• Title, Summary, Keyword: Phytophthora blight

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Induction of Resistance by TMV Infection in Capsicum annuum Against Phytophthora Blight (TMV 감염에 의한 고추의 역병 저항성 유도)

  • 이성희;이주연;차재순
    • Korean Journal Plant Pathology
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    • v.14 no.4
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    • pp.319-324
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    • 1998
  • Induction of systemic acquired resistance (SAR) against phytophthora blight and pathogenesis-related (PR) protein accumulation by TMV infection in pepper plant (Capsicum annuum cv. Nockwang) were examined to understand the mechanism of the systemic acquired resistance in pepper plant. The zoospore suspension of Phytophthora capsici was inoculated on stem of pepper plant in which TMV-pepper strain had been inoculated on fully expanded upper leaves, and thephytopha blight incidence was examined. Both disease severity and lesion length of phytophthora blight were much smaller in TMV pre-inoculated pepper plant than in uninoculated control plants. The phytophthora blight incidence was decreased about 50% in the TMV pre-inoculated pepper, compared to the uninoculated control plant at 10 days after P. capsici inoculation. Accumulation of PR1 and PR5 proteins in intercellular fluid of TMV-inoculated and uninoculated upper leaves were monitored by immuno-blot with tobacco P1b and PR5a, antibody during induction of SAR. PR1 and PR5 were detected from 24 hours after TMV inoculation in both TMV-inoculated and uninouclated upper leaves, and increased rapidly in TMV-inoculation in uninoculated upper leaves were defoliated. PR5 could be detected upto 20 days after TMV inoculation in uninoculated upper leaves. These results suggest that TMV infection induces SAR against phytophthora blight in pepper plant, and that PR proteins are accumulated very rapidly during induction of SAR and maintained for quite long time in pepper plant.

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Ethyl Acetate Extract of Bacillus pumilus SH122 Induces Resistance Against Phytophthora Blight in Pepper Plant

  • Lee, Seoung-Hee;Cha, Jae-Soon
    • The Plant Pathology Journal
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    • v.15 no.6
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    • pp.319-322
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    • 1999
  • In order to obtain bacterial metabolites inducing disease resistance in pepper plant, two hundred bacterial isolates were isolated from the rhizosphere soil of tobacco, cucumber, and pepper plant. Ethyl acetate extract of each bacterial culture was used to screening for induction of resistance against phytophthora blight of pepper plant. Application of ethyl acetate extract of an isolate SH122 culture to pepper plant conferred resistance against phytophthora blight consistently and significantly. According to cellular fatty acid analysis and other characteristics, the SH122 culture were significantly lower than those on control plants treated with ethyl acetate extract of nutrient broth. The B. pumilus SH122 itself of ethyl acetate extract of its culture did not show antifungal activity against phytophthora blight in pepper plants.

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Defense Response and Suppression of Phytophthora Blight Disease of Pepper by Water Extract from Spent Mushroom Substrate of Lentinula edodes

  • Kang, Dae-Sun;Min, Kyong-Jin;Kwak, A-Min;Lee, Sang-Yeop;Kang, Hee-Wan
    • The Plant Pathology Journal
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    • v.33 no.3
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    • pp.264-275
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    • 2017
  • The spent mushroom substrate (SMS) of Lentinula edodes that was derived from sawdust bag cultivation was used as materials for controlling Phytophthora blight disease of pepper. Water extract from SMS (WESMS) of L. edodes inhibited mycelial growth of Phytophthora capsici, suppressed Phytophthora blight disease of pepper seedlings by 65% and promoted growth of the plant over 30%. In high performance liquid chromatography (HPLC) analysis, oxalic acid was detected as the main organic acid compound in WESMS and inhibited the fungal mycelium at a minimum concentration of 200 mg/l. In quantitative real-time PCR, the transcriptional expression of CaBPR1 (PR protein 1), CaBGLU (${\beta}$-1,3-glucanase), CaPR-4 (PR protein 4), and CaPR-10 (PR protein 10) were significantly enhanced on WESMS and DL-${\beta}$-aminobutyric acid (BABA) treated pepper leaves. In addition, the salicylic acid content was also increased 4 to 6 folds in the WESMS and BABA treated pepper leaves compared to water treated leaf sample. These findings suggest that WESMS of L. edodes suppress Phytophthora blight disease of pepper through multiple effects including antifungal activity, plant growth promotion, and defense gene induction.

