Dormant oil safety: it should not be applied when temperatures are below freezing.

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Study for the Maryland Pesticide Applicator Category 3: Ornamental and Turf Test. Test your knowledge with comprehensive questions. Each question is accompanied by hints and explanations to help you excel. Get exam-ready!

Multiple Choice

Dormant oil safety: it should not be applied when temperatures are below freezing.

Explanation:
Dormant oil safety hinges on the temperature when you apply it. The oil coats bark to smother overwintering pests, but if temperatures are below freezing, the film can cause or worsen tissue injury and the oil may not dry properly, increasing the risk of damage to the plant. Labels require applying only when temperatures are above freezing (often with a minimum around 40°F / 4°C and no forecast of freezing for the next 24 hours). So, it should not be applied when it’s below freezing.

Dormant oil safety hinges on the temperature when you apply it. The oil coats bark to smother overwintering pests, but if temperatures are below freezing, the film can cause or worsen tissue injury and the oil may not dry properly, increasing the risk of damage to the plant. Labels require applying only when temperatures are above freezing (often with a minimum around 40°F / 4°C and no forecast of freezing for the next 24 hours). So, it should not be applied when it’s below freezing.

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