pods that is the economic threshold?
soybean aphids - ✔✔pinhead sized, yellow, round, soft bodied, insects on the
undersides of soybean leaves
Katelyn Whitman, All Rights Reserved © 2025 3
Questions and Answers 100% Pass
various, economical, environmentally sound, socially acceptable - ✔✔An integrated
pest management program is based upon what factors?
Economic threshhold - ✔✔What is the number of pests that should be controlled to
prevent economic damage from occurring?
Economic Injury level - ✔✔Number of pests, costs of various treatments, expected yield,
and expected grain value are all factors to determine....
Do not treat, but scout again later. - ✔✔What should be done if scouting detects an
important pest, but its numbers do not reach the economic threshold?
random - ✔✔When scouting, where in the field should you sample?
Cultural, Mechanical, Biological, Chemical - ✔✔What are the 4 types of control
measures used in an IPM?
Larvae - ✔✔At what stage in the life-cycle of a Corn rootworm does it prune and tunnel
through the roots causing stalk lodging?
Katelyn Whitman, All Rights Reserved © 2025 1
,Adult - ✔✔At what life-cycle stage does a corn rootworm cause ear damage by feeding
on the silks?
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 corn?
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 are the economic
thresholds when scouting for corn rootworm beetles in soy?
feed on the leaves and older larvae cause leaf cutting leading to reduced stands. -
✔✔What damage does a black cutworm larvae do to corn seedlings?
Crop debris, winter annaul weeds, late planted - ✔✔What are 3 factors that have the
most potential to lead to black cutworm damage?
rescue treatments when nessisary - ✔✔What is the recommended method for managing
black cutworms in IL?
European corn borer - ✔✔What type of larvae causes whorl damage in 1st generation,
stalk tunneling damage in the 2nd generation with possible ear tunneling and stalk rot?
Leaf Aphid - ✔✔Damages corn by coating the tassels and silks with honeydew which
reduces pollination.
Katelyn Whitman, All Rights Reserved © 2025 2
, Japanese beetle grubs and other white grubs. - ✔✔What insects have white, C-shaped,
and about 1 inch long larvea which can be differentiated by their raster patterns?
Japanese beetle 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.
Japanese beetle adults. - ✔✔They are metallic looking green beetles that are 3/8 to 1/2
and inch long with coppery wing covers.
feed on the silks - ✔✔What kind of damage do Japanese beetle adults cause?
adult bean leaf beetle. - ✔✔1/4 inch beetle, black triangle on neck just below the head?
16 or more - ✔✔When bean leaf beetles feed on cotyledons and first true leaves what is
the amount of beetles per foot of row that is the economic threshold?
30-40% - ✔✔When bean leaf beetles eat holes in leaves during the vegetative growth
stage what is the percent defoliation that is the economic threshold?
20% defoliation or 5-10% injured pods - ✔✔when bean leaf beetles feed during pod fill
what is the percentage of defoliation or damaged pods that is the economic threshold?
soybean aphids - ✔✔pinhead sized, yellow, round, soft bodied, insects on the
undersides of soybean leaves
Katelyn Whitman, All Rights Reserved © 2025 3
