Abstract
Pruning stubs on grapevine cordons, inoculated in 1975 with mycelial cultures of E. armeniacae, P. viticola or plain agar, were harvested in 1980. Symptom expression and reisolation of the pathogens confirm that only E. armeniacea is capable of inducing the pruning wound cankers and chlorotic, stunted spring foliage that have historically been associated with dead arm disease of grape, previously attributed to P. viticola in North America.

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