please help me ive done a search and looked through the stickies certain stems of my friends plant are purple and fuzzy, hes really tempted to just cut them off but doesnt know what is happening, it also looks like other areas of the main stem are purple and certain parts of the base brown lines are climbing their way up.. hes been spraying with dutchmaster penetrator + zone special mix for powdery mildew, is that what it most likely is? should he cut branches off wherever he sees it? thanks