Project Description

Cedar Apple Rust Gall on Juniper

Seen on junipers and Eastern redcedars and transmitted to them from nearby apples and crabapples. Causes tan to brownish round to kidney-shaped fungal galls. With moist weather, gaudy bright orange masses of gelatinous spores develop from these galls, and galls swell to several times their original size. Spore masses are several inches in diameter, with a central core and radiating hornlike tendrils, and are highly visible during moist weather in mid-spring. Galls may be pruned out, but no spray treatment is effective.