I noticed the leaves on our lemon tree are covered in very small black spots. It looks similar to pictures I have seen online but the dots are smaller than e.g. the photos I have seen for the "Guignardia Citricarpa" fungus so I was curious.
The tree is a Meyer lemon tree. We live in San Francisco so temperatures range from low 40's at night to high 70's and humidity is around 35-55 percent.
Thanks for your help, Kevin