In vitro and In vivo Activities of a Biocontrol Agent, Serratia plymuthica A2l-4, Against Phytophthora capsici

  • Shen, Shun-Shan;Park, Ok-Hee;Lee, Sun-Mi;Park, Chang-Seuk
    • The Plant Pathology Journal
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    • v.18 no.4
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    • pp.221-224
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    • 2002
  • In vitro and in vivo activities of a biocontrol agent, Serratia plymuthica strain A2l-4, was evaluated for the control of Phytophthora blight of pepper, Strain A2l-4 inhibited mycelial growth, germination of zoosporangia and cystospores, and formation of zoospore and zoosporangia of Phytophthora capsici in vitro. In the pot experiment, incidence of Phytophthora blight of pepper in non-treated control was 100% at 14 days after inoculation, while no disease was observed in the plot treated with S. plymuthica A2l-4. In the greenhouse test, infection rate of pepper in the non-treated plots was 74.5%, while it was only 12.6% in the plots treated with A2l-4. Results indicate that S. plymuthica A2l-4 is a potential biocontrol agent for Phytophthora blight of pepper.

Occurrence of Boxthorn Bligth Casued byPhytophthora nicotivanea and P. drechsleri (Phytophthora nicotianae와 P. drechsleri에 의한 구기자 역병의 발생)

  • 지형진;곽용범;이봉춘;조원대
    • Korean Journal Plant Pathology
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    • v.14 no.4
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    • pp.294-298
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    • 1998
  • Since 1995, boxthorn bight caused by Phytophthora spp. has occurred at Chongyang areas in Chungnam province. Infected plants showed yellows and wilt at early stage, but the symptom rapidly progressed into blight due to the decay of roots and basal stem tissues. The disease was relatively severe in poorly drained lowlands and incidence reached ca. 20% in some fields. Two species of Phytophthora were constantly isolated from freshly infected roots and asal stems. Among 39 isolates collected, 26 were identified as P. nicotianae and 13 as P. drechsleri based on their mycological characteristics. Both fungi showed strong pathogenicity to boxthorn cv. Chongyang No. 1. However, the former expressed stronger pathogenicity than the latter. Phytophthora blight of boxthorn caused by the fungi has not been reported n Korea previously.

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Breeding Lines with Multiple Resistance to both Bacterial Writ and Phytophthora Blight in Pepper(Capsicum annuum L.) (고추 풋마름병.역병 복합 저항성 계통육성)

  • Han, Jeong-Hye;Kim, Joo-Young;Hwang, Hee-Sook;Kim, Byung-Soo
    • Current Research on Agriculture and Life Sciences
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    • v.18
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    • pp.9-17
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    • 2000
  • In an effort to breed lines resistant to both bacterial wilt and Phytophthora blight, F5 and BC1F4, and F6 and BC1F5 generations of the crosses between the lines previously bred for resistance to Phytophthora blight ((16-2-2-3-2 = Phytophthora-resistant 'Kalmi', 19-1-3-7-1-1, 19-2-4-5-3-2 = Phytophthora-resistant 'Subi', Kim et al., 1996) and sources of resistance to bacterial wilt (KC350 = MC-4 or KC353 = PBC631, Kim et al., 1998) were evaluated for resistance to both bacterial wilt and to Phytophthora blight in 1999 and in 2000, respectively. Plants which were highly resistant to both bacterial wilt and Phytophthora blight were selected for development of the next generations.

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Efficacy of Fluopicolide against Phytophthora capsici Causing Pepper Phytophthora Blight

  • Shin, Jin-Ho;Kim, Joo-Hyung;Kim, Hyung-Jo;Kang, Bumg-Wan;Kim, Kyeong-Tae;Lee, Jeong-Deug;Kim, Heung-Tae
    • The Plant Pathology Journal
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    • v.26 no.4
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    • pp.367-371
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    • 2010
  • In this study, we evaluated the efficacy of fluopicolide to inhibit Phytophthora capsici in vitro, and to control pepper Phytophthora blight in a greenhouse and pepper fields. Fluopicolide was tested on various developmental stages of P. capsici 06-143 (a sensitive isolate to metalaxyl) and JHAW1-2 (a resistant isolate to metalaxyl). Mycelial growth and zoosporangium germination of both isolates were completely inhibited at $4.0\;{\mu}g/ml$ of the fungicide in vitro. The $EC_{50}$ (effective concentrations reducing 50%) of P. capsici 06-143 against zoospore were $0.219\;{\mu}g/ml$, while those of JHAW1-2 were $3.829\;{\mu}g/ml$. When fluopicolide was applied at 100 and $1,000\;{\mu}g/ml$ 7 days before inoculation with P. capsici 06-143 in the greenhouse test, the disease was controlled completely until 6 days after inoculation. However, the curative effect of fluopicolide was not as much as the protective effect. When fluopicolide was applied by both soil drenching and foliar spraying, the treatments strongly protected pepper against the Phytophthora blight disease. Based on these results, fluopicolide can be a promising candidate for a fungicide to control P. capsici in the pepper fields.

