Illinois Field Crop Applicators Test
Questions and Answers
Various, economical, environmentally sound, socially acceptable - <CORRECT ANSWER >>An
integrated pest management program is based upon what factors?
Economic threshhold - <CORRECT ANSWER >>What is the number of pests that should be
controlled to prevent economic damage from occurring?
Economic Injury level - <CORRECT ANSWER >>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. - <CORRECT ANSWER >>What should be done if scouting
detects an important pest, but its numbers do not reach the economic threshold?
Random - <CORRECT ANSWER >>When scouting, where in the field should you sample?
Cultural, Mechanical, Biological, Chemical - <CORRECT ANSWER >>What are the 4 types of
control measures used in an IPM?
Larvae - <CORRECT ANSWER >>At what stage in the life-cycle of a Corn rootworm does it prune
and tunnel through the roots causing stalk lodging?
Adult - <CORRECT ANSWER >>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. - <CORRECT ANSWER >>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. - <CORRECT ANSWER >>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. - <CORRECT
ANSWER >>What damage does a black cutworm larvae do to corn seedlings?
Crop debris, winter annaul weeds, late planted - <CORRECT ANSWER >>What are 3 factors that
have the most potential to lead to black cutworm damage?
Rescue treatments when nessisary - <CORRECT ANSWER >>What is the recommended method
for managing black cutworms in IL?
European corn borer - <CORRECT ANSWER >>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 - <CORRECT ANSWER >>Damages corn by coating the tassels and silks with
honeydew which reduces pollination.
Japanese beetle grubs and other white grubs. - <CORRECT ANSWER >>What insects have white,
C-shaped, and about 1 inch long larvea which can be differentiated by their raster patterns?
Japanese beetle grubs - <CORRECT ANSWER >>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. - <CORRECT ANSWER >>They are metallic looking green beetles that are
3/8 to 1/2 and inch long with coppery wing covers.
Questions and Answers
Various, economical, environmentally sound, socially acceptable - <CORRECT ANSWER >>An
integrated pest management program is based upon what factors?
Economic threshhold - <CORRECT ANSWER >>What is the number of pests that should be
controlled to prevent economic damage from occurring?
Economic Injury level - <CORRECT ANSWER >>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. - <CORRECT ANSWER >>What should be done if scouting
detects an important pest, but its numbers do not reach the economic threshold?
Random - <CORRECT ANSWER >>When scouting, where in the field should you sample?
Cultural, Mechanical, Biological, Chemical - <CORRECT ANSWER >>What are the 4 types of
control measures used in an IPM?
Larvae - <CORRECT ANSWER >>At what stage in the life-cycle of a Corn rootworm does it prune
and tunnel through the roots causing stalk lodging?
Adult - <CORRECT ANSWER >>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. - <CORRECT ANSWER >>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. - <CORRECT ANSWER >>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. - <CORRECT
ANSWER >>What damage does a black cutworm larvae do to corn seedlings?
Crop debris, winter annaul weeds, late planted - <CORRECT ANSWER >>What are 3 factors that
have the most potential to lead to black cutworm damage?
Rescue treatments when nessisary - <CORRECT ANSWER >>What is the recommended method
for managing black cutworms in IL?
European corn borer - <CORRECT ANSWER >>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 - <CORRECT ANSWER >>Damages corn by coating the tassels and silks with
honeydew which reduces pollination.
Japanese beetle grubs and other white grubs. - <CORRECT ANSWER >>What insects have white,
C-shaped, and about 1 inch long larvea which can be differentiated by their raster patterns?
Japanese beetle grubs - <CORRECT ANSWER >>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. - <CORRECT ANSWER >>They are metallic looking green beetles that are
3/8 to 1/2 and inch long with coppery wing covers.
