• Title/Summary/Keyword: pythium

Search Result 203, Processing Time 0.022 seconds

Antimicrobial Effect of the Wood Vinegar from Cryptomeria japonica Sapwood on Plant Pathogenic Microorganisms

  • HWANG YOUNG-HEE;MATSUSHITA YOH-ICHI;SUGAMOTO KAZUHIRO;MATSUI TAKANAO
    • Journal of Microbiology and Biotechnology
    • /
    • v.15 no.5
    • /
    • pp.1106-1109
    • /
    • 2005
  • The antimicrobial effect of the wood vinegar of C. japanica sapwood and its constituents was evaluated against Ralstonia salanacearum, Phytophthora capsid, Fusarium oxysporum, and Pythium splendens. Phenols and guaiacols had a strong antimicrobial effect against four kinds of microorganisms, but methanol and acetic acid exhibited little or no antimicrobial activity.

Biocontrol of Vegetables Damping-off by Bacillis ehimensis YJ-37 (Bacillus ehimensis YJ-37에 의한 채소류 모잘록병의 생물학적 방제)

  • 김진호;최용화;강상재;이인구;주길재
    • Journal of Life Science
    • /
    • v.12 no.4
    • /
    • pp.416-422
    • /
    • 2002
  • Bacillus ehimensis YJ-37 was observed as a potential biological agent to control the occurrence of diseases and plant growth.promoting rhizobacteria (PGPR). Population density of B. ehimensis YJ-37 were higher 1.2~2 times in main roots and lateral roots than from nonrhizosphere soil and persisted around 10$^4$g root on the watermelon and radish root system upto 30 days after growing in pot condition. As a PGPR, B. ehimensis YJ-37 enhanced plant growth of watermelon and radish by soil treatment. The leaf area, hypocotyl length, root length and dry weight of radish were about 85, 33, 23 and 89% more than that of untreated plant, respectively. In case of watermelon were about 63, 27, 25 and 69% more than that of untreated plant, respectively. Biocontrol of damping-off in watermelon and radish caused by Rhizoctonia solani AG-4 and Pythium ultimum were carried out in pots using 3. ehimensis YJ-37. The results showed that might contribute to it's suppression of damping-off disease in field plants.

Occurrence of Brown Patch Disease and Turfgrass Survival of Cool Season Turfgras Cultivar in Species during Summer Season (여름철 한지형 잔디의 갈색마름병 발생과 잔디 생존)

  • Chang, Tae-Hyun;Lee, Yong-Se
    • Asian Journal of Turfgrass Science
    • /
    • v.24 no.2
    • /
    • pp.117-124
    • /
    • 2010
  • Turfgrass survival and ocurrence of brown patch disease during summer season were investigated the forty six cultivars of cool season grasses in 6 species, popularly used in golf courses in Korea. Ocurrence of brown patch disease was evaluated two times in July. The percentage of turfgrass survival was investigated on Aug. 20 and on Sep. 20 in 2010. There were significant difference for the percentage of turfgrass survival and brown patch disease occurrence among cultivars. Brown patch disease caused by Rhizoctonia spp. and Pythium aphanidermatum with rDNA ITS were showed most susceptible in creeping bentgrass (Agrostis palustris Huds) cultivars and chewings fescue (Festuca rubra var. commutata Gaud) cultivars. The percentage of turfgrass survival during August to September was showed lower creeping bentgrass cultivars and chewings fescue cultivars than another cultivars. Among of 20 cultivars in Kentucky bluegrass (Poa pratensis L.) species were showed highest survival in cultivars of "Nuglade", "Cabernet", "Midnight II" and "Beyond". 6 cultivars of Tall fescue (Festuca arundinacea Schreb) were showed highest survival in cultivars of "Double sentry", "Inferno", and cultivars of "Accent II" in Perennial ryegrass (Lolium parenne L.) species.

Seedling Growth of Red Pepper and Antagonism on Alternaria alternata Causing Black Rot by Bacillus subtilis J-24 isolated from Red Pepper Rhizosphere (고추 근권에서 분리한 Bacillus subtilis J-24의 검은 곰팡이병원균 Alternaria alternata에 대한 길항력 및 고추의 초기 생육에 미치는 영향)

  • Joo, Gil-Jae;Kim, Hak-Yoon;Hur, Sang-Sun;Woo, Churl-Joo;Rhee, In-Koo
    • Current Research on Agriculture and Life Sciences
    • /
    • v.17
    • /
    • pp.7-13
    • /
    • 1999
  • Thirty bacteria were isolated from the red pepper rhizosphere. The isolates were screened for antagonism to Alternaria alteranta causing red pepper black rot. Antagonistic bacterium No. J-24 was selected among the isolated bacteria and was identified as Bacillus subtilis based on morphological and physiological characteristics and MIDI system. B. subtilis J-24 showed antifungal activities against A. alternata(inhibition percentage, 99%), Botrytis cinerea, Phytophthora capsici, Pythium ultimum, Colletotrichum gloeosporioides, Stemphylium botryosum. The growth of red pepper seedling was promoted as compared to control when the microbial inoculants was mixed in bed soil. In the mixed microbial inoculants bed soil, the leaf area of red pepper was increased of 15 percent, the hypocotyl weight 12 percent, the root length 12 percent, total dry weight 13 percent as compared to those grown in the general bed soil.

  • PDF

Screening of Cellulose Decomposing Microorganisms for Functional Improvement for SCB (Slurry Composting and Biofiltering) Liquid Fertilizer (SCB저농도액비의 기능성향상을 위한 섬유소 분해 미생물균주탐색)

  • Lim, Hye-Jung;Kim, Young-Sun;Ham, Suon-Kyu
    • Asian Journal of Turfgrass Science
    • /
    • v.25 no.1
    • /
    • pp.48-51
    • /
    • 2011
  • This study was performed to functional improvement by fermenting of SCB (Slurry Composting and Biofiltering) liquid fertilizer. After screening of cellulose decomposing test using microorganisms originated from composts produced with turf grass clipping, five kinds of Cellulose Decomposing Microorganisms (CDMs) were selected. The optimum medium for CDMs culture was Tryptic soy broth. The optimum fermenting time of CDMs in SCB liquid fertilizer was 36 hour. In addition, CDMs showed antimicrobial activity in vitro. Sclerotinia homoeocarpa, Rhizoctonia solani AG2-2(IV) and Pythium spp. were inhibited by CDMs, but Rhizoctonia solani AG2-2(IIIB) in vitro uneffected by CDMs we isolated.