Algonquin Park - Seasonal Tips Blackflies and Mosquitos Spring is the season of Blackflies and Mosquitos. The worst time of day for blackflies tends to be the last 2 or 3 hours of sunlight. Mosquitos are most often a problem in cooler, shady parts of the forest, as well as in the evening, and into the first couple of hours of darkness. White, tan, khaki, etc. are preferable.
Evidence exists that something in garlic acts as a repellant.
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