Abstract

Keim, Randolph, L.J. Klure, and G.A. Zentmyer. 1981. A foliage blight of euonymus caused by Phytophthora. California Agriculture 35(5 & 6): 16-17.

Euonymus is popularly recognized for its colorful and generally variegated foliage that differs greatly from one cultivar to another. Several cultivars were tested for susceptibility to Phytophthora. The disease was first detected on ‘Goldspot’ by the senior author, and three isolates were subsequently taken from three separate ‘Goldspot’ plantings at different locations. Typically, in a large production nursery the first indications of the disease are dead terminal shoots, which must be pruned away before affected plants can be marketed. The dry, dead shoots are usually observed two to several weeks after a rain, but early stages of the disease can be detected by careful inspection soon after favorable weather conditions for infection occur. To help control collar rot of rooted cuttings, it is important to take cuttings only from disease-free mother plants grown without overhead irrigation and treated regularly with suitable fungicides to ensure a disease-free condition.

• © 1982, International Society of Arboriculture. All rights reserved.