Labels, Regulations, and Legal Requirements
The label is the law
In Ontario, pesticide use is governed by the provincial pesticide legislation and its regulation, with federal registration and classification under the federal pest control products law. Candidates must understand that the label is a legal document: the site, pest, rate, timing, application method, personal protective equipment, restricted-entry interval, storage and disposal directions are all binding. Using a product in a way not permitted by the label is an offence, and "the label did not say I could not" is never a defence.
Know the class system: Ontario classifies products, and the class determines who may purchase and use them and what training or authorization is required. Candidates should be able to state that some products are restricted to licensed applicators, that certain uses require additional qualifications, and that a vendor must confirm the purchaser's credentials. Traps: assuming a licence covers every class or every use; assuming a product registered elsewhere is legal here; and confusing the label rate with a "recommended" rate from a sales representative.
Records, intervals and responsibility
Learn the restricted-entry interval and pre-harvest interval concepts: the interval after application before workers may re-enter without protection, and before harvest. Understand that the applicator is responsible for compliance even when following an employer's instruction. Also know that a notice or posting requirement may apply before certain applications on sensitive sites.
Rule of thumb: if it is not on the label, do not do it; if the label is unclear, obtain the current label or advice before applying.
Worked example: a label permits application to turf but not to ornamental beds on the same property. Applying to the ornamental bed is a violation even though the product is registered and the rate is correct. The correct action is to select a product labelled for that site or decline the work.