• Title, Summary, Keyword: red pepper anthracnose

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Control Effects of 3-(4-Hydroxyphenyl)-propionic Acid Isolated Xenorhabdus nematophila K1 against Phytophthora Blight and Anthracnose of Red Pepper (Xenorhabdus nematophila K1 대사물질 3-(4-hydroxyphenyl)-propionic acid의 고추 역병과 탄저병에 대한 방제 효과)

  • Cheon, Wonsu;Kim, Doyeon;Kim, Yonggyun;Hong, Yong Pyo;Yi, Youngkeun
    • Research in Plant Disease
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    • v.19 no.3
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    • pp.208-215
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    • 2013
  • 3-(4-Hydroxyphenyl)-propionic acid (HPP) is a bacterial metabolite synthesized and released by an entomopathogenic bacterium Xenorhabdus nematophila K1. In this study, the control efficacy of HPP was tested against Phytophthora blight and anthracnose of red pepper plants. HPP suppressed mycelial growth of Phytophthora blight and anthracnose pathogens. Under natural sunlight condition, HPP maintained the antifungal activity on the diseases for at least twenty five days. The antifungal activity was not decreased even in the condition of soil-water. It was proved that HPP was able to penetrate the roots and travel upward of the red pepper plants. When HPP suspension was applied to soil rhizosphere before transplanting the red pepper seedlings or was regularly sprayed to the foliage of the plants with ten days interval, it resulted in significant reduction of the disease occurrences (Phytophthora blight and anthracnose) without any phytotoxicity. These results suggested that HPP can be developed to a systemic agrochemical against Phytophthora blight and anthracnose of red pepper plants.

Occurrence and Ecological Characteristics of Red Pepper Anthracnose (고추 탄저병의 발병 생태 특성)

  • Kwon, Cheon-Sub;Lee, Soon-Gu
    • Research in Plant Disease
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    • v.8 no.2
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    • pp.120-123
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    • 2002
  • Occurrence of anthracnose on red pepper fruit was examined at 6 red pepper-growing regions including Yecheon, Andong, Euisong, Cheongsong, and Ponghwa in Kyungbuk province, Korea in 1999. The disease occurred firstly June 13 at Cheongsong, progressed gradually thereafteri and increased rapidly from late August. The average disease incidence with mid September was 30.4%. There was no significant difference in disease incidence among the regions examined. Correlation coefficient analysis of the disease incidence with weather factors revealed that it was significantly related to relative humidity, precipitation, rainy days, and duration of continuous rainy days. Most fungal isolates from the diseased fruit were Colletotichum gloeosporioides. In the in field experiment, unmature fruit was somewhat more susceptible to the disease than mature fruit. In the field experiment, the disease occurred severely in open fields, having the disease incidence of 12.1%; however, no disease was observed in the rain-proof fields. The anthracnose on red pepper fruit developed earlier and more severely in the successive cropping field with red pepper than the field having other crops. Removal of infected plant debris also delayed and reduced the disease occurrence, suggesting that plant debris infested with the anthracnose fungus serve as a primary inoculum source which may govern the severity of the disease in the field.

Red Pepper Anthracnose: Colletotrichum gloeosporioides, It's Cultural Variations and Pathogenicity (고추 탄저병균의 배양형 변이 그리고 병원성 차이)

  • Im, Jin-Hyun;Lee, Soon-Gu
    • Research in Plant Disease
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    • v.10 no.3
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    • pp.203-208
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    • 2004
  • The dominant isolates of Colletotrichum gloeosporioides from the red pepper anthracnose(both of the diseased plants and debris) was more pathogenic than the isolates of Colletotrichum acutatum of minorly isolated from Gyeong-buk, Korea. There were both of the G and R strains of cultural variants of Colletotrichum gloeosporioides, the G strain was more pathogenic than R strain. The cultivars of red-pepper, cv. 'Kumsegi' was the most susceptible and cv. 'papet' was the least susceptible in the pathogenicity test. The isolates of Colletotrichum gloeosporioides from other host plant such on sesame, safflower, yam, strawberry could infect to the red pepper plant also.

Effect of Polyvinyl Tunnel after Mulching on the Occurrence of Phytophthora Blight and Anthracnose of Red Pepper (비닐터널 유인재배가 고추 역병과 탄저병의 발생에 미치는 효과)

  • Cheong, Seong-Soo;Kim, Ju-Hee;Choi, Dong-Chil
    • Research in Plant Disease
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    • v.16 no.1
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    • pp.106-108
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    • 2010
  • This survey was conducted to investigate effect of covering with polyvinyl ($120{\times}90cm$) on incidence of Phytophthora blight and anthracnose and growth. Early growth of pepper plant was superior when was covered with polyvinyl after planting. Incidence of anthracnose and Phytophthora blight was lower 26.9% and 60.3% in covering system than those in conventional culture system, respectively. A yield of dried red pepper was more 48.5% in cultured with covering system than that in conventional culture system.

