Free CO-PEST Practice Questions

Question 1

A tomato insecticide label states: restricted-entry interval (REI), 12 hours; preharvest interval (PHI), 7 days; retreatment interval, 5 days; maximum, 3 applications per season. A field was treated Monday at 6:00 a.m. Workers reentered Tuesday at 8:00 a.m., and harvest is planned for Sunday at 6:00 a.m. No other applications have been made. Which conclusion is correct?

Accepted Answer

Reentry is permitted, but Sunday harvest is prohibited because the 7-day PHI has not elapsed

Answer

Both reentry and harvest are permitted because the 12-hour REI has passed

Answer

Reentry is prohibited until the 5-day retreatment interval has passed

Answer

Sunday harvest is permitted if no worker entered during the first 12 hours

Question 2

During cleanup of a leaking insecticide, a worker develops pinpoint pupils, profuse salivation, wheezing, abdominal cramps, and muscle twitching. What is the immediate priority?

Accepted Answer

Stop exposure, protect rescuers, decontaminate, and call 911

Answer

Induce vomiting, then give milk to dilute any swallowed pesticide

Answer

Move the worker to shade and observe for one hour as heat exhaustion

Answer

Wash the affected skin and resume work when the twitching subsides

Question 3

At the planned pressure, four boom nozzles deliver 20, 20, 19, and 17 fluid ounces during equal collection times. The boom average is 19 fluid ounces. A nozzle that remains more than 10% from the average after cleaning should be replaced. Cleaning does not change the outputs. What should the applicator do?

Accepted Answer

Replace the 17-ounce nozzle, then retest and recalibrate the boom

Answer

Raise pressure until the 17-ounce nozzle reaches the average

Answer

Keep the set because every nozzle is within 2 ounces of the average

Answer

Replace all four nozzles because the boom average is too low

Question 4

At sunrise on a calm morning, smoke from a field test forms a flat layer near the ground and moves sideways instead of dispersing upward. The wind meter reads 2 mph, and the label prohibits application during an inversion. What is the sound decision?

Accepted Answer

Delay until the inversion breaks and smoke begins dispersing upward

Answer

Apply now because very light wind prevents meaningful off-target movement

Answer

Raise spray pressure so droplets penetrate the stable layer more quickly

Answer

Raise the boom and use finer droplets to improve coverage in the calm air

Question 5

A greenhouse scouting program sets an action threshold of 8 whitefly adults per sticky card per week. Counts have risen from 3 to 5, parasitoid activity is increasing, and plants show no marketable injury. What action best follows integrated pest management?

Accepted Answer

Continue monitoring, maintain sanitation, and conserve the parasitoids

Answer

Treat every bench now because any upward trend overrides the threshold

Answer

Stop scouting for two weeks after releasing additional parasitoids

Answer

Lower the threshold to 5 because the current count has reached that level

Question 6

Two postemergence herbicides have different trade names but the same mode-of-action group. After repeated use, surviving weeds produce seed. The manager proposes alternating the two brands next season. Which change would better address resistance selection?

Accepted Answer

Rotate to different effective modes of action and integrate nonchemical controls

Answer

Apply each brand below its labeled rate so fewer weeds are exposed

Answer

Tank mix the two brands at half rates because the names are different

Answer

Keep one brand but increase carrier volume at every application

Question 7

A foliar label specifies 1 quart of product per acre in 10 to 20 gallons of water per acre. Dense foliage requires increasing carrier volume from 10 to 20 GPA. How should the mixture be adjusted while preserving the labeled pesticide rate?

Accepted Answer

Keep 1 quart per acre and halve the product concentration in each gallon

Answer

Increase product to 2 quarts per acre because the carrier volume doubled

Answer

Keep the original tank concentration and double travel speed

Answer

Reduce product to 1/2 quart per acre because more water improves activity

Question 8

A Colorado employee holds a Certified Operator license in the required category. The company asks her to inspect a client's property, independently diagnose the pest problem, recommend the control program, and sell the service without Qualified Supervisor involvement. Which statement is accurate?

Accepted Answer

Those independent functions require a QS; a CO license alone is insufficient

Answer

Category certification allows a CO to perform all of those functions independently

Answer

A CO may diagnose and recommend independently when the application category is held

Answer

A CO may sell the service if a QS reviews the application record afterward

Question 9

Acute testing of a formulated pesticide shows an oral LD50 of 900 mg/kg, a dermal LD50 of 4,500 mg/kg, an inhalation LC50 of 6 mg/L, and irreversible corneal damage. What front-panel labeling is required by the most severe endpoint?

Accepted Answer

DANGER, without POISON or the skull-and-crossbones based solely on these data

Answer

DANGER plus POISON and the skull-and-crossbones because any Category I endpoint requires them

Answer

WARNING because irreversible eye damage does not determine the signal word

Answer

CAUTION because the oral, dermal, and inhalation endpoints are Category III

Question 10

After 90 minutes of work in protective equipment on a hot afternoon, an applicator is alert but sweating heavily, pale and clammy, dizzy, nauseated, and has a fast weak pulse. There is no confusion, seizure, collapse, or known pesticide spill. What is the most appropriate initial response?

Accepted Answer

Stop work, cool the applicator, provide water, and monitor

Answer

Call 911 and treat the condition as confirmed heat stroke

Answer

Give salt tablets and return the applicator to light work after 10 minutes

Answer

Keep all protective equipment on until the shift ends, then allow rest

Free CO-PEST Practice Questions

Domain 1: Pest Management Strategies

Question 1

Question 2

Domain 2: Pesticide Properties

Question 3

Question 4

Domain 3: Environmental and Public Safety Considerations

Question 5

Domain 4: Applicator Safety

Question 6

Domain 5: Making Applications

Question 7

Domain 6: Laws and Regulations

Question 8

More CO-PEST practice questions

Question 9

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