Incidences of Leaf Spots and Blights on Kiwifruit in Korea

Jeong, In Ho; Lim, Myoung Taek; Kim, Gyung Hee; Han, Tae Woong; Kim, Hong Chul; Kim, Min Ji; Park, Hyun Su; Shin, Soon Ho; Hur, Jae Seoun; Shin, Jong Sup; Koh, Young Jin

doi:2008.24.2.125

Plant Pathol J > Volume 24(2); 2008 > Article

The Plant Pathology Journal 2008;24(2):125-130.
DOI: https://doi.org/10.5423/PPJ.2008.24.2.125 Published online June 30, 2008.

Incidences of Leaf Spots and Blights on Kiwifruit in Korea

In Ho Jeong, Myoung Taek Lim, Gyung Hee Kim, Tae Woong Han, Hong Chul Kim, Min Ji Kim, Hyun Su Park, Soon Ho Shin, Jae Seoun Hur, Jong Sup Shin, Young Jin Koh

Abstract

Various kinds of leaf spots and blights were found in kiwifruit (Actinidia deliciosa) orchards on 2006 in Korea. Disease incidences were quite variable between open-field and rain-proof shelter. Rate of diseased leaves was recorded as about 70% at open-field orchards in late season but use of rain-proof vinyl shelters alleviated the disease incidences by 20%. Angular leaf spots appeared at early infection stage on June and several other symptoms were also recognized as the disease developed afterward. On September, brown leaf blights were the most frequent, followed by grayish brown ring spots, silvering gray leaf blights, zonate leaf blights, dark brown ring spots and angular leaf spots at openfield orchards. Four fungal species were frequently isolated from the disease symptoms. Phomopsis sp. was the most predominant fungus associated with the leaf spot and blight symptoms on kiwifruit, followed by Glomerella cingulata, Alternaria alternata and Pestalotiopsis sp. Phomopsis sp. was commonly isolated from angular leaf spots, silvering gray leaf blights, and zonate brown leaf blights. G. cingulata, A. alternata and Pestalotiopsis sp. were isolated from grayish brown ring spots (anthracnose), brown ring spots and zonate dark brown leaf blights. Typical symptoms appeared on the wounded and unwounded leaves, which were inoculated by each of Phomopsis sp., G. cingulata, and Pestalotiopsis sp., but A. alternata caused symptoms only on the wounded leaves.

Key Words: Alternaria alternata, Glomerella cingulata, kiwifruit, leaf spots and blights, Pestalotiopsis sp., Phomopsis sp.