Signs of rusts include bright yellow, orange, reddish-brown, or chocolate-brown raised pustules visible on the undersides of the leaves. Gelatinous tendrils of rust spores are produced from galls each spring on eastern red cedar infected with cedar-apple rust. Pine needle rust produces pustules on pine during spring. Early symptoms on leaves are yellow leaf spots. Rust galls may appear on stems of pine, cedar, and hawthorn. Twig rust may cause branch dieback on plants as diverse as hawthorn and hemlock. Daylily rust was first found in the U.S. in 2000 and in Tennessee in 2001.

Use cedar rust resistant cultivars for apple, crabapple, and hawthorn.

For chemical control recommendations, consult the Insect and Plant Disease Control Manual, UT Extension Publication 1690, found here. Please contact your local Extension office for specific pesticide recommendations.