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Subject: Phytophthora quercina causing oak decline in Asia
Date posted: April 11, 2002
Source: Plant Disease Notes, April 2002 (vol. 86 no. 4)
Phytophthora quercina was confirmed on several oak species in the Asian region of Turkey during a three year survey between 1999 and 2001. Affected trees exhibited symptoms of decline, slowly progressing towards tree mortality. Symptoms included thinning of the crown, yellowing and wilting of leaves, dieback of branches, and growth of epicormic shoots on branches and the main trunk. Phytophthora quercina, previously known only from Europe, is one of many Phytophthora species associated with oak decline in that region. In Europe, P. quercina is particularly pathogenic to young Quercus robur plants. In Turkey, this fungus was recorded from the new hosts Q. harswissiana, Q. frainetto, and the endemic species Q. vulcanica.