Master Gardener Tips September 14, 2023

By Kirstee Schutte, Nebraska Extension Master Gardener

Signal words are terms that appear on every pesticide label to denote the relative acute toxicity of the product to humans. Pesticides labeled DANGER – POISON are in hazard class 1 and are considered highly toxic. Pesticides labeled DANGER are also hazard class 1 and highly toxic, but they are based on the corrosive properties of the product. Pesticides labeled WARNING are in hazard class 2 and are considered moderately toxic. Pesticides labeled CAUTION are in hazard class 3 and considered slightly toxic.

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