Field Performance of a New Fungicide Ethaboxam Against Cucumber Downy Mildew, Potato Late Blight and Pepper Phytophthora Blight in Korea

  • Kim, Dal-Soo;Prak, Hyun-Cheol;Chun, Sam-Jae;Yu, Seung-Hun;Park, Kyong-Ju;Oh, Jeung-Haing;Shin, Kwang-Hoon;Koh, Young-Jin;Kim, Byung-Sup;Hahm, Young-Il;Chung, Bong-Koo
    • The Plant Pathology Journal
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    • v.15 no.1
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    • pp.48-52
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    • 1999
  • Ethaboxam is the first proprietary fungicide developed in Korea, registered in 1998 and commercialized in 1999 by LG Chemical Ltd., Korea. It is a derivative of aminothiazole carboxamide and formulated into 25% wettable powder for practical application in fields. Ethaboxam effectively controlled cucumber downy mildew caused by Pseudoperonospora cubensis, potato late blight caused by Phytophthora infestans, and pepper Phytophthora blight caused by P. capsici, and was superior or comparable to the commercial standards, when foliarly sprayed 3∼5 times until dripping off at approximately 7-day intervals during the growing season. Ethaboxam was required at least 125 mg/liter and 250 mg/liter for effective control of cucumber downy mildew, and potato late blight and pepper Phytophthora blight, respectively. There was not phytotoxicity observed o leaves, stems or fruits of cucumber, potato and pepper from any trial.

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Efficacy of Suppression of Phytophthora Blight of Red Pepper Caused by Phytophthora capsici by Treatment with Antagonistic Trichoderma harzianum DYMC in Greenhouse (온실에서 길항미생물 Trichoderma hazianum DYMC 처리에 의한 고추 역병 억제 효과)

  • Lee, Yong-Se;Chang, Tae-Hyun;Ryu, Yeon-Ju;Park, Jeong-Yong;Lim, Tae-Heon
    • Korean Journal of Environmental Agriculture
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    • v.24 no.4
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    • pp.409-415
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    • 2005
  • To control Phytophthora blight of red pepper biologically caused by Phytophthora capsici, we developed Trichoderma harzianum DYMC for commercial product. DYMC was storage at room temperature and was investigated their population every 3 months for 1 year. For investigating the dynamic population of T. harzianum in the pot soils, we applied powder and suspension applications with DYMC, and then investigated for 95 days. The efficacy of powder and suspension applications of DYMC for control of Phytophthora blight of red pepper and plant growth were investigated for 50 days in greenhouse experiment. The population of T. harzianum was decreased at the room temperature for 1 year but there was not statistically significance. After soil treated in the pot with DYMC, the population of Trichoderma spp. was the highest when DYMC powder at 5 g was applied to mix with pot soil, and the population was deceased significantly among treatment means as time goes by ($R^2=0.76$, F=10.5960, P=<.0001). Incidence of Phytophthora blight of, red pepper was significantly reduced among treatment means on 50th day after treated with DYMC ($R^2=0.82$, P=16.4758, P=<.0001). Disease control value was the highest at 62.5% when DYMC powder at 5 g was applied to mix with pot soil. No significant difference (P=0.05) of effects of plant and root growth showed by treated with DYMC on 60th day, except stem. Mixing the application of DYMC powder with soil to control Phytophthora blight of red pepper was greater than suspension application to dilute with water. DYMC could be used as an effective biocontrol agent to control Phythophthora blight of red pepper.

Phytophthora Blight on Daphne odora Caused by Phytophthora nicotianae (Phytophthora nicotianae에 의한 서향 역병)

  • Kwon, Jin-Hyeuk;Jee, Hyeong-Jin;Park, Chang-Seuk
    • Research in Plant Disease
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    • v.11 no.1
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    • pp.72-76
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    • 2005
  • In 2002 and 2003, Phytophthora blight on Daphne odora occurred in fields at Waryong Mountain, Sacheon city, Korea. The disease usually initiated on the root and crown of the plant. Crown lesions began with light brown as water-soaking. Infection rate of the disease reached up to 60% in a heavily infested fields. The causal fungus was identified as Phytophthora nicotianae based on following mycological characteristics. Sporangium: readily formed in water, papillate, noncaducous, ovoid to spherical, 23~$56{\times}$~34 $\mu\textrm{m}$ in size. Oogonium: spherical, smooth walled, 18~26 $\mu\textrm{m}$ in size. Oospore: aplerotic, globose, 16~24 $\mu\textrm{m}$ in size. Antheridium: amphigynous, unicellula, spherical. Chlamydospore: abundant, spherical, 16~32 $\mu\textrm{m}$ in size. Sexuality: heterothallic. Optimum growth temperature was about 25~$30^{\circ}C$. Pathogenicity of the isolate was confirmed on host plant and the fungus was identified as Phytophthora nicotianae. This is the first report of Phytophthora blight of Daphne odora in Korea.