Damp, humid climates can encourage the growth of fungus on asphalt shingles. The result is unsightly green and black streaks that are especially noticeable on light-colored roofs.
But, there is hope! You can use shingles that are "fungus resistant." Shingles become fungus resistant by the addition of copper granules to the shingle surface.
The least expensive shingle that is currently available with fungus resistance is a 25 year, 3-Tab shingle.
To keep your shingles looking their best, use shingles that are fungus resistant.