Could Be:

#1)Spider mites--microscopic pests-- shake a leaf over a piece of white paperto see if anything moving falls off; also look for thin webbing on the foliage...

#2)Rust-a fungus that spreads in moist air, wind and moderate temps. Gets severe in cool humid climates...

Maybe these two suggestions will help you find some info and pictures to help...

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PlantFaerie don't water the leaves when you water as this can also cause yellow leaves and brown/black spot. Black spot is a fungus when you pick affected leaves DO NOT throw them on hte ground as if it is black spot can get into the soil put the leaves in your garbage that way it gets completely away from your flowers. I will rinse leaves off with a strong stream if I find aphids but do it when it is cool as if hot will burn the leaves and cause a steam room effect.
Hope this helps.

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