• 제목/요약/키워드: Gray mold

검색결과 260건 처리시간 0.025초

Biocontrol of gray mold of cucumber and tomato by epihpytic bacteria in field condition

  • Lee, Sang-Yeob;Lee, Sang-Bum;Kim, Il-Yon;Kim, Yong-Ki
    • 한국식물병리학회:학술대회논문집
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    • 한국식물병리학회 2003년도 정기총회 및 추계학술발표회
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    • pp.104.2-105
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    • 2003
  • Bacterial isolates, CC178, PTC25, HC39 and KY165 originally obtained from the leaves of cucumber or tomato were selected for biocontrol agents against gray mold of cucumber and tomato by in vivo cucumber seedling assay. Each suspension of the selected epiphytic bacteria were sprayed three times at seven-day interval from early stage of cucumber in a field. Incidence of gray mold on cucumber fruits treated with isolates CC178, PTC25, HC39 and KY165 was 15.3%, 18.2%, 23.6%, and 10.4%, respectively, whereas that of control was 38.0% after 7 days of final spray. On the other hand, treatment with the selected isolates, CC178, PTC25, HC39, and KY165 on tomato showed 2.2%, 1.3%, 2.9%, and 3.5% in the incidence of gray mold on leaves, whereas that of control was 9.3%. All selected isolates had strong antagonistic activity against Botrytis cinerea on dual culture plate assay.

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Botrytis cinerea에 의한 바이올렛 잿빛곰팡이병 (Gray Mold on Saintpaulia ionantha Caused by Botrytis cinerea in Korea)

  • 김형무
    • 식물병연구
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    • 제17권1호
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    • pp.75-77
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    • 2011
  • 전북 전주시 화원에서 Botrytis cinerea에 의한 바이올렛 잿빛곰팡이병이 발생하였다. 병징은 꽃, 잎과 잎자루가 수침상으로 물러지고 부패되었다. 다습조건에서 병반위에 잿빛색의 분생포자가 많이 형성하였다. 균총은 PDA 배지에서 회갈색이며 균핵을 형성하였다. 분생포자는 단포자, 난형 또는 타원형으로 무색 또는 옅은 갈색이고, 크기는 $7{\sim}14{\times}5{\sim}9\;{\mu}m$이었다. 바이올렛에 발생한 병징과 병원균의 균학적 특징을 조사한 결과 B. cinerea Persoon:Fries에 의한 바이올렛 잿빛곰팡이병으로 명명할 것을 제안한다.

Bacillus sp. BS061 Suppresses Gray Mold and Powdery Mildew through the Secretion of Different Bioactive Substances

  • Kim, Young-Sook;Song, Ja-Gyeong;Lee, In-Kyoung;Yeo, Woon-Hyung;Yun, Bong-Sik
    • Mycobiology
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    • 제41권3호
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    • pp.164-166
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    • 2013
  • A Bacillus sp. BS061 significantly reduced disease incidence of gray mold and powdery mildew. To identify the active principle, the culture filtrate was partitioned between butanol and water. The antifungal activity against B. cinerea was evident in the butanol-soluble portion, and active substances were identified as cyclic lipopeptides, iturin A series, by nuclear magnetic resonance spectrometry (NMR) and mass analysis. Interestingly, antifungal activity against powdery mildew was observed in the water-soluble portion, suggesting that cyclic lipopeptides have no responsibility to suppress powdery mildew. This finding reveals that biocontrol agents of Bacillus origin suppress gray mold and powdery mildew through the secretion of different bioactive substances.

Antagonistic Effect of Streptomyces sp. BS062 against Botrytis Diseases

  • Kim, Young-Sook;Lee, In-Kyoung;Yun, Bong-Sik
    • Mycobiology
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    • 제43권3호
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    • pp.339-342
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    • 2015
  • The use of microorganisms and their secreted molecules to prevent plant diseases is considered an attractive alternative and way to supplement synthetic fungicides for the management of plant diseases. Strain BS062 was selected based on its ability to inhibit the mycelial growth of Botrytis cinerea, a major causal fungus of postharvest root rot of ginseng and strawberry gray mold disease. Strain BS062 was found to be closely related to Streptomyces hygroscopicus (99% similarity) on the basis of 16S ribosomal DNA sequence analysis. Postharvest root rot of ginseng and strawberry gray mold disease caused by B. cinerea were controlled up to 73.9% and 58%, respectively, upon treatment with culture broth of Streptomyces sp. BS062. These results suggest that strain BS062 may be a potential agent for controlling ginseng postharvest root rot and strawberry gray mold disease.

