NWCO - Nuisance Wildlife Control Operator Nuisance Wildlife Control Operator Chemical Control Methods 1 — Questions and Answers
Question 1: Which fumigant is commonly used by NWCOs to control ground squirrels and prairie dogs by introducing gas into burrow systems?
- Carbon tetrachloride
- Aluminum phosphide (Correct answer)
- Sodium fluoroacetate (1080)
- Zinc phosphide dust
Correct answer: Aluminum phosphide
Aluminum phosphide reacts with moisture in the soil and burrow air to produce phosphine gas, which is lethal to burrowing rodents. It is a restricted-use pesticide requiring a license and can only be applied by certified applicators.
Question 2: What does the signal word 'DANGER' on a pesticide label indicate about the product?
- The product is a restricted-use pesticide requiring special licensing
- The product is highly toxic — a few drops to a teaspoon can be fatal to an adult (Correct answer)
- The product poses a moderate hazard requiring protective eyewear only
- The product is banned for residential use but approved for agricultural settings
Correct answer: The product is highly toxic — a few drops to a teaspoon can be fatal to an adult
Signal words on EPA-registered labels rank toxicity: DANGER (highest toxicity — LD50 very low), WARNING (moderate toxicity), and CAUTION (lowest toxicity among labeled products). DANGER indicates that a very small amount can be lethal to humans.
Question 3: Zinc phosphide is classified as which type of chemical control tool in wildlife damage management?
- Tracking powder
- Acute rodenticide (Correct answer)
- Chronic anticoagulant
- Repellent toxicant
Correct answer: Acute rodenticide
Zinc phosphide is an acute rodenticide — it kills rapidly after a single feeding, typically within hours, by releasing phosphine gas in the stomach. This distinguishes it from chronic rodenticides like anticoagulants, which require multiple feedings over several days.
Question 4: Which of the following is a primary safety concern when applying pesticides near water bodies during wildlife damage management?
- UV degradation making the pesticide ineffective within 24 hours
- Runoff or leaching contaminating aquatic ecosystems and violating the Clean Water Act (Correct answer)
- Attracting non-target waterfowl to the treated area
- Reducing soil pH and limiting pesticide absorption by target species
Correct answer: Runoff or leaching contaminating aquatic ecosystems and violating the Clean Water Act
Pesticide runoff into surface water can kill non-target aquatic organisms and constitutes a violation of both pesticide label directions (which are federal law under FIFRA) and the Clean Water Act. NWCOs must follow label buffer zone requirements near water.
Question 5: What is the purpose of a tracking powder in chemical wildlife control?
- To repel target animals from a specific zone using scent aversion
- To deliver a toxicant to animals that self-groom or transfer powder through contact (Correct answer)
- To mark burrow entrances so operators can identify active runs
- To neutralize secondary poisoning risk by binding to fur rather than being ingested
Correct answer: To deliver a toxicant to animals that self-groom or transfer powder through contact
Tracking powders are pesticide formulations applied in runways, burrows, or tight spaces where the target animal walks through and picks up the powder on its feet or fur, then ingests it during grooming. This delivery method reaches rodents that may avoid bait stations.
Question 6: Under EPA regulations, what is required before an NWCO may legally apply a Restricted Use Pesticide (RUP)?
- Written permission from the property owner only
- Certification as a licensed pesticide applicator in the appropriate category (Correct answer)
- Notification to the local fire department at least 48 hours in advance
- A co-signature from a licensed veterinarian confirming no domestic animals are present
Correct answer: Certification as a licensed pesticide applicator in the appropriate category
Restricted Use Pesticides may only be purchased and applied by certified applicators or persons under their direct supervision, as established by FIFRA. States administer applicator certification programs, and NWCOs must hold the appropriate category license before using RUPs.
NWCO - Nuisance Wildlife Control Operator Nuisance Wildlife Control Operator Chemical Control Methods 1
Which fumigant is commonly used by NWCOs to control ground squirrels and prairie dogs by introducing gas into burrow systems?