Control Effects of Indole Isolated from Xenorhabdus nematophila K1 on the Diseases of Red Pepper (Xenorhabdus nematophila K1 유래물질 인돌의 고추 병해 방제 효과)

  • Jeon, Mi-Hyeon;Cheon, Won-Su;Kim, Yong-Gyun;Hong, Yong-Pyo;Yi, Young-Keun
    • Research in Plant Disease
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    • v.18 no.1
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    • pp.17-23
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    • 2012
  • Indole compound is a bacterial metabolite synthesized and released by an entomopathogenic bacterium, Xenorhabdus nematophila K1. The antibiotic activity was evaluated against plant pathogens, such as Phytophthora blight and anthracnose of red pepper. Indole significantly suppressed mycelial growth of Phytophthora blight and anthracnose pathogens. Under natural sunlight conditions, indole maintained the antifungal activity for at least sixty days. The activity was not affected under the condition of soil-water. When the indole suspension was applied to surface soil before transplanting of red pepper seedlings and was then regularly sprayed to the foliage of the plants with ten days interval, it resulted in significant reduction of the disease occurrences (Phytophthora blight, anthracnose, soft rot, and black mold) by about 30%. These results suggest that indole can be used to control Phytophthora blight and anthracnose of red pepper.

Evaluation on Red Pepper Germplasm lines (Capsicum spp.) for Resistance to Anthracnose Caused by Colletotrichum acutaum

  • Kim, Jeong-Soon;Jee, Hyeong-Jin;Gwag, Jae-Gyun;Kim, Chung-Kon;Shim, Chang-Ki
    • The Plant Pathology Journal
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    • v.26 no.3
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    • pp.273-279
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    • 2010
  • We evaluated 209 Capsicum accessions from the National Agrobiodiversity of RDA, for their reaction against of anthracnose disease caused by Colletotrichum acutatum. Two hundred nine accessions of Capsicum were almost composed with Capsicum annuum var. annuum originated from 37 countries. The percentage of infection due to C. acutatum ranged from 11.1% to 100% on immature and matured pepper fruits at 21 days after inoculation. On immature fruits of pepper, one hundred seventy three accessions of tested pepper were found infected with C. acutatum. Out of the 173 accessions, eighty five accessions were susceptible to anthracnose with dark brown to black lesions and slowly increased in size at 21 days after inoculation. Only thirty six accessions showed resistance against C. acutatum. On mature fruits of pepper, one hundred ninety eight accessions were infected with C. acutatum at 21 days after inoculation. Twenty one accessions showed a resistance reaction against C. acutatum. The results of this work indicated that all of resistance accessions to C. acutatum were have a genetic potential for the resources of resistance can be further used in pepper breeding programme against anthracnose and also demand more detailed investigation in this.

Antifungal Activity Against Colletotrichum spp. of Curcuminoids Isolated from Curcuma longa L. Rhizomes

  • Cho Jun-Young;Choi Gyung-Ja;Lee Seon-Woo;Jang Kyoung-Soo;Lim He-Kyoung;Lim Chi-Hwan;Lee Sun-Og;Cho Kwang-Yun;Kim Jin-Cheol
    • Journal of Microbiology and Biotechnology
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    • v.16 no.2
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    • pp.280-285
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    • 2006
  • Methanol extract of the rhizomes of turmeric, Curcuma longa L., effectively controlled the development of red pepper anthracnose caused by Colletotrichum coccodes. In addition three antifungal substances were identified from the methanol extract of C. longa rhizomes as curcumin, demethoxycurcumin, and bisdemethoxycurcumin using mass and $^{1}H-NMR$ spectral analyses. The curcuminoids in a range $0.4-100\;{\mu}g/ml$ effectively inhibited the mycelial growth of three red pepper anthracnose pathogens, C. coccodes, C. gloeosporioides, and C. acutatum. The three curcuminoids inhibited mycelial growth of C. coccodes and C. gloeosporioides to an extent similar to the synthetic fungicide dithianon did, but the synthetic agent was a little more effective against C. acutatum. The curcuminoids also effectively inhibited spore germination of C. coccodes, and bisdemethoxycurcumin was the most active. Among the three curcuminoids, only demethoxycurcumin was effective in a greenhouse test in suppressing red pepper anthracnose caused by C. coccodes.

