Illinois Field Crop Applicators Test/102
Questions &Verified Answers {GRADED A+}
various, economical, environmentally sound, socially acceptable - ANS✔✔--An
integrated pest management program is based upon what factors?
after the first crop - ANS✔✔--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 - ANS✔✔--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 - ANS✔✔--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
Economic threshhold - ANS✔✔--What is the number of pests that should be
controlled to prevent economic damage from occurring?
Economic Injury level - ANS✔✔--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. - ANS✔✔--What should be done if scouting
detects an important pest, but its numbers do not reach the economic threshold?
random - ANS✔✔--When scouting, where in the field should you sample?
Cultural, Mechanical, Biological, Chemical - ANS✔✔--What are the 4 types of control
measures used in an IPM?
Larvae - ANS✔✔--At what stage in the life-cycle of a Corn rootworm does it prune
and tunnel through the roots causing stalk lodging?
Adult - ANS✔✔--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. - ANS✔✔--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. - ANS✔✔--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. -
ANS✔✔--What damage does a black cutworm larvae do to corn seedlings?
Crop debris, winter annaul weeds, late planted - ANS✔✔--What are 3 factors that
have the most potential to lead to black cutworm damage?
rescue treatments when nessisary - ANS✔✔--What is the recommended method for
managing black cutworms in IL?
European corn borer - ANS✔✔--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 - ANS✔✔--Damages corn by coating the tassels and silks with honeydew
which reduces pollination.
Japanese beetle grubs and other white grubs. - ANS✔✔--What insects have white,
C-shaped, and about 1 inch long larvea which can be differentiated by their raster
patterns?
Japanese beetle grubs - ANS✔✔--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. - ANS✔✔--They are metallic looking green beetles that are
3/8 to 1/2 and inch long with coppery wing covers.
feed on the silks - ANS✔✔--What kind of damage do Japanese beetle adults cause?
adult bean leaf beetle. - ANS✔✔--1/4 inch beetle, black triangle on neck just below
the head?
16 or more - ANS✔✔--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% - ANS✔✔--When bean leaf beetles eat holes in leaves during the vegetative
growth stage what is the percent defoliation that is the economic threshold?
Questions &Verified Answers {GRADED A+}
various, economical, environmentally sound, socially acceptable - ANS✔✔--An
integrated pest management program is based upon what factors?
after the first crop - ANS✔✔--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 - ANS✔✔--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 - ANS✔✔--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
Economic threshhold - ANS✔✔--What is the number of pests that should be
controlled to prevent economic damage from occurring?
Economic Injury level - ANS✔✔--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. - ANS✔✔--What should be done if scouting
detects an important pest, but its numbers do not reach the economic threshold?
random - ANS✔✔--When scouting, where in the field should you sample?
Cultural, Mechanical, Biological, Chemical - ANS✔✔--What are the 4 types of control
measures used in an IPM?
Larvae - ANS✔✔--At what stage in the life-cycle of a Corn rootworm does it prune
and tunnel through the roots causing stalk lodging?
Adult - ANS✔✔--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. - ANS✔✔--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. - ANS✔✔--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. -
ANS✔✔--What damage does a black cutworm larvae do to corn seedlings?
Crop debris, winter annaul weeds, late planted - ANS✔✔--What are 3 factors that
have the most potential to lead to black cutworm damage?
rescue treatments when nessisary - ANS✔✔--What is the recommended method for
managing black cutworms in IL?
European corn borer - ANS✔✔--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 - ANS✔✔--Damages corn by coating the tassels and silks with honeydew
which reduces pollination.
Japanese beetle grubs and other white grubs. - ANS✔✔--What insects have white,
C-shaped, and about 1 inch long larvea which can be differentiated by their raster
patterns?
Japanese beetle grubs - ANS✔✔--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. - ANS✔✔--They are metallic looking green beetles that are
3/8 to 1/2 and inch long with coppery wing covers.
feed on the silks - ANS✔✔--What kind of damage do Japanese beetle adults cause?
adult bean leaf beetle. - ANS✔✔--1/4 inch beetle, black triangle on neck just below
the head?
16 or more - ANS✔✔--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% - ANS✔✔--When bean leaf beetles eat holes in leaves during the vegetative
growth stage what is the percent defoliation that is the economic threshold?
