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Illinois Field Crops Pesticide Application Exam Questions and Complete Solutions Graded A+
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Illinois Field Crops Pesticide Application Exam Questions and Complete Solutions Graded A+
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Illinois Field CropsPesticide Application
Exam Questions and
Complete Solutions
Graded A+
What is an Integrated Pest Management (IPM) program based on? - 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
What should be done if scouting detects an important pest but its numbers do not reach the economic
threshold? - Answer: Do not treat, but scout again after an appropriate time period
What is the number of pests that should be controlled to prevent economic damage from occurring? -
Answer: Economic Threshold
Factors that are considered in determining an economic injury level - Answer: - Number of pests or
estimate of the amount of damage
- Cost of various treatment options
- expected yield
- expected grain value
Economic Injury Level - Answer: the number of pests where the value of crop loss from these pests
equals the cost of controlling them
,examples of economic thresholds for some insect pests - Answer: - number of insects per plant
- number of insects per trap per week
- number of weeds per foot of row
- percent of defoliation
types of control measures used in IPM - Answer: - Cultural (rotation, fertility, resistant varieties)
- Mechanical (pest removal)
- Biological (bacteria, predators)
- Chemical
What kind of damage is caused by corn rootworm LARVAE? - Answer: - prune and tunnel through roots
- leaves plants susceptible to disease
- disrupts nutrient flow
- reduces stability
- lodging
What kind of damage is caused by corn rootworm ADULTS? - Answer: Silk Clipping (prevents pollination
& causes immature kernels)
What is the most important economic insect of pest of corn in Illinois? - Answer: Corn Rootworm
Economic thresholds when scouting for corn rootworm beetles - 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
, What kind of damage does black cutworm larvae do to corn seedlings? - Answer: young - chew holes in
leaves
older - cut plants
What types of field factors increase the potential for black cutworm damage to develop and why? -
Answer: - crop debris
- winter annual weeds
- late planted
What is the recommended methods for managing black cutworms in Illinois? - Answer: apply a rescue
treatment when 3% or more plants are cut
*preventative treatments not effective*
What type of damage does larval European corn borer cause? - Answer: - feed within the whorl causing
"shot holes" in the leaves
- ear tunneling and stalk tunneling
What type of damage does corn leaf aphid cause? - Answer: honeydew coats the tassel and possibly the
silks reducing pollination
describe wireworms and their damage - Answer: Appearance: larvae are yellow to reddish-brown, hard
shelled and wire like
Damage: tunnel into seeds and seedlings below soil level
What do Japanese beetle grubs and other white grubs look like? - Answer: Full grown larvae are white,
C-shaped, and about one inch long
How are Japanese beetle grub species identified - Answer: the pattern of bristle-like setae on the end of
the abdomen, called the raster pattern
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