Illinois Field Crop Applicators Test
Questions And Correct Answers
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?
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.
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?
Questions And Correct Answers
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?
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.
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?
