Sang-Hyun Lee

Korea Forest Service

Ligustrum japonicum Thunb. (Oleaceae) is a hedge plant along streets in South Korea. In August 2019, leaf spots on trees were observed in Naju city of Jeonnam Province (35°00'32.4"N, 126°49'17.6"E). The number of diseased leaves on each affected tree within a 0.3-ha area was approximately 70%, which was observed from all the trees investigated. The...

During extensive surveys of phytopathogenic fungi in Korea, rust-infected leaves of Idesia polycarpa were found and deposited in the Korea University Herbarium. Seven of these samples were examined, and the fungus was identified as Melampsora idesiae on the basis of morphological characteristics. Analyses of the large subunit (LSU) rDNA region of t...

Paulownia coreana Uyeki is a deciduous tree indigenous to Korea (commonly called Korean paulownia) that has been extensively used in the wood industry and folk medicine (Kim et al. 2015). In September 2016, leaf spots were observed on dozens of P. coreana trees growing in a park in Kimcheon (36°07'05"N; 128°08'05"E), Korea. Symptoms on leaves devel...

Aucuba japonica Thunb. (Garryaceae) is native to rich forest soils in China, Korea, and Japan. Recently, it has been widely planted in gardens and parks for ornamental purposes. In July 2016, A. japonica ‘variegata’ was found damaged by a powdery mildew with approximately 10 to 30% disease incidence in a recreational park in Busan, southern Korea (...

In November 2009, a powdery mildew on glossy abelia (Abelia grandiflora) was found in Seogwipo, Jeju Island, Korea. Further survey in the southern part of Korea, e.g., Jeju, Busan, and Tongyeong confirmed occurrence of the disease. White colonies were present on leaves, young stems, and flowers, detracting from their beauty in landscape plantings....

Phytophthora katsurae is a fungal pathogen responsible for chestnut ink disease. We designed two duplex primer sets (SOPC 1F/1R+KatI 3F/5R, SOPC 1-1F/1-1R+KatI 3F/5R) to detect P. katsurae. SOPC 1F/1R and SOPC 1-1F/1-1R primer pairs were designed for sequence characteristic amplification regions (SCAR) marker, and KatI 3F/5R primer pair was used fo...

In early August of 2011, following a prolonged period of cool and moist weather, several trees of boxelder maple (Acer negundo) planted in Mt. Soyo located in Dongducheon, Korea, were found to be heavily damaged by premature defoliation with zonate leaf spot symptoms. Numerous number of cone-shaped, white sporophores (conidia) were observed on lesi...

The presence of Pleochaeta shiraiana associated with powdery mildew of Celtis sinensis in Korea is dubious, mainly due to incomplete records of earlier workers. To confirm the occurrence of the powdery mildew and the identity of the causal fungus, morphological characteristics of the anamorph and teleomorph from nine samples deposited in KUS (Herba...

In June 2011, walnuts (Juglans regia) from orchards in Kimcheon and Muan, in southern Korea, were found to exhibit downy mildew-like symptoms of a foliar disease. Whitish polygonal efflorescence was produced on the abaxial surface of affected leaves and discolored light green blotches on the corresponding adaxial surfaces. In the later stage of dis...

Phytophthora katsurae is the fungus responsible for chestnut ink disease. The objectives of this study were to determine if a single-strand conformation polymorphism (SSCP) analysis of rDNA-ITS region, elongation factor 1 alpha gene and -tubulin gene could be used for rapid identification and genetic diversity of P. katsurae, and to assess the pote...

Recently, the oak wilt diseases especially on Quercus mongolica, have been increasing in various districts of Korea. A collection of 38 strains of the oak wilt pathogen Raffaelea qeurcus-mongolicae and R. quecivora isolated from Quercus spp. in Korea and Japan was characterized by -tubulin gene sequence and randomly amplified polymorphic DNA (RAPD)...

Betula platyphylla var. japonica (Miq.) Hara, or Japanese whitebirch, is a tree which is widely distributed in East Asia. In July 2009,some young trees showing typical symptoms of powdery mildewdisease on both sides of their leaves were first found at HongneungArboretum, Korea Forest Research Institute, Seoul, Korea. White superficial colonies deve...

Since July 2005, survey of chestnut ink disease was carried out in chestnut stands located at southern parts of Korea. Dead chestnut trees showing inky ooze on necrotic trunks were found in two different locations. In order to isolate and identify the causal fungus, infected tissues and soil samples around dead or dying trees were collected and pla...

In April 2008, cherry (Prunus yedoensis Matsumura) in Jeju exhibited severe disease of branches forming numerous twigs. Five isolates from diseased leaves were identified as Taphrina wiesneri on the basis of biological and genetic characteristics. Twenty one commercial fungicides were tested for control of the disease in vitro. Of the 21 fungicides...

We analysed 676 isolates from 33 Korean Cryphonectria parasitica subpopulations in Korea for dsRNA incidence and diversity. dsRNA was detected in 84 isolates. Although the dsRNA banding patterns varied in several minor bands, infected isolates could be categorized into two groups. The most common banding pattern occurred in 77 isolates and containe...

Bacterial wilt caused by Ralstonia solanacearum has become a severe problem on tomato in Korea and no effective control measures are available yet. Pseudomonas species play key roles for the biocontrol of many plant diseases especially in soil. A rhizobacterial population of 150 Pseudomonas strains, isolated from the rhizosphere soil of various pla...

In 2003 to 2005, the root rot of Japanese angelica (Aralia elata) was surveyed in nursery beds of Korea, where incidence of the disease often reached up to 100%. Three isolates were obtained from the infected roots, and identified as Phytophthora cactorum on the basis of cultural, morphological characteristics and molecular analysis. The isolates w...

Strains showing antifungal activity against Cryphonectria parasitica were isolated from coast soil of Taean , Korea. Of 152 strains isolated, 6 strains showed antifungal activity in vitro against C. parasitica. Ta24 strain showed highest activity with 1.6 cm clean inhibition zone. For strain identification, the morphological characteristic and 16S...