First Report of Diplodia Canker of Cypress Caused by Diplodia pinea f. sp. cupressi on Mediterranean Cypress in Tunisia

Plant Disease
M IntiniD Smith

Abstract

Symptoms of decline were observed on Mediterranean cypress trees (Cupressus sempervirens L.) in Tunisia in 2003 and 2004; disease specimens were vouchered as FIAF 38649. The declining, windbreak trees in the Cap Bon Region were 25 to 30 years old. Severity of symptoms varied among trees. Thus, areas of reddish, withered foliage alternated with areas that were still green. Other trees were completely withered. The bases of withered branches and tree trunks bore slightly sunken cankers with longitudinal bark cracks that oozed drops of resin. When the outer layer of a cankered area was scraped away, dark brown inner bark tissue was seen to extend up to several centimeters around the canker. Cross sections through cankers on trunks and branches revealed extensive darkened, wedge-shaped sectors in the wood. The affected bark bore numerous black pycnidia. Conidia were mostly smooth, ovoid, hyaline, and aseptate; a few were brown with a medial septum. The mean conidial dimensions (n = 100) were 27 × 11 μm; the extreme range was 19 to 31 × 8 to 13 μm. Isolates obtained from affected host tissue and conidia developed mainly floccose colonies that were white, then greyish green, and finally dark gray black on potato dextrose agar (PDA) a...Continue Reading

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