black spot

Hi outdoor gardener in southern california. I am having a hard time finding out what is attacking my plants. looks like black mildew. attacks the fan leaves with black spots then travels along the stem until it reaches the buds and is halted by the trichomes but slowly makes its way on them...

Hi. Im growing some plants outdoors. Some of my trees are getting unhealthy and theyre starting to get these tiny black/purple spots on them and it's spreading pretty fast. My healthy trees don't have any of it tho. Any idea what this is? I recently found out that my soil has been infested with...