Illinois Field Crop Applicators Test 2024 (100%
CORRECT ANSWERS WITH COMPLETE
various, economical,
SOLUTION)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.
feed on the silks - CORRECT ANSWER What kind of damage do Japanese
beetle adults cause?
adult bean leaf beetle. - CORRECT ANSWER 1/4 inch beetle, black triangle on
neck just below the head?
, Illinois Field Crop Applicators Test 2024 (100%
CORRECT ANSWERS WITH COMPLETE
16 or more - SOLUTION)
CORRECT ANSWER 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% - CORRECT ANSWER 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 - CORRECT ANSWER when bean leaf
beetles feed during pod fill what is the percentage of defoliation or damaged pods
that is the economic threshold?
soybean aphids - CORRECT ANSWER pinhead sized, yellow, round, soft bodied,
insects on the undersides of soybean leaves
soybean aphids - CORRECT ANSWER What pest causes the following damage:
suck sap from sobean plants causing the leaves to curl and turn yellow, excrete
honeydew, sooty mold grows on the honeydew lowering photosynthesis, heavy
infestations cause lowers pod counts, and they act as a vector for pathogens.
spider mites - CORRECT ANSWER What pest causes the following damage:
Stripping leaves, fine silk on leaves and between plants, bronzing leaves, curled
leaves and leaf drop.
Larvae - CORRECT ANSWER What alfalfa weevil lifecycle stage is described
here: up to 1/2 inch long with dark heel. Green with stripe down back.
adult - CORRECT ANSWER What alfalfa weevil lifecycle stage is described here:
1/2 inch long beetle that is meduim brown w/ dark brown stripe. hard shell.
alfalfa weevil - CORRECT ANSWER What pest causes this damage: larvae
skeltonize leaves, causes fields to appear frosted, adults feather the leaves and
chew stems
alfalfa weevil - CORRECT ANSWER What 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 - CORRECT ANSWER Name this pest: 1/8 inch long, green,
wedge shaped
potato leafhopper - CORRECT ANSWER what pest causes this damage:
yellowish leaflets and dark brown triangular leaflet tips.
after the first crop - CORRECT ANSWER when 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 - CORRECT ANSWER name 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 - CORRECT ANSWER The 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 - CORRECT ANSWER the 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 - CORRECT ANSWER The following methods of controlling insect
pests are examples of what type of method?
-tachinid flies parasitizing army worms
-genetically modified corn containing Bt
CORRECT ANSWERS WITH COMPLETE
various, economical,
SOLUTION)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.
feed on the silks - CORRECT ANSWER What kind of damage do Japanese
beetle adults cause?
adult bean leaf beetle. - CORRECT ANSWER 1/4 inch beetle, black triangle on
neck just below the head?
, Illinois Field Crop Applicators Test 2024 (100%
CORRECT ANSWERS WITH COMPLETE
16 or more - SOLUTION)
CORRECT ANSWER 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% - CORRECT ANSWER 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 - CORRECT ANSWER when bean leaf
beetles feed during pod fill what is the percentage of defoliation or damaged pods
that is the economic threshold?
soybean aphids - CORRECT ANSWER pinhead sized, yellow, round, soft bodied,
insects on the undersides of soybean leaves
soybean aphids - CORRECT ANSWER What pest causes the following damage:
suck sap from sobean plants causing the leaves to curl and turn yellow, excrete
honeydew, sooty mold grows on the honeydew lowering photosynthesis, heavy
infestations cause lowers pod counts, and they act as a vector for pathogens.
spider mites - CORRECT ANSWER What pest causes the following damage:
Stripping leaves, fine silk on leaves and between plants, bronzing leaves, curled
leaves and leaf drop.
Larvae - CORRECT ANSWER What alfalfa weevil lifecycle stage is described
here: up to 1/2 inch long with dark heel. Green with stripe down back.
adult - CORRECT ANSWER What alfalfa weevil lifecycle stage is described here:
1/2 inch long beetle that is meduim brown w/ dark brown stripe. hard shell.
alfalfa weevil - CORRECT ANSWER What pest causes this damage: larvae
skeltonize leaves, causes fields to appear frosted, adults feather the leaves and
chew stems
alfalfa weevil - CORRECT ANSWER What 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 - CORRECT ANSWER Name this pest: 1/8 inch long, green,
wedge shaped
potato leafhopper - CORRECT ANSWER what pest causes this damage:
yellowish leaflets and dark brown triangular leaflet tips.
after the first crop - CORRECT ANSWER when 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 - CORRECT ANSWER name 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 - CORRECT ANSWER The 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 - CORRECT ANSWER the 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 - CORRECT ANSWER The following methods of controlling insect
pests are examples of what type of method?
-tachinid flies parasitizing army worms
-genetically modified corn containing Bt
