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These 10 free MO-PEST questions are organized by exam domain, so you can see how each part of the Missouri General Standards of Competence (CORE) Examination blueprint is tested. Reveal the answer and explanation under each question.
A pesticide label states, "For best results, apply before 9 a.m." It also states, "Do not apply when wind exceeds 10 mph." At 1 p.m., wind is steady at 6 mph, no inversion is present, and every other label condition is met. How should the applicator treat the two statements?
Correct answer: C - Proceed; the morning statement is advisory
A pesticide has an oral LD50 of 900 mg/kg, a dermal LD50 of 4,000 mg/kg, an inhalation LC50 of 5 mg/L, moderate skin irritation at 72 hours, and corrosive eye effects. Determine the required front-panel marking from the most severe acute endpoint.
Correct answer: C - DANGER without POISON or the skull-and-crossbones
During mixing, pesticide concentrate splashes onto an applicator. Within minutes, he develops pinpoint pupils, profuse salivation, muscle twitching, and increasing difficulty breathing. The coworker's first priority is to:
Correct answer: A - Call 911, stop exposure safely, and decontaminate as labeled
At sunrise, an applicator sees chimney smoke spread sideways in a flat layer. Wind at boom height is 1 mph, below the label maximum, and a sensitive vineyard lies downwind. This pattern is a warning to:
Correct answer: C - Postpone until the inversion ends and spray can remain on target
After a herbicide application, three unrelated plant species develop the same chlorosis and necrosis. The injury forms sharp bands matching sprayer overlap, and no insects, spores, webbing, or other pest signs are present. The evidence points most strongly to:
Correct answer: B - Abiotic herbicide injury associated with sprayer overlap
A nursery uses a small hydraulic spray tank with no continuous agitation system. Four formulations are labeled and effective for the same site and pest. Identify the formulation least likely to become nonuniform after mixing with water.
Correct answer: B - SL, because the active ingredient forms a true solution
Using the 1/128-acre method at 20-inch nozzle spacing, a sprayer travels the required 204-foot course. Five nozzles collect 19, 20, 20, 20, and 21 fluid ounces. The target is 20 GPA, and the manufacturer's acceptance band is plus or minus 10% from target. What do these results support?
Correct answer: D - Proceed; the average and individual outputs are within tolerance
Rows are 36 inches apart, and a 12-inch band will be treated across a 60-acre field. The label rate is 3 pounds of product per treated acre. Calculate the amount of product needed.
Correct answer: A - 60 lb, based on 20 treated acres
A Missouri commercial applicator performs an indoor crack-and-crevice treatment with a general-use pesticide. Under the state's application-record rule, the applicator must:
Correct answer: D - Record it within 3 business days and retain it 3 years; treated-area size is excepted
A noncertified employee is assigned a turf application. His supervisor is certified in the turf category, and both work for the same company from the same branch. Before departure, the supervisor provides use-specific instructions, complete labeling, clean required PPE, a compliant work order, and a sprayer inspected that morning. The label does not require physical presence. The supervisor remains reachable by phone and can respond in person. Can the employee begin?
Correct answer: A - Yes; continuous on-site presence is not required under these facts
The MO-PEST exam also covers these domains. Drill them in the full free practice test:
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