10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The OK-PEST exam has 50 questions and runs 1 hours 15 minutes.
These 10 free OK-PEST questions are organized by exam domain, so you can see how each part of the Oklahoma Commercial Pesticide Applicator Core Exam blueprint is tested. Reveal the answer and explanation under each question.
A turf herbicide label permits 1-2 fl oz of product per 1,000 square feet per application, no more than 6 fl oz per 1,000 square feet per calendar year, and at least 21 days between applications. An 8,000-square-foot lawn has already received 4.5 fl oz per 1,000 square feet this year; its last treatment was 28 days ago. Under these limits, what is the largest total amount that may be applied today?
Correct answer: C - 12 fl oz for the entire lawn
A crop was treated 48 hours ago. Its pesticide label specifies a 24-hour restricted-entry interval and a 7-day preharvest interval. The employer has met the other worker-protection requirements, and no additional entry restrictions apply. For today's assignments, which pairing follows these intervals?
Correct answer: C - Hand weeding: permitted. Harvesting: prohibited.
In oral toxicity tests using the same test species and conditions, Formulation R has an LD50 of 180 mg/kg and Formulation S has an LD50 of 2,400 mg/kg. A crew leader concludes that S can be handled with fewer precautions. What do these results actually establish?
Correct answer: B - S has lower acute oral toxicity; handling risk also depends on exposure.
Minutes after an organophosphate insecticide leaks onto a handler's clothing, the handler develops profuse salivation, pinpoint pupils, muscle twitching, and labored breathing. A coworker has moved the handler away from the leaking equipment. What is the immediate priority?
Correct answer: C - Call 911 and start decontamination without exposing the rescuers.
A proposed treatment site has coarse, sandy soil, little organic matter, and shallow groundwater. The pesticide being considered is persistent, highly water-soluble, and weakly adsorbed to soil. When comparing labeled alternatives for this site, which movement pathway deserves the greatest attention?
Correct answer: A - Leaching of dissolved pesticide down toward groundwater
Several unrelated ornamental species develop the same leaf scorch, and the damage stops exactly at the boundary of a pesticide application made the previous day. Comparable plants outside the treated strip are healthy, and inspection finds no pest organisms or signs of infection. Before selecting another pesticide, which possible cause deserves first attention?
Correct answer: A - Noninfectious injury from the pesticide application
A contractor proposes alternating two insecticides to delay resistance. The products have different brand names but the same mode of action. Monitoring and sanitation are already part of the program. All replacement products under consideration are effective and labeled for the site and pest. Which revision would create a meaningful mode-of-action rotation?
Correct answer: B - Select an effective, different mode of action and retain the nonchemical controls.
During a clean-water check at the same verified pressure, a new nozzle delivers 0.40 gallon per minute, nozzle 1 delivers 0.30, and nozzle 2 delivers 0.46. All other identical nozzles deliver 0.39-0.41 gallon per minute. OSU Extension recommends replacing a nozzle when its flow exceeds that of a new identical nozzle by more than 10%. Which correction addresses both abnormal readings without changing the output of the sound nozzles?
Correct answer: D - Check nozzle 1 for blockage; replace nozzle 2 and retest.
Before a dawn application, smoke from a distant burn remains in a thin horizontal layer just above the field. Winds are almost calm, and air several feet above the ground is warmer than air near the surface. What do these observations mean for the application?
Correct answer: D - Vertical mixing is limited; wait for the inversion to dissipate before spraying.
An Oklahoma applicator holds a current certification in the category needed for lawn treatments. The applicator is not employed by a licensed pesticide business and plans to charge neighbors for applications of general-use pesticides. Which authorization is still needed before offering those services?
Correct answer: A - An Oklahoma commercial pesticide applicator license for the business
The OK-PEST exam also covers these domains. Drill them in the full free practice test:
The full bank has 1,020 more OK-PEST questions with explanations.
Continue in the free practice test →
View plans