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Oregon Pesticide Applicators Practice
Exam Questions and Answers (Verified
Answers) Plus Rationales 2025
- Which agency administers pesticide laws and regulations in Oregon? A. EPA B. OSHA C. Oregon Department of Agriculture (ODA) D. USDA The ODA is the lead regulatory agency for pesticide use in Oregon.
- What is the primary purpose of the pesticide label? A. To advertise the product B. To provide legal and safety information C. To promote brand loyalty D. To explain weather conditions The label is a legal document that instructs safe and proper use of the pesticide.
- What is the "signal word" on a pesticide label used for? A. Indicating the product's toxicity level B. Showing mixing directions C. Telling you the active ingredient
D. Marking expiration date Signal words such as "Danger", "Warning", or "Caution" reflect the relative toxicity of the product.
- Which signal word represents the highest toxicity? A. Caution B. Warning C. Danger D. Alert "Danger" indicates the pesticide is highly toxic or corrosive.
- How often must Oregon pesticide applicators renew their license? A. Every year B. Every three years C. Every five years D. Every ten years Licenses must be renewed every 5 years with required continuing education.
- Which of the following is considered a restricted-use pesticide (RUP)? A. Glyphosate B. Neem oil C. Paraquat D. Horticultural oil Paraquat is highly toxic and regulated as a restricted-use pesticide.
- What personal protective equipment (PPE) is always required when mixing pesticides? A. Safety vest
The REI is the legal wait time after application before workers can reenter safely. 11.Which type of pesticide formulation is most prone to drift? A. Granules B. Dust C. Emulsifiable concentrates D. Wettable powders ECs produce fine particles that easily become airborne. 12.What is back-siphoning? A. Spraying backward B. Contamination of water due to reversed flow C. Using a siphon for mixing D. Overflowing a tank Back-siphoning occurs when pesticide solution flows back into the water source. 13.The best way to avoid back-siphoning is: A. Use a longer hose B. Use an anti-siphon device C. Mix manually D. Use more pressure An anti-siphon valve or air gap prevents pesticide from flowing backward. 14.Pesticides should be stored: A. In food-grade containers B. With animal feed
C. In a secure, labeled, and ventilated area D. In open containers Storage must be secure, labeled, and ventilated to avoid contamination and exposure. 15.What is the minimum number of hours of continuing education required over five years in Oregon? A. 8 B. 40 C. 60 D. 100 You need 40 hours of approved CEUs within five years to renew your license. 16.Which pesticide formulation contains a dry active ingredient in small pellets? A. EC B. WP C. SC D. G G stands for granules, a dry formulation used for soil treatment. 17.What does "systemic" mean regarding a pesticide? A. Only contact kills B. Absorbed into the plant and transported internally C. Only affects the outer surface D. Binds with soil Systemic pesticides move through the plant's tissues to affect pests.
D. Pesticide spoilage Phytotoxicity is plant injury due to improper pesticide use. 22.Which document lists emergency treatment procedures for pesticide exposure? A. SDS B. WPS C. Pesticide label and SDS D. MSDS Both the label and SDS (Safety Data Sheet) contain emergency information. 23.If pesticide exposure occurs through skin contact, you should first: A. Call 911 B. Apply lotion C. Remove contaminated clothing and wash skin D. Use alcohol wipes Immediate washing with water minimizes absorption through the skin. 24.Drift can be reduced by: A. Using high pressure B. Spraying during calm winds C. Spraying at noon D. Increasing nozzle size Spraying during low wind periods reduces the risk of drift. 25.What type of nozzle is best for minimizing drift? A. Hollow cone B. Low-drift flat fan
C. Flood nozzle D. Jet nozzle Low-drift nozzles produce larger droplets that are less likely to drift. 26.How long should pesticide application records be kept in Oregon? A. 6 months B. 1 year C. 3 years D. 5 years ODA requires records to be maintained for at least three years. 27.What is the primary concern when using pesticides near water? A. Crop yield B. Contamination of aquatic life and drinking water C. Soil compaction D. Noise Pesticides near water can harm aquatic life and contaminate water sources. 28.Pesticide containers should be rinsed: A. After every second use B. Only when convenient C. Immediately after use (triple-rinsed) D. Once a week Triple-rinsing removes residue and makes containers safe for disposal. 29.What is the term for a pest developing resistance to a pesticide? A. Tolerance B. Immunity
33.Which part of the label tells you how to mix the product? A. Signal word B. REI C. Directions for Use D. Precautionary Statement "Directions for Use" includes mixing, application, and restrictions. 34.What should be done before reusing a pesticide container? A. Wash with detergent B. Never reuse pesticide containers C. Store upside down D. Keep in shade Pesticide containers must not be reused unless specifically approved. 35.Which of these is a characteristic of emulsifiable concentrates (ECs)? A. Solid granules B. May cause phytotoxicity and are flammable C. Always water-based D. Odorless ECs can be flammable and more toxic due to solvents used. 36.The term "inert ingredient" means: A. Non-toxic B. Not active against pests C. Water D. Harmful Inert ingredients are not intended to affect the pest directly.
37.Pesticide resistance can be prevented by: A. Applying more pesticide B. Using one chemical class C. Rotating pesticide classes D. Using the most toxic chemical Alternating chemical classes helps slow resistance development. 38.Drift is more likely when: A. Humidity is high B. Wind speed is high C. Wind speed is zero D. Nozzles are low High winds can carry pesticide particles away from the target. 39.The label says "Do not apply within 25 feet of water." This is an example of: A. Recommendation B. Buffer zone C. Mandatory label requirement D. Suggestion This is a legal requirement to protect water bodies. 40.What is a common symptom of pesticide poisoning? A. Chest pain B. Nosebleed C. Headache and nausea D. Broken bones Symptoms often include nausea, dizziness, and headaches.
The applicator is responsible for following label directions and applying pesticides safely. 45.What is a spot treatment? A. Treating a whole field B. Treating small, targeted areas C. Treating once a month D. Treating edges only Spot treatment limits exposure and reduces pesticide use. 46.PPE must be: A. Optional B. Worn as stated on the label C. Avoided if it’s hot D. Used only for dust Label instructions dictate PPE for safe handling. 47.Pesticide containers should be disposed of by: A. Burning B. Following label and local regulations C. Burying D. Throwing in trash Proper disposal is regulated to prevent contamination. 48.What is the best time to apply pesticides to minimize impact on pollinators? A. Noon B. Early morning or late evening
C. During bloom D. During harvest Pollinators are less active early and late in the day. 49.Which pesticide exposure route is the most common? A. Inhalation B. Dermal (skin) C. Ingestion D. Ocular Most pesticide exposure occurs through the skin. 50.What is the buffer zone? A. Where mixing takes place B. Area left untreated to protect sensitive sites C. Area that is always sprayed D. A backup supply Buffer zones are required to reduce off-target pesticide impact.
