Illinois Field Crops Pesticide Application
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What is an Integrated Pest Management (IPM) program based on? -
Correct Answer: - scouting for pests
- environmental information
- technology to prevent unacceptable thresholds of pest damage by
most economic means
- lowest possible risk to people, property, resources and environment
2. What should be done if scouting detects an important pest but its numbers
do not reach the economic threshold? - Correct Answer: Do not treat,
but scout again after an appropriate time period
3. What is the number of pests that should be controlled to prevent economic
damage from occurring? - Correct Answer: Economic Threshold
4. Factors that are considered in determining an economic injury level -
Correct Answer: - Number of pests or estimate of the amount of damage
- Cost of various treatment options
- expected yield
- expected grain value
,5. Economic Injury Level - Correct Answer: the number of pests where the
value of crop loss from these pests equals the cost of controlling them
6. examples of economic thresholds for some insect pests - Correct
Answer: - number of insects per plant
- number of insects per trap per week
- number of weeds per foot of row
- percent of defoliation
7. types of control measures used in IPM - Correct Answer: - Cultural
(rotation, fertility, resistant varieties)
- Mechanical (pest removal)
- Biological (bacteria, predators)
- Chemical
8. What kind of damage is caused by corn rootworm LARVAE? - Correct
Answer: - prune and tunnel through roots
- leaves plants susceptible to disease
- disrupts nutrient flow
- reduces stability
- lodging
9. What kind of damage is caused by corn rootworm ADULTS? - Correct
Answer: Silk Clipping (prevents pollination & causes immature kernels)
10.What is the most important economic insect of pest of corn in Illinois? -
Correct Answer: Corn Rootworm
,11.Economic thresholds when scouting for corn rootworm beetles -
Correct Answer: - when silks are green
- if silks are clipped within 1/2 inch of the tip of the ear
- from late July to early August
IN SOYBEANS- 1.5 beetles per unbaited Pherocon AM trap per day
IN CONTINOUS CORN- 2 beetles per unbaited Pherocon AM trap per day
12.What kind of damage does black cutworm larvae do to corn seedlings? -
Correct Answer: young - chew holes in leaves
older - cut plants
13.What types of field factors increase the potential for black cutworm damage
to develop and why? - Correct Answer: - crop debris
- winter annual weeds
- late planted
14.What is the recommended methods for managing black cutworms in
Illinois? - Correct Answer: apply a rescue treatment when 3% or more
plants are cut
*preventative treatments not effective*
15.What type of damage does larval European corn borer cause? - Correct
Answer: - feed within the whorl causing "shot holes" in the leaves
- ear tunneling and stalk tunneling
, 16.What type of damage does corn leaf aphid cause? - Correct Answer:
honeydew coats the tassel and possibly the silks reducing pollination
17.describe wireworms and their damage - Correct Answer: Appearance:
larvae are yellow to reddish-brown, hard shelled and wire like
Damage: tunnel into seeds and seedlings below soil level
18.What do Japanese beetle grubs and other white grubs look like? -
Correct Answer: Full grown larvae are white, C-shaped, and about one inch
long
19.How are Japanese beetle grub species identified - Correct Answer: the
pattern of bristle-like setae on the end of the abdomen, called the raster
pattern
20.What kind of damage do Japanese beetle grubs cause? - Correct
Answer: - chew on roots and root hairs of seedlings
- results in irregular emergence, reduced stands and stunted or wilted
plants
- injured plants may turn purple because they cannot take up
phosphorous efficiently
21.What do Japanese beetle adults look like? - Correct Answer: Metallic
green beetles that are 3/8 to 1/2 inch long with coppery wing covers
22.What kind of damage do japanese beetle adults cause - Correct Answer:
clip silks on corn ears
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What is an Integrated Pest Management (IPM) program based on? -
Correct Answer: - scouting for pests
- environmental information
- technology to prevent unacceptable thresholds of pest damage by
most economic means
- lowest possible risk to people, property, resources and environment
2. What should be done if scouting detects an important pest but its numbers
do not reach the economic threshold? - Correct Answer: Do not treat,
but scout again after an appropriate time period
3. What is the number of pests that should be controlled to prevent economic
damage from occurring? - Correct Answer: Economic Threshold
4. Factors that are considered in determining an economic injury level -
Correct Answer: - Number of pests or estimate of the amount of damage
- Cost of various treatment options
- expected yield
- expected grain value
,5. Economic Injury Level - Correct Answer: the number of pests where the
value of crop loss from these pests equals the cost of controlling them
6. examples of economic thresholds for some insect pests - Correct
Answer: - number of insects per plant
- number of insects per trap per week
- number of weeds per foot of row
- percent of defoliation
7. types of control measures used in IPM - Correct Answer: - Cultural
(rotation, fertility, resistant varieties)
- Mechanical (pest removal)
- Biological (bacteria, predators)
- Chemical
8. What kind of damage is caused by corn rootworm LARVAE? - Correct
Answer: - prune and tunnel through roots
- leaves plants susceptible to disease
- disrupts nutrient flow
- reduces stability
- lodging
9. What kind of damage is caused by corn rootworm ADULTS? - Correct
Answer: Silk Clipping (prevents pollination & causes immature kernels)
10.What is the most important economic insect of pest of corn in Illinois? -
Correct Answer: Corn Rootworm
,11.Economic thresholds when scouting for corn rootworm beetles -
Correct Answer: - when silks are green
- if silks are clipped within 1/2 inch of the tip of the ear
- from late July to early August
IN SOYBEANS- 1.5 beetles per unbaited Pherocon AM trap per day
IN CONTINOUS CORN- 2 beetles per unbaited Pherocon AM trap per day
12.What kind of damage does black cutworm larvae do to corn seedlings? -
Correct Answer: young - chew holes in leaves
older - cut plants
13.What types of field factors increase the potential for black cutworm damage
to develop and why? - Correct Answer: - crop debris
- winter annual weeds
- late planted
14.What is the recommended methods for managing black cutworms in
Illinois? - Correct Answer: apply a rescue treatment when 3% or more
plants are cut
*preventative treatments not effective*
15.What type of damage does larval European corn borer cause? - Correct
Answer: - feed within the whorl causing "shot holes" in the leaves
- ear tunneling and stalk tunneling
, 16.What type of damage does corn leaf aphid cause? - Correct Answer:
honeydew coats the tassel and possibly the silks reducing pollination
17.describe wireworms and their damage - Correct Answer: Appearance:
larvae are yellow to reddish-brown, hard shelled and wire like
Damage: tunnel into seeds and seedlings below soil level
18.What do Japanese beetle grubs and other white grubs look like? -
Correct Answer: Full grown larvae are white, C-shaped, and about one inch
long
19.How are Japanese beetle grub species identified - Correct Answer: the
pattern of bristle-like setae on the end of the abdomen, called the raster
pattern
20.What kind of damage do Japanese beetle grubs cause? - Correct
Answer: - chew on roots and root hairs of seedlings
- results in irregular emergence, reduced stands and stunted or wilted
plants
- injured plants may turn purple because they cannot take up
phosphorous efficiently
21.What do Japanese beetle adults look like? - Correct Answer: Metallic
green beetles that are 3/8 to 1/2 inch long with coppery wing covers
22.What kind of damage do japanese beetle adults cause - Correct Answer:
clip silks on corn ears
