Illinois Field Crop Applicators Test questions with verified detailed
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answers
An integrated pest management program is based upon what factors? - ✔✔various,
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economical, environmentally sound, socially acceptable || || || ||
What is the number of pests that should be controlled to prevent economic damage from
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occurring? - ✔✔Economic threshhold || || ||
Number of pests, costs of various treatments, expected yield, and expected grain value are
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all factors to determine.... - ✔✔Economic Injury level
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What should be done if scouting detects an important pest, but its numbers do not reach the
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economic threshold? - ✔✔Do not treat, but scout again later.
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When scouting, where in the field should you sample? - ✔✔random
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What are the 4 types of control measures used in an IPM? - ✔✔Cultural, Mechanical,
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Biological, Chemical ||
At what stage in the life-cycle of a Corn rootworm does it prune and tunnel through the
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roots causing stalk lodging? - ✔✔Larvae
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At what life-cycle stage does a corn rootworm cause ear damage by feeding on the silks? -
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✔✔Adult
, What are the economic thresholds when scouting for corn rootworm beetles in corn? -
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✔✔When silks are green, 5 or more beetles per plant if silks are clipped within 1/2 inch of
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the ear tip.
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What are the economic thresholds when scouting for corn rootworm beetles in soy? -
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✔✔From late July to late august at least 5 beetles per unbaited pherocon AM trap in
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soybeans or .75 beetles per plant in non-rotated corn.
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What damage does a black cutworm larvae do to corn seedlings? - ✔✔feed on the leaves
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and older larvae cause leaf cutting leading to reduced stands.
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What are 3 factors that have the most potential to lead to black cutworm damage? -
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✔✔Crop debris, winter annaul weeds, late planted
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What is the recommended method for managing black cutworms in IL? - ✔✔rescue
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treatments when nessisary || ||
What type of larvae causes whorl damage in 1st generation, stalk tunneling damage in the
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2nd generation with possible ear tunneling and stalk rot? - ✔✔European corn borer
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Damages corn by coating the tassels and silks with honeydew which reduces pollination. -
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✔✔Leaf Aphid ||
What insects have white, C-shaped, and about 1 inch long larvea which can be
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differentiated by their raster patterns? - ✔✔Japanese beetle grubs and other white grubs.
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They chew on the roots and root hairs of seedlings resulting in irregular emergence,
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reduced stands, and stunted or wilted plants. Injured plants may turn purple because they
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cannot take up phosphorus. - ✔✔Japanese beetle grubs
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answers
An integrated pest management program is based upon what factors? - ✔✔various,
|| || || || || || || || || || || ||
economical, environmentally sound, socially acceptable || || || ||
What is the number of pests that should be controlled to prevent economic damage from
|| || || || || || || || || || || || || || ||
occurring? - ✔✔Economic threshhold || || ||
Number of pests, costs of various treatments, expected yield, and expected grain value are
|| || || || || || || || || || || || || ||
all factors to determine.... - ✔✔Economic Injury level
|| || || || || || ||
What should be done if scouting detects an important pest, but its numbers do not reach the
|| || || || || || || || || || || || || || || ||
economic threshold? - ✔✔Do not treat, but scout again later.
|| || || || || || || || || ||
When scouting, where in the field should you sample? - ✔✔random
|| || || || || || || || || ||
What are the 4 types of control measures used in an IPM? - ✔✔Cultural, Mechanical,
|| || || || || || || || || || || || || || ||
Biological, Chemical ||
At what stage in the life-cycle of a Corn rootworm does it prune and tunnel through the
|| || || || || || || || || || || || || || || || ||
roots causing stalk lodging? - ✔✔Larvae
|| || || || ||
At what life-cycle stage does a corn rootworm cause ear damage by feeding on the silks? -
|| || || || || || || || || || || || || || || || ||
✔✔Adult
, What are the economic thresholds when scouting for corn rootworm beetles in corn? -
|| || || || || || || || || || || || || ||
✔✔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 soy? -
|| || || || || || || || || || || || || ||
✔✔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 damage does a black cutworm larvae do to corn seedlings? - ✔✔feed on the leaves
|| || || || || || || || || || || || || || || ||
and older larvae cause leaf cutting leading to reduced stands.
|| || || || || || || || ||
What are 3 factors that have the most potential to lead to black cutworm damage? -
|| || || || || || || || || || || || || || || ||
✔✔Crop debris, winter annaul weeds, late planted
|| || || || || ||
What is the recommended method for managing black cutworms in IL? - ✔✔rescue
|| || || || || || || || || || || || ||
treatments when nessisary || ||
What type of larvae causes whorl damage in 1st generation, stalk tunneling damage in the
|| || || || || || || || || || || || || || ||
2nd generation with possible ear tunneling and stalk rot? - ✔✔European corn borer
|| || || || || || || || || || || ||
Damages corn by coating the tassels and silks with honeydew which reduces pollination. -
|| || || || || || || || || || || || || ||
✔✔Leaf Aphid ||
What insects have white, C-shaped, and about 1 inch long larvea which can be
|| || || || || || || || || || || || || ||
differentiated by their raster patterns? - ✔✔Japanese beetle grubs and other white grubs.
|| || || || || || || || || || || ||
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 grubs
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