First Report of Botryosphaeria ribis as a Branch Dieback Pathogen of Olive Trees in Spain

Plant Disease
M A RomeroA Trapero

Abstract

Botryosphaeria spp. are known to produce cankers and dieback in several woody hosts. Since 2001, a severe disease resulting in the dieback of branches was observed in olive (Olea europaea) orchards in Andalucía, southern Spain, where the only cultivar affected was Gordal de Sevilla. The affected trees showed abundant dead twigs, and wilted leaves remained attached. These symptoms were similar to those caused by Resseliella oleisuga, a bark borer insect common in the region. Closer inspection showed no evidence of insects, but revealed reddish brown bark lesions that girdled the affected branches. When the outer bark was removed, the affected tissue appeared dark brown, in contrast to the yellowish green of healthy inner bark. A Fusicoccum sp. was consistently isolated from the necrotic bark. Conidia produced in black pycnidia were hyaline, aseptate, fusoid, with a truncate base averaging 19.9 × 6.7 μm, becoming pale brown with all cells the same color, and developing one or two septa when germinated. These characteristics conform to Fusicoccum ribis (1), the anamorph of B. ribis. Pathogenicity of two isolates from symptomatic branches was determined by stem inoculations of 4-year-old cv. Gordal de Sevilla grafted on wild olive ...Continue Reading

Citations

Feb 13, 2016·Journal of the Science of Food and Agriculture·Irwin R Donis-GonzálezDennis W Fulbright
Feb 1, 2013·Plant Disease·J R Úrbez-TorresW D Gubler
Oct 27, 2020·Plant Disease·Meagan van DykFrancois Halleen

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