Which licence class is needed to apply termiticides to prevent or control termites?
Ontario Pesticide Exam: Structural extermination rules
What the Structural and Termite licences allow, Class D exemptions and rental units, special rodenticide rules, suspensions in air and Sign B, fumigation notices, airing out and Sign A.
- No sign-up
- Every answer explained
- Independent · not a government site
- 14 questions
- Topic drill
Study reference: Ontario Pesticides Act, O. Reg. 63/09, OPT&C and Health Canada (Oct 2026), Ch. 8 Structural extermination rules — O. Reg. 63/09 ss. 51–67.1; OPT&C licence categories
All 14 questions in this test
Every question and its answer choices. The correct answers and explanations appear when you take the test above.
Which licence class is needed to apply termiticides to prevent or control termites?
- Landscape class
- Structural class
- Fumigation Soil class
- Termite class
What record is required when using zinc phosphide bait in a structure?
- The client's signature on each bait station
- A photo of each dead rodent, kept one month
- A daily weather log for the treatment period
- A record of every bait location, kept two years
Before releasing a Class B suspension in air in a building, what must be done?
- Tell occupants to stay on the upper floor with windows closed
- Lock other doors, post Sign B and clear people and animals
- Leave all doors open so the space ventilates during the treatment
- Post Sign G on the front door and let occupants stay in other rooms
During a strychnine baiting job, how often must dead animals be removed?
- Daily
- Only if they smell
- At the end of the job
- Weekly
A landlord wants to treat a tenant's unit with a Class D insecticide. What does the regulation say?
- The landlord may do it in any unit they own
- Only the occupant may do it without a licence
- The landlord may do it with the tenant's consent
- Anyone may use Class D products in a rental
What staffing is required for a structural treatment with a Class B suspension in air?
- The building owner must stay inside
- Only one exterminator, working alone
- A technician must stand guard outside the main entrance
- A second licensed exterminator must be present
When is a fumigation considered complete?
- When the doors have been open for at least one hour
- When the exterminator can no longer smell the gas
- When the fumigant has been released for the full exposure time on the label
- When airing out brings gas below label and regulation limits
For an indoor fumigation with a Class B fumigant gas, when must written notice be delivered?
- Within 7 days after the fumigation ends
- At least 24 hours and no more than 7 days before
- Only on the morning of the fumigation
- At least 30 days before the fumigation, by registered mail
Which sign is posted at all entrances during a fumigation?
- Sign G (Pesticide storage)
- Sign A (Warning — Fumigation)
- Sign C (Residential land notice)
- Sign B (Structural extermination)
Which pests does the Structural class NOT cover?
- Pests of plants
- Bed bugs in an apartment
- Cockroaches in a restaurant
- Rodents in a warehouse
Which products may a Structural-class exterminator NOT use?
- Rodenticides
- Insecticidal baits
- Herbicides
- Insecticidal dusts
You use a zinc phosphide bait in a building. Where must it be placed?
- Where people and non-target animals cannot reach it
- On kitchen counters near food the rats eat
- Along open floors where the rats travel freely
- In the open, so clients can see it is working
How is a land extermination done with a fumigant gas treated under the regulation?
- It is deemed to be a structural extermination
- It needs no licence if done outdoors
- It is deemed to be a water extermination
- It is treated as a cosmetic use
Which structural treatment can be done without an exterminator licence?
- A Class D product with only diatomaceous earth
- A Class B suspension in air in a warehouse
- A Class C residual spray in a restaurant
- A Class C rodenticide in a factory
Structural extermination rules: key rules to remember
Our summary of what the official handbook says on this topic, in our own words. Read it before or after the practice questions above, then check the original chapter. Read the official chapter ↗
Structural licence classes
- The Structural class may use all pesticides, including fumigants and suspensions in air, except Class B fumigant gases, chloropicrin, termiticides and herbicides.
- The Structural class covers any structural extermination except control of pests of plants.
