Quick answer: Alternaria leaf spot is a common fungal disease caused primarily by Alternaria alternata. It affects many crop species, particularly ...

Quick answer: Cercospora leaf spot is a fungal disease that shows up as small tan-to-brown spots with a reddish-purple border; as the spots age, th...

Quick answer: Plant rust is a fungal disease that shows up as powdery reddish, orange, or yellow pustules — usually on the undersides of leaves, of...

Quick answer: Aster yellows is a common plant disease caused by an organism lacking cell walls and spread by aster leafhoppers. It affects many pla...