A manmade bacterial disease of grapes. It lives on but does not infect alfalfa, blackberries, cedar elm, grasses, red oaks, and willows. Leafhoppers are one of the main vectors. Management includes removal of host plants around vineyards and stimulation of beneficial microorganisms. This is stress problem caused by pushing the plants with too much fertilizer and pesticides. Pine tip blight: A pine disease that forms black bumps on the needles. It resembles pine tip moth damage and can be controlled with The Sick Tree Treatment.