• 한국균학회지
• /
• 제38권2호
• /
• pp.208-209
• /
• 2010

2007년과 2008년에 국내 7지역의 유채재배 포장을 대상으로 발생하고 있는 병을 조사한 결과, 노균병이 1지역을 제외한 6지역에서 공통적으로 발생하였다. 본 연구에서는 국내에서 육성한 유채품종을 대상으로 노균병에 대한 포장저항성 시험 결과를 제공한다.

• The Plant Pathology Journal
• /
• 제35권2호
• /
• pp.100-111
• /
• 2019

Glomerella leaf spot (GLS) caused by Colletotrichum spp. is a destructive disease of apple restricted to a few regions worldwide. The distribution and evolution of GLS symptoms were observed for two years in Uruguay. The recurrent ascopore production on leaves and the widespread randomized distribution of symptoms throughout trees and orchard, suggest that ascospores play an important role in the disease dispersion. The ability of ascospores to produce typical GLS symptom was demonstrated by artificial inoculation. Colletotrichum strains causing GLS did not result in rot development, despite remaining alive in fruit lesions. Based on phylogenetic analysis of actin, ${\beta}$-tubulin and glyceraldehyde-3-phosphate dehydrogenase gene regions of 46 isolates, 25 from fruits and 21 from leaves, C. karstii was identified for the first time causing GLS in Uruguay and C. fructicola was found to be the most frequent (89%) and aggressive species. The higher aggressiveness of C. fructicola and its ability on to produce abundant fertile perithecia could help to explain the predominance of this species in the field.

• The Plant Pathology Journal
• /
• 제38권2호
• /
• pp.131-145
• /
• 2022

Ceratocystis wilt disease has caused significant mortality in duku (Lansium domesticum) since 2014 and has now spread to all districts in South Sumatra, Indonesia. Recently, 16 isolates from duku representing populations from various districts in South Sumatra were isolated. Analysis for the morphological characteristic of the isolate showed that the population has a uniform morphology. Genetic analysis based on internal transcribed spacer (ITS) and β-tubulin sequences verified that the population has being dominated by the ITS5 haplotype of Ceratocystis fimbriata and a new ITS group, the ITS7b haplotype that was localized in Musi Banyuasin. Both haplotypes were highly pathogenic to duku. Inoculation tests on various forest and agroforestry plant hosts showed that both haplotypes were highly pathogenic to Acacia mangium, moderately pathogenic to Acacia carsicarpa, Eucalyptus urophylla, and Melaleuca cajuputi, but weakly pathogenic to Dyera costulata, Hevea brasiliensis, and Alstonia scholaris. Therefore, this pathogen becomes a serious threat to Indonesia's biodiversity due to its ability to infect forest and agroforestry plants, especially the indigenous ones.

• The Plant Pathology Journal
• /
• 제25권2호
• /
• pp.121-127
• /
• 2009

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 placed on Phytophthora-selective medium. Rhododendron and chestnut tree leaves were used as a bait to isolate the fungus from soil samples by attracting zoospores in soil suspensions. On V-8 culture medium, the isolates produced homothallic oogonia with protuberances ($34.0-46.2{\times}21.9-26.7{\mu}m$) abundantly, but did not produced sporangia. Mass production of sporangia was possible by immersing agar plugs with actively growing mycelium in the creek water at $18^{\circ}C$ for 3 days. Sporangia were papillate, and ovoid to obpyriform ($17.0-38.9{\times}14.6-29.2{\mu}m$) in shape. Comparison of the ITS sequences revealed that the isolates had 100% identity to the P. katsurae isolates from Japan and New Zealand and 99.6% identity to other P. katsurae isolates. All of the examined isolates from Korea were completely identical to each other in ITS sequence. Numerous sporangia were formed in filtered as well as unfiltered creek water, but no sporangia formed in sterilized distilled water. Light induced sporangia formation, but has no influence on oospore formation. Amendments of ${\beta}$-sitosterol in culture media have no significant effect on mycelial growth but significantly stimulate oospore and sporangia formation.

