Stem Rot of English Ivy Caused by Phytophthora cinnamomi

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

Research in Plant Disease 2007;13(3):207-210.
Published online December 30, 2007.

Phytophthora cinnamomi에 의한 아이비줄기썩음병

김형무, 진교훈, 고정애

Stem Rot of English Ivy Caused by Phytophthora cinnamomi

Hyung Moo Kim, Kyo Hoon Jin, Jung Ae Ko

Abstract

A stem and root rot disease of English ivy (Hedera helix) was found in the flower market, Jeonju, Chonbuk province, Korea in May 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 cinnamomi. The fungus produce ovoid sporangium which was ovoid to spherical and obpyriform which is noncaducous, nonpapillate and averaged 33.8×16 μm in dimension. Chlamydospores were abundantly produced on agar media and sized about 19.7 μm in diameter. The fungus was heterothallic and A1 mating type. Oospores were measured 26.2 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. cinnamomi in Korea.

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