Leaf spot diseases are caused by fungi that invade the leaf tissue causing it to turn brown or purplish, often with a concentric ring and perhaps a tiny centre spot. Mostly, leaf spot diseases are not READ MORE http://www.garden.ie/gardeningtroubles.aspx...
Even the most conscientious and hardworking gardener is likely to encounter leaf spot problems on trees and shrubs. The seemingly sudden appearance of brown or black blotches on leaves and defoliation READ MORE http://www.hort.uconn.edu/ipm/homegrnd/htms/27leafsp.htm