• The Plant Pathology Journal
• /
• 제39권1호
• /
• pp.52-61
• /
• 2023

Fire blight, caused by Erwinia amylovora, is one of the major bacterial disease of apple and pear, causing enormous economic losses worldwide. Several control measures against E. amylovora have been reported till date, however, none of them have proved to be effective significantly against the pathogen. In this study, mechanisms of the copper-based control agents (CBCAs): copper oxychloride (COCHL), copper oxide (COX), copper hydroxide (CHY), copper sulfate basic (CSB), and tribasic copper sulfate (TCS) and their disease severity reduction efficacy against E. amylovora were analyzed. Bis-1,3-dibutylbarbituric acid trimethine oxonol, carboxyl fluorescein diacetate succinimidyl ester, and 5-cyano-2,3-ditolyl tetrazolium chloride staining were used to check the damage of membrane potential, cytoplasmic pH_in, and respiration of CBCAs-treated E. amylovora, respectively. High disturbance in the membrane potential of E. amylovora was found under COX and COCHL treatments. Similarly, higher significant changes in the inner cytoplasmic pH_in were observed under COX, COCHL, and TCS treatment. CHY and COCHL-treated E. amylovora showed a significant reduction in respiration. In vitro bioassay results revealed that CHY, CSB, and TCS at 2,000 ppm reduced the severity of fire blight both in pre- and post-treatment of CBCAs in immature apple fruits and seedlings. Overall, the most effective CBCAs against E. amylovora could be CHY at 2,000 ppm as its showed inhibition mechanisms and disease severity reduction.

• 식물병연구
• /
• 제17권2호
• /
• pp.232-234
• /
• 2011

During survey of postharvest diseases of vegetables in the middle region of Korea in 2003, 2004 and 2005, new disease symptoms showing watery rot and soft rot were observed. In this study, the disease causal agents were identified as Geotrichum candidum, and their host range and pathogenicity were investigated. G. candidum isolated had wide host range and strong pathogenicity against carrot, cucumber, tomato and pumpkin. The disease occurrence on several vegetables that G. candidum can be a serious threat to stable production of fresh vegetable.

• The Plant Pathology Journal
• /
• 제17권6호
• /
• pp.368.3-368
• /
• 2001

• 한국식물병리학회:학술대회논문집
• /
• 한국식물병리학회 1999년도 정기총회 및 춘계 학술발표회
• /
• pp.4-5
• /
• 1999

• 농약과학회지
• /
• 제19권4호
• /
• pp.394-398
• /
• 2015

본 연구는 잎집무늬마름병에 대한 약제방제수준을 설정하기 위하여 오대벼를 공시하여 시험을 수행하였다. 잎집무늬마름병 발병정도에 따라 수량에 미치는 관계를 분석하였으며, 수량 구성 요소인 주당 이삭수, 이삭당 립수, 등숙률, 천립중과의 관계를 분석하였다. 그 결과 발병주율에 대한 수량과의 관계는 r = -0.93, 이삭당 립수 r = -0.66, 등숙율은 r = -0.77로 고도의 유의성 있는 부의 상관이 있었으나, 주당 이삭수와 천립중은 유의한 상관이 인정되지 않았다. 따라서 본시험에서는 발병과 상관이 높은 수량에 대하여 경제적 방제수준은 발병주율 7.8%로 설정할 수 있었다.

• 한국가금학회지
• /
• 제46권4호
• /
• pp.263-269
• /
• 2019

IBV는 전세계적으로 양계산업에 문제시되고 있는 호흡기성 질병으로 육계 및 산란계의 생산성에 큰 영향을 미치고 있다. 본 연구는 2018년도에 분리된 3개의 IBV의 병원성을 확인하였다. 동물실험을 통해서 염증정도, 섬모소실도 그리고 폐사율의 결과를 바탕으로 2018년도 분리주인 QX-like IBV형은 병아리에게서 충분한 병원성을 지닌 것을 확인하였다.