Ontario Pesticide Exam overview

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.

  • 14 questions
  • Topic drill
0/14
Structural extermination rules · Question 1Score 0/0

Which licence class is needed to apply termiticides to prevent or control termites?

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.

  1. Which licence class is needed to apply termiticides to prevent or control termites?

    1. Landscape class
    2. Structural class
    3. Fumigation Soil class
    4. Termite class
  2. What record is required when using zinc phosphide bait in a structure?

    1. The client's signature on each bait station
    2. A photo of each dead rodent, kept one month
    3. A daily weather log for the treatment period
    4. A record of every bait location, kept two years
  3. Before releasing a Class B suspension in air in a building, what must be done?

    1. Tell occupants to stay on the upper floor with windows closed
    2. Lock other doors, post Sign B and clear people and animals
    3. Leave all doors open so the space ventilates during the treatment
    4. Post Sign G on the front door and let occupants stay in other rooms
  4. During a strychnine baiting job, how often must dead animals be removed?

    1. Daily
    2. Only if they smell
    3. At the end of the job
    4. Weekly
  5. A landlord wants to treat a tenant's unit with a Class D insecticide. What does the regulation say?

    1. The landlord may do it in any unit they own
    2. Only the occupant may do it without a licence
    3. The landlord may do it with the tenant's consent
    4. Anyone may use Class D products in a rental
  6. What staffing is required for a structural treatment with a Class B suspension in air?

    1. The building owner must stay inside
    2. Only one exterminator, working alone
    3. A technician must stand guard outside the main entrance
    4. A second licensed exterminator must be present
  7. When is a fumigation considered complete?

    1. When the doors have been open for at least one hour
    2. When the exterminator can no longer smell the gas
    3. When the fumigant has been released for the full exposure time on the label
    4. When airing out brings gas below label and regulation limits
  8. For an indoor fumigation with a Class B fumigant gas, when must written notice be delivered?

    1. Within 7 days after the fumigation ends
    2. At least 24 hours and no more than 7 days before
    3. Only on the morning of the fumigation
    4. At least 30 days before the fumigation, by registered mail
  9. Which sign is posted at all entrances during a fumigation?

    1. Sign G (Pesticide storage)
    2. Sign A (Warning — Fumigation)
    3. Sign C (Residential land notice)
    4. Sign B (Structural extermination)
  10. Which pests does the Structural class NOT cover?

    1. Pests of plants
    2. Bed bugs in an apartment
    3. Cockroaches in a restaurant
    4. Rodents in a warehouse
  11. Which products may a Structural-class exterminator NOT use?

    1. Rodenticides
    2. Insecticidal baits
    3. Herbicides
    4. Insecticidal dusts
  12. You use a zinc phosphide bait in a building. Where must it be placed?

    1. Where people and non-target animals cannot reach it
    2. On kitchen counters near food the rats eat
    3. Along open floors where the rats travel freely
    4. In the open, so clients can see it is working
  13. How is a land extermination done with a fumigant gas treated under the regulation?

    1. It is deemed to be a structural extermination
    2. It needs no licence if done outdoors
    3. It is deemed to be a water extermination
    4. It is treated as a cosmetic use
  14. Which structural treatment can be done without an exterminator licence?

    1. A Class D product with only diatomaceous earth
    2. A Class B suspension in air in a warehouse
    3. A Class C residual spray in a restaurant
    4. 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

Full practice tests