Make your roof last longer. Mold will attach to and push up the granules on your shingles. When cleaning the gutters and getting the leaves and needles off the roof, now is the time to use a weed sprayer with a 50/50 solution of bleach and water to kill it. Take care to not breath the airborne spray. A good organic breather mask is recommended. The mold should turn color or you didn’t really attack it completely. Within a day, it will dry up. If it is still soft, up the beach in your solution.

Unfortunately, the white mold spots tend to lift off granules and there will be a black spot as shown below. But better to get the mold as soon as possible before it grows larger and creates more damage.