- The Termite class uses termiticides (no fumigant gases or chloropicrin) to prevent or control termites.
- Greenhouse/Interior Plant covers pests of plants growing inside greenhouses and buildings.
- Fumigant gases are used under the fumigation classes; a land extermination done with a fumigant gas is deemed a structural extermination.
Exemptions
- No licence is needed for some Class D products: wood preservatives, tree wound dressings, enclosed insect bait stations, and, for structural work, products whose only active ingredient is soap, mineral oil or diatomaceous earth.
- People may use Class D pesticides in a structure they own or occupy (or their full-time employer's premises) without a licence.
- In a rental unit, only the occupant may use that exemption, so a landlord needs a licensed exterminator.
Rodenticides with strychnine, zinc phosphide or 4-aminopyridine
- Place the bait where people and non-target animals cannot reach it, away from food and drink.
- Dispose of dead animals daily so people and other animals cannot contact them.
- Remove the pesticide from every location when the job is complete.
- Record every placement location during the job and keep the record at least two years (operators keep a copy too).
Class B suspensions in air and labelled Class C fumigants
- Only licensed Structural, Termite, Greenhouse/Interior Plant or Fumigation Commodity exterminators may perform them, and a second licensed exterminator must be present.
- Before applying: lock all outside doors except the access door, post Sign B (Warning — Structural extermination) on all doors and make sure no people or animals are inside.
- After applying: lock the last door and keep everyone out until the air is clear, except emergency or authorized persons using respiratory protection and working in pairs.
Fumigation basics
- A fumigation is not complete until airing out brings the gas below both the label limit and the regulation's limit (for example 0.3 ppm for phosphine).
- For indoor Class B fumigant gas fumigations, written notice goes to the owner, adult occupants, neighbouring buildings, the medical officer of health, police and fire department at least 24 hours and not more than seven days before.
- Sign A (Warning — Fumigation) is posted at all entrances, buildings are locked and guarded, and the Director is told of completion within seven days.
Signs outdoors
- Structural exterminators treating land to control biting, stinging, venomous or disease-carrying arthropods must post land-extermination signs unless the area is under 1 m² or within 1 m of the structure.
Study the Structural extermination rules rules as flashcards →
Other topics
- Licences, certification and the examHow Ontario licenses vendors, exterminators and operators, the land, structural and water licence types, OPT&C certification, the two-part exam and licence rules.
- Pesticide classes and the lawWhat counts as a pesticide, federal product classes, Ontario Classes A to E, banned pesticides, using products only as labelled and the cosmetic pesticide ban.
- Technicians, trainees and supervisionWho technicians and trainees are, what they may not do, written instructions, weekly visits, the one-to-three supervision ratio and training records.
- Reading the pesticide labelThe principal and secondary display panels, registration numbers, signal words and symbols, first aid and toxicological information, restricted uses and the notice to user.
- Safe use, protective equipment and first aidProtective clothing, applying at the label rate, keeping people out and re-entry, indoor precautions, weather limits outdoors, washing up and poisoning first aid.
- Storage, vehicles and transportOriginal and secondary containers, storage area rules, Sign G, vehicles left unattended, fire department notices and keeping pesticides away from food and household goods in transport.
- Containers, spills and disposalTriple and jet rinsing, when a container is empty, recycling and disposal, damaged containers, protecting water sources and reporting spills and thefts to the Spills Action Centre.
- Insect pests and integrated pest managementIdentifying and controlling cockroaches, carpenter ants, bed bugs, fleas and wasps with sanitation, exclusion, monitoring and correctly used pesticides.
- Rats and miceIdentifying house mice, deer mice and rats, signs of infestation, rodent-proofing, trapping, bait stations and rodenticides, safe cleanup and the regulation's rules for acute rodenticides.
- Operating an extermination businessWho an operator may employ, the one-exterminator-per-three rule, duties to other staff, vehicle markers, insurance amounts and licence renewal.