Morning Glory (blue flowers/wild/grown from last season's seeds);planted in...
Morning Glory (blue flowers/wild/grown from last season's seeds);planted in whiskey barrel, w/ trellis;substance discovered today July 23; substance affects back side of lower leaves which have powdery orange bumps; plant grows in full sun; no pesticide applied; no fertilizer applied in 4 weeks time. QUESTION IS: what is the orange substance, is it contagious to surrounding plants, what should I do?
This looks like a rust disease on your morning glory foliage.
This is host specific and will not affect your other plants . At this point, pick off the affected leaves or cut back. It is also possible they may get infected later in the season. See our website for more information and management http://extension.umd.edu/hgic/rust-flowers