Rudbeckia psyllid nymphs cause large, purple raised blotches on the foliage of Rudbeckia. Look on the underside of the leaves for the bright red and white insect that resembles a leafhopper. Nymphs feed by inserting their needle-like mouthparts into lower surfaces of the leaf and sucking out plant juices. This feeding causes a distinct, shallow depression on the lower leaf surface and purplish spots. It has been found in Ohio, NY, NJ and CT.