• 식물병연구
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• 제9권4호
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• pp.221-223
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• 2003

2002년 경상남도농업기술원 함양약초시험 포장에 재배중인 꽃범의꼬리에서 이상증상이 발생하였다. 병징은 지제부의 줄기가 수침상으로 물러지고 부패하면서 암갈색으로 변하고 그 위에 흰색의 곰팡이가 솜털처럼 생기고, 병반 부위와 토양 표면에 갈색의 둥근 균핵이 많이 형성된다. 병원균의 균사생장 및 균핵형성은 PDA배지에 배양시 $30^{\circ}C$에서 가장 양호하였다. 균핵은 갈색 또는 암갈색으로 크기는 1${\sim}$3 mm이었다. 균사 특유의 clamp connection이 관찰되었고 균사 폭은 3.6${\sim}$9.4 ${\mu}m$이었다. 본 병원균을 Sclerotium rolfsii로 동정하였으며 꽃범의꼬리 흰비단병으로 명명할 것을 제안한다.

• 식물병연구
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• 제10권1호
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• pp.13-16
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• 2004

2000년 1월에 제주도 제주시 감자양액 재배포장에서 감자 줄기기부썩음병이 발생하였다. 병징은 감자 줄기기부와 뿌리가 갈변하였으며 심하면 고사하였다. 감자줄기 기부 썩음 증상으로부터 분리한 균의 균학적 특성을 조사한 결과 Pythium myriotylum으로 동정되었다 병원균의 주 균사의 폭은 8.4$\mu\textrm{m}$에 이르고, 장란기는 구형 또는 타원형으로 주변에 돌기가 형성되어 있지 않으며, 정생 또는 간생하였고, 크기는 21.6${\times}$31.2$\mu\textrm{m}$이었다 장정기 크기는 9.6∼14.4${\times}$4.8∼9.6$\mu\textrm{m}$이다. 난포자는 구형으로 매끈하며 주로 미충만형이고, 크기는 2l.6∼26.4$\mu\textrm{m}$이었다 수경재배 감자에서의 P. myriotylum에 의한 병은 아직 국내에 보고된 바 없어 감자 줄기기부썩음병을 최초로 보고한다.

• 식물병과 농업
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• 제5권2호
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• pp.119-121
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• 1999

A destructive collar rot of safflower occurred severely research farm of at Kyongsangnam-do Agricultural Research and Extension Services in 1999. Incidence of the disease at 3 fields in Chinju was ranged from 21.6 to 34.2% Upper parts of infected stems were mostly blighted and white mycelia were found on the lesions. The same fungus was isolated consistently from the infected tissues and confirmed its pathogenecity to safflower. The causal fungus of collar rot disease was identified as Sclerotium rolfsii by the examination of colony type sclerotium formation and pathogenicity test. This fungus also causes stem rot crown rot wilt or blight on the safflower. This is the first report on the collar rot of safflower caused by Sclerotium rolfsii in Korea.

• 식물병연구
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• 제16권3호
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• pp.323-325
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• 2010

2009년 9월 경상남도농업기술원 해바라기 재배포장에서 흰비단병이 발생되었다. 병징은 줄기 부분이 수침상으로 물러지고 부패되면서 병반부와 토양 표면에 흰색의 곰팡이가 솜털모양으로 생기고 갈색의 작은 둥근 균핵을 많이 형성하였다. 균핵의 크기는 1~3 mm이며 균사의 폭은 $4{\sim}8\;{\mu}m$이었다. 균사생육과 균핵형성의 적정온도는 $30^{\circ}C$이었다. 균사 특유의 clamp connection이 관찰되었다. 해바라기에 발생한 병징과 병원균의 균학적 특징 및 병원성을 검정한 결과, 이 병을 Sclerotium rolfsii에 의한 해바라기 흰비단병으로 명명하고자 제안한다.

• 식물병연구
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• 제12권1호
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• pp.55-57
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• 2006

2005년도 6월에서 8월 사이에 경상북도농업기술원 신물질연구소의 약용식물시험재배포장에서 재배하는 약모밀에서 줄기와 지제부가 수침상으로 물러지고 썩으면서 암갈색으로 변하는 증상이 발생하였고, 병반부와 지제부 주위의 토양에 흰색의 곰팡이가 생기고 시간이 경과함에 따라 갈색의 둥글고 부정형의 균핵이 형성되었다. 병원균을 순수 분리하여 감자한천 배지(PDA)에서 배양학적 형태적 특성을 조사한 결과 병원균의 생육적온은 $28{\sim}30^{\circ}C$ 이었으며, PDA에서 생육중인 균사의 폭은 $3.0{\sim}9.0{\mu}m$이었고, 형성된 균핵의 크기는 $1.0{\sim}2.5mm$이었으며, 균사 특유의 clamp connection 형태가 현미경하에서 관찰되었다. 병원성 실험결과 병원성이 인정되었다. 이상과 같이 병징과 균학적 특징 및 병원성을 검정한 결과, 이 병을 Sclerotium rolfsii에 의한 약모밀 흰비단병으로 명명하고자 한다.

