ILLINOIS FIELD CROP APPLICATORS
TEST QUESTIONS &
ANSWERS(RATED A+)
various, economical, environmentally sound, socially acceptable - ANSWERAn
integrated pest management program is based upon what factors?
Economic threshhold - ANSWERWhat is the number of pests that should be controlled
to prevent economic damage from occurring?
Economic Injury level - ANSWERNumber of pests, costs of various treatments,
expected yield, and expected grain value are all factors to determine....
Do not treat, but scout again later. - ANSWERWhat should be done if scouting detects
an important pest, but its numbers do not reach the economic threshold?
random - ANSWERWhen scouting, where in the field should you sample?
Cultural, Mechanical, Biological, Chemical - ANSWERWhat are the 4 types of control
measures used in an IPM?
Larvae - ANSWERAt what stage in the life-cycle of a Corn rootworm does it prune and
tunnel through the roots causing stalk lodging?
Adult - ANSWERAt 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. - ANSWERWhat 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. - ANSWERWhat 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. -
ANSWERWhat damage does a black cutworm larvae do to corn seedlings?
Crop debris, winter annaul weeds, late planted - ANSWERWhat are 3 factors that have
the most potential to lead to black cutworm damage?
rescue treatments when nessisary - ANSWERWhat is the recommended method for
managing black cutworms in IL?
, European corn borer - ANSWERWhat 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 - ANSWERDamages corn by coating the tassels and silks with honeydew
which reduces pollination.
adult - ANSWERWhat alfalfa weevil lifecycle stage is described here: 1/2 inch long
beetle that is meduim brown w/ dark brown stripe. hard shell.
alfalfa weevil - ANSWERWhat pest causes this damage: larvae skeltonize leaves,
causes fields to appear frosted, adults feather the leaves and chew stems
alfalfa weevil - ANSWERWhat pest has this economic threshold? first crop- 3 or more
larvae per stem and 20% of the tips skeletonized.
later cuttings- feeding on 50% of crowns and no regrowth for 3-6 days.
potato leafhopper - ANSWERName this pest: 1/8 inch long, green, wedge shaped
potato leafhopper - ANSWERwhat pest causes this damage: yellowish leaflets and dark
brown triangular leaflet tips.
after the first crop - ANSWERwhen is alfalfa most susceptible to potato leafhopper
damage and as a consequence when is the most critical time to scout for this pest?
armyworm larvae - ANSWERname the pest- Appearance is grean brown w/ orange
stripes up to 1.5 inches long. Damage they cause is feed at night and on cloudy days
chewing through wheat stems causing heads to fall off.
Cultural - ANSWERThe following methods of controlling insect pest are examples of
what type of method?
-Fly free wheat planting dates for hessian flies
-Early cutting of alfalfa to reduce alfalfa weevil damage
Mechanical - ANSWERthe following methods of controlling insect pests are examples of
what type of method?
-Tillage to destroy overwintering grasshopper eggs
-late season weed removal to control stalk borer
biological - ANSWERThe following methods of controlling insect pests are examples of
what type of method?
-tachinid flies parasitizing army worms
-genetically modified corn containing Bt
TEST QUESTIONS &
ANSWERS(RATED A+)
various, economical, environmentally sound, socially acceptable - ANSWERAn
integrated pest management program is based upon what factors?
Economic threshhold - ANSWERWhat is the number of pests that should be controlled
to prevent economic damage from occurring?
Economic Injury level - ANSWERNumber of pests, costs of various treatments,
expected yield, and expected grain value are all factors to determine....
Do not treat, but scout again later. - ANSWERWhat should be done if scouting detects
an important pest, but its numbers do not reach the economic threshold?
random - ANSWERWhen scouting, where in the field should you sample?
Cultural, Mechanical, Biological, Chemical - ANSWERWhat are the 4 types of control
measures used in an IPM?
Larvae - ANSWERAt what stage in the life-cycle of a Corn rootworm does it prune and
tunnel through the roots causing stalk lodging?
Adult - ANSWERAt 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. - ANSWERWhat 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. - ANSWERWhat 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. -
ANSWERWhat damage does a black cutworm larvae do to corn seedlings?
Crop debris, winter annaul weeds, late planted - ANSWERWhat are 3 factors that have
the most potential to lead to black cutworm damage?
rescue treatments when nessisary - ANSWERWhat is the recommended method for
managing black cutworms in IL?
, European corn borer - ANSWERWhat 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 - ANSWERDamages corn by coating the tassels and silks with honeydew
which reduces pollination.
adult - ANSWERWhat alfalfa weevil lifecycle stage is described here: 1/2 inch long
beetle that is meduim brown w/ dark brown stripe. hard shell.
alfalfa weevil - ANSWERWhat pest causes this damage: larvae skeltonize leaves,
causes fields to appear frosted, adults feather the leaves and chew stems
alfalfa weevil - ANSWERWhat pest has this economic threshold? first crop- 3 or more
larvae per stem and 20% of the tips skeletonized.
later cuttings- feeding on 50% of crowns and no regrowth for 3-6 days.
potato leafhopper - ANSWERName this pest: 1/8 inch long, green, wedge shaped
potato leafhopper - ANSWERwhat pest causes this damage: yellowish leaflets and dark
brown triangular leaflet tips.
after the first crop - ANSWERwhen is alfalfa most susceptible to potato leafhopper
damage and as a consequence when is the most critical time to scout for this pest?
armyworm larvae - ANSWERname the pest- Appearance is grean brown w/ orange
stripes up to 1.5 inches long. Damage they cause is feed at night and on cloudy days
chewing through wheat stems causing heads to fall off.
Cultural - ANSWERThe following methods of controlling insect pest are examples of
what type of method?
-Fly free wheat planting dates for hessian flies
-Early cutting of alfalfa to reduce alfalfa weevil damage
Mechanical - ANSWERthe following methods of controlling insect pests are examples of
what type of method?
-Tillage to destroy overwintering grasshopper eggs
-late season weed removal to control stalk borer
biological - ANSWERThe following methods of controlling insect pests are examples of
what type of method?
-tachinid flies parasitizing army worms
-genetically modified corn containing Bt