수출딸기 선별장에서 잿빛곰팡이병원균 밀도조사와 저장온도에 따른 잿빛곰팡이병 발생 연구 (Studies on Botrytis cinerea Density in Packing Shed and Gray Mold Incidence Following Storage-Temperature in Exported Strawberry)

  • 김다란;전창욱;곽연식
    • 농약과학회지
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    • 제19권3호
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    • pp.295-300
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    • 2015
  • 국내 딸기는 현재 홍콩, 싱가포르 및 동남아시아 지역으로 수출량이 증대되고 있는 가운데 유통과정에서 환경조건에 따라 품질에 손상이 크게 발생하고 있다. 주로 수출딸기에 품질손상을 일으키는 잿빛곰팡이병은 다른 국가로 이동하는 동안 혹은 수입국에서 소비자에게 판매되기까지의 기간 동안 발생하고 있다. 본 연구는 수출딸기 선별장 공기중 부유중인 잿빛곰팡이병원균의 밀도와 저장중 발병률에 관한 상관관계를 규명하기 위하여 수행되었다. 공기중 병원균의 밀도가 증가함에 따라 저온 저장중 병 발생율이 최대 16%로 나타났다. 상온저장의 경우 상대적으로 공기중 병원균의 밀도가 낮게 조사된 12월 말부터 발병율 100%가 관찰 되었다. 본 연구결과, 선별장의 잿빛곰팡이 병원균 밀도와 저장중 병발생의 상관관계가 구명되었다.

Biocontrol Activity of Acremonium strictum BCP Against Botrytis Diseases

  • Choi, Gyung-Ja;Kim, Jin-Cheol;Jang, Kyoung-Soo;Nam, Myeong-Hyeon;Lee, Seon-Woo;Kim, Heung-Tae
    • The Plant Pathology Journal
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    • 제25권2호
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    • pp.165-171
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    • 2009
  • Biological control activity of Acremonium strictum BCP, a mycoparasite on Botrytis cinerea, was examined against six plant diseases such as rice blast, rice sheath blight, cucumber gray mold, tomato late blight, wheat leaf rust, and barley powdery mildew in growth chambers. The spore suspension of strain BCP showed strong control activities against five plant diseases except against wheat leaf rust. On the other hand, the culture filtrate of A. strictum BCP was effective in controlling only cucumber gray mold and barley powdery mildew. Further in vivo biocontrol activities of A. strictum BCP against tomato gray mold were investigated under greenhouse conditions. Control efficacy of the fungus on tomato gray mold increased in a concentration-dependent manner. Treatment of more than $1{\times}10^6$ spores/ml significantly controlled the disease both in tomato seedlings and in adult plants. The high disease control activity was obtained from protective application of the strain BCP, whereas the curative application did not control the disease. Foliar infections of B. cinerea were controlled with $1{\times}10^8$ spores/ml of A. strictum BCP applied up to 7 days before inoculation. In a commercial greenhouse, application of A. strictum BCP exhibited the similar control efficacy with fungicide procymidone (recommended rate, $500{\mu}g/ml$) against strawberry gray mold. These results indicate that A. strictum BCP could be developed as a biofungicide for Botrytis diseases under greenhouse conditions.

Inhibitory Abilities of Bacillus Isolates and Their Culture Filtrates against the Gray Mold Caused by Botrytis cinerea on Postharvest Fruit

  • Chen, Xiaomeng;Wang, Yajie;Gao, Yu;Gao, Tongguo;Zhang, Dongdong
    • The Plant Pathology Journal
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    • 제35권5호
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    • pp.425-436
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    • 2019
  • Botrytis cinerea, a major phytopathogenic fungus, has been reported to infect more than 200 crop species worldwide, and it causes massive losses in yield. The aim of this study was to evaluate the inhibitory abilities and effects of Bacillus amyloliquefaciens RS-25, Bacillus licheniformis MG-4, Bacillus subtilis Z-14, and Bacillus subtilis Pnf-4 and their culture filtrates and extracts against the gray mold caused by B. cinerea on postharvest tomato, strawberry, and grapefruit. The results revealed that the cells of Z-14, culture filtrate of RS-25, and cells of Z-14 showed the strongest biocontrol activity against the gray mold on the strawberry, grape, and tomato fruit, respectively. All the strains produced volatile organic compounds (VOCs), and the VOCs of Pnf-4 displayed the highest inhibition values. Based on headspace solid-phase microextraction in combination with gas chromatography-mass spectrometry, esters accounted for the largest percentage of the VOCs produced by RS-25, MG-4, Z-14, and Pnf-4 (36.80%, 29.58%, 30.78%, and 36.26%, respectively). All the strains showed potent cellulase and protease activities, but no chitinase activity. RS-25, Z-14, and MG-4, but not Pnf-4, grew on chrome azurol S agar, and an orange halo was formed around the colonies. All the strains showed biofilm formation, fruit colonization, and lipopeptide production, which may be the main modes of action of the antagonists against B. cinerea on the fruit. This study provides the basis for developing natural biocontrol agents against the gray mold caused by B. cinerea on postharvest fruit.