• 식물병연구
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• 제11권1호
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• pp.85-87
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• 2005

2003년 6월에 경상남도 농업기술원 함양 약초시험포장에 재배중임 섬쑥부쟁이에서 Sclerotium rolfsii에 의한 흰비단병이 발생되였다. 병징은 줄기와 지제부위가 수침상으로 물러지고 부패하면서 암갈색으로 변하고 그 위에 흰색의 곰팡이가 솜털처럼 생기고, 병반부와 지제부위의 토양 표면에 갈색의 둥근 균핵을 많이 형성되었다. 병원균은 감자한천 배지상에서 왕성하게 생장하였으며 균사생장 중에 특유의 clamp connection이 관찰되었다. 균사의 크기는 3~$8\mu\textrm{m}$이었다. 감자한천 배지에서 갈색을 띤 구형 또는 부정형의 많은 균핵을 형성하였는데 균핵의 크기는 1~3mm였다. 균사생육 적온은 $30^{\circ}C$였다. 이상과 같이 병징과 균학적 특징 및 병원성을 검정한 결과, 이 병을 Sclerotium rolfsii에 의한 섬쑥부쟁이 흰비단병으로 명명하고자 한다.

• The Plant Pathology Journal
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• 제40권1호
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• pp.48-58
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• 2024

The oldest and most extensively cultivated form of millet, known as pearl millet (Pennisetum glaucum (L.) R. Br. Syn. Pennisetum americanum (L.) Leeke), is raised over 312.00 lakh hectares in Asian and African countries. India is regarded as the significant hotspot for pearl millet diversity. In the Indian state of Haryana, where pearl millet is grown, a new and catastrophic bacterial disease known as stem rot of pearl millet spurred by the bacterium Klebsiella aerogenes (formerly Enterobacter) was first observed during fall 2018. The disease appears in form of small to long streaks on leaves, lesions on stem, and slimy rot appearance of stem. The associated bacterium showed close resemblance to Klebsiella aerogenes that was confirmed by a molecular evaluation based on 16S rDNA and gyrA gene nucleotide sequences. The isolates were also identified to be Klebsiella aerogenes based on biochemical assays, where Klebsiella isolates differed in D-trehalose and succinate alkalisation tests. During fall 2021-2023, the disease has spread all the pearl millet-growing districts of the state, extending up to 70% disease incidence in the affected fields. The disease is causing considering grain as well as fodder losses. The proposed scale, consisting of six levels (0-5), is developed where scores 0, 1, 2, 3, 4, and 5 have been categorized as highly resistant, resistant, moderately resistant, moderately susceptible, susceptible, and highly susceptible disease reaction, respectively. The disease cycle, survival of pathogen, and possible losses have also been studied to understand other features of the disease.

• The Plant Pathology Journal
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• 제35권3호
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• pp.219-233
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• 2019

Soybean cultivars susceptible to Phytophthora root and stem rot are vulnerable to seed rot and damping-off of seedlings and young plants following an infection by Phytophthora sojae. In this study, the disease responses of Japanese soybean cultivars including currently grown main cultivars during the early growth stages were investigated following infections by multiple P. sojae isolates from Japanese fields. The extent of the resistance to 17 P. sojae isolates after inoculations at 14, 21, and 28 days after seeding varied significantly among 18 Japanese and two US soybean cultivars. Moreover, the disease responses of each cultivar differed significantly depending on the P. sojae isolate and the plant age at inoculation. Additionally, the treatment of 'Nattosyo-ryu' seeds with three fungicidal agrochemicals provided significant protection from P. sojae when plants were inoculated at 14-28 days after seeding. These results indicate that none of the Japanese soybean cultivars are completely resistant to all tested P. sojae isolates during the first month after sowing. However, the severity of the disease was limited when plants were inoculated during the later growth stages. Furthermore, the protective effects of the tested agrochemicals were maintained for at least 28 days after the seed treatment. Japanese soybean cultivars susceptible to Phytophthora root and stem rot that are grown under environmental conditions favorable for P. sojae infections require the implementation of certain practices, such as seed treatments with appropriate agrochemicals, to ensure they are protected from P. sojae during the early part of the soybean growing season.

• The Plant Pathology Journal
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• 제32권5호
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• pp.396-406
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• 2016

Continuous supplementation of mineral nutrients and salicylic acid (SA) as foliar application could improve efficacy in controlling basal stem rot (BSR) disease in oil palm seedling. It is revealed from the results that the highest disease severity index (58.3%) was recorded in T8 treatments at 9 months after inoculation. The best disease control was achieved by T7 treatments (calcium/copper/SA [Ca/Cu/SA]) (5.0%) followed by T1 (5.5%), T5 (5.8%), T3 (8.3%), T6 (8.3%), T4 (13.3%), and T2 (15.8%) treatments. Continuous supplementation of Ca/Cu/SA was found to be the most effective in controlling the disease and the high performance liquid chromatography results showed the detection of ergosterol at very low concentration in the treated samples. Moreover, the transmission electron microscopy analysis results clearly indicated that T7 treatment was also enhancing lignification, which was responsible for the thickness of the secondary cell walls and middle lamella compared to untreated samples. It was therefore, concluded that continuous supplementation of minerals nutrients and SA could effectively suppress disease severity by reducing ergosterol activity and also improve the process of lignification in the treated plants. Furthermore, this treatment also managed to delay the onset of BSR symptoms and promote the growth of the seedlings and eventually suppress the BSR disease.

• 미생물학회지
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• 제1권1호
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• pp.45-47
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• 1963

1. A Kind of Bacillus, which was seemed to be pathogenic, was isolated from Pinus rigida planting. 2. The bacillus were grown well on the Agar-Bacto-Beef media (pH 7.4) at $30^{\circ}C$. C for 24 hours. 3. The soil infection for the one year old seedling was the best inoculating method in this experiment. 4. Almost of all characteristics were simillar between isolated and reisolated bacillus. 5. The author should like to call temporarily the name of this bacterial disease Stem-rot of pinus rigida Mill.