Stem Rot of English Ivy Caused by Phytophthora nicotianae

Kim, Hyung Moo; Jin, Kyo Hoon; Ko, Jung Ae

Research in Plant Disease 2008;14(2):122-126.
Published online August 30, 2008.

Phytophthora nicotianae에 의한 아이비줄기썩음병

김형무, 진교훈, 고정애

Stem Rot of English Ivy Caused by Phytophthora nicotianae

Hyung Moo Kim, Kyo Hoon Jin, Jung Ae Ko

Abstract

A stem and leaf rot disease of English ivy (Hedera helix) was found in the flower market, Jeonju, Chonbuk province, Korea in July 2007. A Phytophthora species was isolated from the diseased part of the plant. Based on the mycological properties and pathogenesis the isolate was identified as Phytophthora nicotianae. The fungus produce ovoid sporangium which was ovoid to spherical which is noncaducous, papillate and averaged 35.4×25.2 μm in dimension. Chlamydospores were abundantly produced on agar media and sized about 28.5 μm in diameter. The fungus was heterothallic and A1 mating type. Oospores were measured 23.3 μm in size. Optimum temperature for growth of the fungus was 25 to 30oC. Up to our knowledge, this is the first report demonstrating the stem rot on English ivy caused by P. nicotianae in Korea.

Key Words: English ivy, Hedera helix, Phytophthora nicotianae, Stem rot