Control of Red Pepper Anthracnose Using Bacillus subtilis YGB36, a Plant Growth Promoting Rhizobacterium (식물생장촉진근권세균 Bacillus subtilis YGB36을 이용한 고추 탄저병의 생물학적 방제)

  • Lee, Yong Yoon;Lee, Younmi;Kim, Young Soo;Kim, Hyun Sup;Jeon, Yongho
    • Research in Plant Disease
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    • v.26 no.1
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    • pp.8-18
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    • 2020
  • Red pepper, one of the major economic crops in Korea, is being affected by anthracnose disease caused by Colletotrichum acutatum. To control this disease, an antagonistic bacterial strain, Bacillus subtilis YGB36 identified by 16S rDNA sequencing, physiological and biochemical analyses is used as a biological control agent. In vitro screening revealed that the strain YGB36 possess strong antifungal activity against the pathogen Cylindrocarpon destructans. The strain exhibited cellulase, protease, amylase, siderophore production and phosphate solubility. In vitro conidial germination of C. acutatum was most drastically inhibited by YGB36 cell suspensions (106 cfu/ml) or culture filtrate. Development of anthracnose symptoms was reduced on detached immature green pepper fruits by treatment with cell suspensions, and its control value was recorded as 65.7%. The YGB36 bacterial suspension treatment enhanced the germination rate of red pepper seeds and promoted root development and growth under greenhouse conditions. The in vitro screening of fungicide and insecticide sensitivity test against YGB36 revealed that the bacterial growth was not affected by any of the insecticides, and 11 fungicides out of 21 used. Collectively, our results clearly suggest that the strain YGB36 is considered as one of the potential biocontrol agents against anthracnose disease in red pepper.

Effect of Temperature, Relative Humidity, and Free Water Period on Lesion Development and Acervulus Formation of Colletotrichum gloeosporioides on Red Pepper (고추 탄저병 Colletotrichum gloeosporioides의 병반 및 분생자층 형성에 미치는 온도, 상대습도 및 수분 지속기간의 영향)

  • 박경석;김충회
    • Korean Journal Plant Pathology
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    • v.10 no.1
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    • pp.34-38
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    • 1994
  • Effect of temperature, relative humidity (RH) and free water period on anthracnose development by Colletotrichum gloeosporioides was examined on red pepper fruits. Mycelial growth of C. gloeosporioides was best at 28$^{\circ}C$, but greatly retarded at 32$^{\circ}C$. Minimum inoculum density required for lesion development varied with isolates, but was mostly above 1.0$\times$105 conidia/ml. Optimum temperature for lesion development on fruits was 31$^{\circ}C$. Percentage of lesion development was decreased as incubation temperature decreased. similar trend of temperature response was observed for acervulus formation on the developed lesions. Acervuli were not developed on the lesion as low as at 19$^{\circ}C$. Lesion development and acervuli formation tended to increase as increasing RH, but were greatly inhibited at the RH lower than 88%. More than 2 hours of free water period after inoculation were required for lesion development. Lesion development was increased as free water period increased. This study indicates that anthracnose development by C. gloeosporioides favors the conditions of high temperature above 28$^{\circ}C$, high humidity above 90% RH, and requires free water period longer than 2 hours.

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Seed-borne Infection of Anthracnose Fungi Isolated from Diseased Red Pepper (병든 고추 종자에서 분리된 탄저병균의 종자전염)

  • Lee, Du-Hyung
    • The Korean Journal of Mycology
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    • v.23 no.2
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    • pp.114-120
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    • 1995
  • Colletotrichum dematium, C. gloeosporioides and Glomerella cingulata were detected in seed samples collected from diseased red pepper (Capsicum annuum) using blotter method. C. gloeosporioides was the predominant species in seed samples tested and followed by C. dematium and G. cingulata. When the seed components were plated C. dematium, C. gloeosporioides and G. cingulata were detected from seed coat, endosperm and cotyledon. The three anthracnose fungi were recorded more frequently from seed coat than that of observed in the endosperm and cotyledon. Seed infection with C. dematium, C. gloeosporioides and G. cingulata caused seed rotting, damping off and seedling blight of red pepper plants. According to the inoculation experiments, it was shown that C. gloeosporioides was the most virulent among three species. C. dematium showed weak virulence when the plants were wounded, and G. cingulata was wound parasite or weakly virulent on red fruits. Benlate T (benomyl+thiram) and Homai (thiophnate-methyl+thiram) were effective to anthracnose fungi when treated to infected seeds.

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