Botrytis cinerea에 의한 칼란코에 잿빛곰팡이병 (Gray Mold of Kalanchoe (Kalanchoe blossfeldiana) Caused by Botrytis cinerea in Korea)

  • 권진혁;박창석
    • 식물병연구
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    • 제9권3호
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    • pp.145-148
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    • 2003
  • 2002년 4월 창원시 대산면 농가 육묘장에서 칼란코에 잿빛곰팡이병이 발생하였다. 병징은 꽃, 꽃자루, 줄기부분이 수침상으로 물러지고 썩으면서 병반부위에 회색의 곰팡이가 많이 생기고, 심하게 감염된 부위는 결국 말라 죽었다. 분생포자는 무색, 단포자이며 난형 또는 타원형으로 크기는 8~17 ${\times}$ 5~12${\mu}m$였고, 분생자경 위에 분생포자가 아주 많이 형성되었다. 분생자경은 갈색으로 격막이 있고, 폭은 13~34${\mu}m$였다. 균사생장과 균핵형성의 적온은 $20^{\circ}C$였다. 위 특성으로 병반에서 분리한 병원균은 Botrytis cinerea에 의한 칼란코에 잿빛곰팡이병균으로 동정되었다.

Botrytis cinerea에 의한 백일홍 잿빛곰팡이병 (Gray Mold of Zinnia elegans Caused by Botrytis cinerea in Korea)

  • 권진혁;손경애;정선기;박창석
    • 식물병연구
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    • 제10권4호
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    • pp.337-340
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    • 2004
  • 2003년 4월 경남농업기술원 유리온실과 농가 육묘장에서 Botrytis cinerea에 의한 백일홍 잿빛곰팡이병이 발생하였다. 병징은 잎과 줄기에 발생하여 병든 부분이 수침상으로 물러지고 썩으면서 병반부위에 회색의 곰팡이가 많이 생기고, 심할 경우 감염된 부위는 결국 말라 죽는다. 분생포자는 무색, 단포자이며 난형 또는 타원형으로 크기는 5${\sim}$16${\times}$4${\sim}$8 ${\mu}m$였고, 분생자경 위에 분생포자가 아주 많이 형성되었다. 분생포자경은 갈색으로 격막이 있고, 폭은 12${\sim}$28 ${\mu}m$였다. 균핵의 모양은 납작하거나 부정형이고 색깔은 검은색이었다. 균사생육과 균핵형성 적온은 $20^{\circ}C$였다. 병반에서 분리한 병원균은 Botrytis cinerea Persoon: Fries에 의한 백일홍 잿빛곰팡이병으로 동정되었다.

Botrytis cinerea에 의한 프리뮬러 잿빛곰팡이병 (Gray Mold of Primula Caused by Botrytis cinerea)

  • 권진혁;박창석
    • 식물병연구
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    • 제8권1호
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    • pp.66-69
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    • 2002
  • 2002년 2월 진주시 농가 육묘장에서 B. cinerea에 의한 프리뮬러 잿빛곰팡이 병이 발생하였다. 병징은 꽃잎, 꽃받침, 꽃자루, 잎, 줄기에 발생하여 병든 부분이 수침상으로 물러지면서 썩으며 병반부위에 회색의 곰팡이가 많이 생기고 심할 경우 감염된 부위는 결국 말라죽는다. 분생포자는 무색 , 단포자이며 난형 또는 타원형으로 크기는 6.8~16.9$\times$4.6~12.4 $\mu$m였고, 분생자경 위에 분생포자가 아주 많이 형성되었다. 분생자경은 갈색으로 격막이 있고 폭은 15.9~31.6$\mu$m였다. 감자한천배지(PDA)에서 균사생육과 균핵형성 적온은 2$0^{\circ}C$이었다. 병반에서 분리한 병원균은 Botrytis cinerea에 의한 프리뮬러 잿빛곰팡이병균으로 동정되었다.