• 제목/요약/키워드: cucumber plant

검색결과 745건 처리시간 0.029초

Impact of Rhizosphere Competence of Biocontrol Agents upon Diseases Suppression and Plant Growth Promotion

  • Park, Chang-Seuk-
    • 한국식물병리학회:학술대회논문집
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    • 한국식물병리학회 1994년도 Proceedings of International Symposium on BIOLOGICAL CONTROL OF PLANT DISEASES Korean Society of Plant Pathology
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    • pp.27-49
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    • 1994

  • Root colonization of biocontrol agents via seed treatment was investigated and a compatible combination, Gliocladium virens G872B and Pseudomonas putida Pf3, in colonizing cucumber rhizosphere was confirmed through the study. Much higher number of fungal and bacterial propagules were detected when two isolates were inoculated together. The presence of Pf3 in root system was greatly helpful to G872B to colonize at root tip. The mechanism of this phenomenon is partially elucidated through the results of in vitro experiments and the observations of scanning electron and fluorescence microscope. Addition of Pf3 cells resulted earlier germination of G872B conidia and increased mycelial growth. And the more number of germinated conidia on seed coat, the more vigorous hypal streching and sporulation on the root surface were observed in coinoculated treatment. The propagules of G872B on the cucumber root when they were challenged against the pathogenic Fusarium oxysporum, were even higher than that of G872B treated alone, and the magnitude of such a difference was getting grater toward the root ip and the population of F. oxysporum on the root was reduced by seed inoculation of G872B. The rhizosphere competence was obviously reflected to disease suppression and plant growth promotion that induced by the given isolate. Green house experiments revealed that the combined treatment provided long-term disease suppression with greater rate and the larger amount of fruit yield than single treatments. Through this study the low temperature growing Pseudomonas fluorescens M45 and MC07 were evaluated to apply them to the winter crops in field or plastic film house. In vitro tests reveal that M45 and MC07 inhibited the mycelial growth of Pythium ultimum, Rhizoctona solani and Phytophthora capsici and enhanced growth of cucumber cotyledon in MS agar. This effect was more pronounced when the bacteria were incubated at 14$^{\circ}C$ than at 27$^{\circ}C$. And disease suppression and plant growth promotion in green house were also superior at low temperature condition. Seed treatment of M45 or soil treatment of MC07 brought successful control of damping-off and enhanced seedling growth of cucumber. The combined treatment of two isolates was more effective than any single treatment.

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Enhancement of Biological Control of Botrytis cinerea on Cucumber by Foliar Sprays and Bed Potting Mixes of Trichoderma harzianum YC459 and Its Application on Tomato in the Greenhouse

  • Lee Sun-Kug;Sohn Hwang-Bae;Kim Geun-Gon;Chung Young-Ryun
    • The Plant Pathology Journal
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    • 제22권3호
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    • pp.283-288
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    • 2006

  • Trichoderma harzianum YC459 (Th 459), isolated from sawdust compost, was effective in controlling cucumber and tomato gray mold caused by Botrytis cinerea under controlled and plastic film tunnel conditions. A water suspension of the wettable powder formulation of Th 459 significantly $(P\leq0.05)$ reduced the severity of cucumber gray mold by foliar spraying at all tested concentrations from $10^5\;to\;10^8$ colony forming unit (cfu)/ml in repeated experiments. The control efficacy was maintained at least seven days with the average control value of 70% in cucumber pot tests. Mixing one to eight grams of the granular formulation ($10^8cfu/g$ dry weight) of Th 459 into one liter nursery potting mix at seeding also significantly $(P\leq0.05)$ reduced the severity of cucumber gray mold by suppression of lesion formation three weeks after treatment. Application of mixing granular formulation at seeding in combination with foliar spraying during cultivation provided a more significant reduction $(P\leq0.05)$ of cucumber gray mold than granule mixing or leaf spray alone. The foliar spraying of the formulated wettable powder of Th 459 significantly $(P\leq0.05)$ reduced the infection of tomato fruits by B. cinerea as effective as the chemical fungicide, dichlofluanid, in three plastic film tunnel experiment trials. It is suggested that effective control of gray mold of cucumber and tomato can be provided by both treatment of Th 459 into potting mix and foliar spray through induction of systemic resistance and direct inhibition of the pathogen.

  • https://doi.org/10.5423/PPJ.2006.22.3.283 인용 PDF KSCI

경북지역 오이에 발생하는 주요 바이러스 종류 및 발생실태 (Occurrence of Virus Diseases on Cucumber in Gyeongbuk Province)

  • 이중환;김동근;류영현;이기운
    • 식물병연구
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    • 제14권2호
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    • pp.138-141
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    • 2008

  • 경상북도 오이 주산단지인 상주와 군위지역의 바이러스 병 발생을 조사한 결과 포장 발생율은 $55.0{\sim}88.6%$였으며, 상주지역이 군위보다 약간 높게 나타났다. 바이러스 발병 포장의 이병주율은 2006년 상주 지역에서 평균 25.6%로 매우 높게 나타났으며, 발생범위는 최소 1.5%에서 최대 90%로 농가별로 편차가 매우 심하였다. 포장에서 바이러스 증상으로 관찰되는 시료 217점을 RT-PCR을 이용하여 바이러스 종류를 분석한 결과 ZYMV가 85% 이상으로 가장 많이 검출되어 오이에 피해를 주는 주요 바이러스로 나타났다. ZYMV에 감염된 오이는 잎에 황화 및 심한 모자이크 증상이 나타났으며 일부 과일은 곡과 증상과 함께 표면이 울퉁불퉁하게 나타났다.

  • https://doi.org/10.5423/RPD.2008.14.2.138 인용 PDF KSCI