Phytophthora erythroseptica에 의한 감자 홍색부패병 발생 = First Report of Pink Rot of Potato (Solanum tuberosum) Caused by Phytophthora erythroseptica in Korea

다국어 초록 (Multilingual Abstract)

Pink rot of potato (Solanum tuberosum L.) occurred at Pyeongchang in Gangwon and at Bosung in Junnam
province since 1999. The disease incidence in the surveyed areas was about 5% of harvested potatoes in 2002.
Affected tubers showed a dull brown appearance and the lenticels and eyes on tubers turned dark brown. The
cut surface of the diseased tuber colored faint pink and the entire surface of the diseased tuber becomes deep
salmon pink within 30 min. The pathogen isolated from the diseased tubers was identified as Phytophthora
erythroseptica based on morphological and cultural characteristics. Mycelial mat was fairly fluffy, rosette or
stellate patterns and rounded or angular hyphal swellings were formed in water. Temperature for mycelial
growth was ranged from 5 to 30oC and optimal temperature was 25oC. Non-papillate sporangia were persistent
on stalk and ellipsoid, ovoid, obpyriform or distorted in shape, often with a constriction distal in the middle.
Size of sporangia was 41.3~69.6×26.8~47.4 (av. 55.5 ×37.1) mm. Sexuality of Phytophthora erythroseptica
was homothallic. Oogonia were 30~46 mm in diameter and oospores were 28~35 mm in diameter. Elongated or
cyclindrical antheridia were all amphigynous. This is the first report on potato pink rot caused by Phytophthora
erythroseptica in Korea.