This is an INFESTATION that has reached EPIDEMIC proportions, caused by, but not limited to, a very hardy stain of ALGAE , specifically, a blue-green cyanobacteria, and its technical name is Gloeocapsa Magma.

This ALGAE is GROWING, it is ALIVE and continually   HUNGRY,  

It really is a roof munching "miniature plant", that prefers and feeds on the fillers and inert materials that comprise the manufacture of asphalt roofing shingles.

Mark my words, coming from TWO DECADESof EXPERIENCE,  

as a concerned property owner, you want to  safely clean your roof with  non pressure methods as soon as you notice black streaks and staining start to. Ceramic Granule Loss and Shingle Degredation begins to radidly occur as the root system, tugs and puls and entertwines around the protectant UV protectors in the roofing material opening up microspopic void in the roof surface where moisture and the suns beating rays then dry out the shingle cuasing it to crack and curl.

 It is very important to safely and professionally clean your roof SOONER rather then LATER. 

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