Pub Date : 1999-06-01DOI: 10.1080/07060669909501210
D. Harder
In 1996, stem rusts of wheat and barley [Puccinia graminis f. sp. tritici] and oat [P. graminis f. sp. avenae] were light in eastern Canada, and in western Canada they were confined mainly to the Red River Valley of Manitoba, where maximum severities of 40% occurred in lines of susceptible wheat in nurseries. In 1997 only traces of stem rust were found on any host at any location. There were no infections in commercial wheat fields in 1996 or 1997. Only trace levels of stem rust were found in cultivated barley both years. There was no stem rust in commercial oat fields in 1996 or 1997. Infections in wild oat did not exceed 15% in either year and occurred only in Manitoba. In 1997, most isolates collected from cultivated or wild barley, and about one-half of those collected from wheat, were rye stem rust [P. graminis f. sp. secalis]. Pathotype identification was made on only 14 collections obtained from wheat, and on 19 from wild or cultivated barley in Manitoba in 1997. During both years, 24 pathotypes of...
{"title":"Stem rusts on wheat, barley, and oat in Canada in 1996 and 1997","authors":"D. Harder","doi":"10.1080/07060669909501210","DOIUrl":"https://doi.org/10.1080/07060669909501210","url":null,"abstract":"In 1996, stem rusts of wheat and barley [Puccinia graminis f. sp. tritici] and oat [P. graminis f. sp. avenae] were light in eastern Canada, and in western Canada they were confined mainly to the Red River Valley of Manitoba, where maximum severities of 40% occurred in lines of susceptible wheat in nurseries. In 1997 only traces of stem rust were found on any host at any location. There were no infections in commercial wheat fields in 1996 or 1997. Only trace levels of stem rust were found in cultivated barley both years. There was no stem rust in commercial oat fields in 1996 or 1997. Infections in wild oat did not exceed 15% in either year and occurred only in Manitoba. In 1997, most isolates collected from cultivated or wild barley, and about one-half of those collected from wheat, were rye stem rust [P. graminis f. sp. secalis]. Pathotype identification was made on only 14 collections obtained from wheat, and on 19 from wild or cultivated barley in Manitoba in 1997. During both years, 24 pathotypes of...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80421772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1080/07060669909501200
N. Zriba, J. Sherwood, D. Mathre
Selected fungi from a take-all suppressive wheat field in Montana were characterized morphologically and identified as Phialophora spp. Ribosomal DNA (rDNA) fragments from four Phialophora spp. and two known Gaeumannomyces isolates were amplified with polymerase chain reaction (PCR) using universal primers, cloned, and sequenced. Sequence comparison of the rDNA ITS regions revealed that these Phialophora isolates were not closely related to Gaeummanomyces sp. Alignment of the ITS sequences allowed the design of PCR primers that distinguished the Phialophora isolates from Gaeummanomyces sp. as well as Phialophora sp. related to Gaeummanomyces. Phialophora sp. 1-52 and Phialophora sp. 1-58 were tested alone and in combination for suppression of Gaeumannomyces graminis var. tritici in the field. When introduced on autoclaved canola seed, 1-52 proved to be an efficient biological control agent against wheat take-all disease in its original suppressive soil, as well as in a highly conducive soil. Isolate 1-58 ...
{"title":"Characterization and effectiveness of Phialophora spp. isolated from a Montana take-all suppressive soil in controlling take-all disease of wheat","authors":"N. Zriba, J. Sherwood, D. Mathre","doi":"10.1080/07060669909501200","DOIUrl":"https://doi.org/10.1080/07060669909501200","url":null,"abstract":"Selected fungi from a take-all suppressive wheat field in Montana were characterized morphologically and identified as Phialophora spp. Ribosomal DNA (rDNA) fragments from four Phialophora spp. and two known Gaeumannomyces isolates were amplified with polymerase chain reaction (PCR) using universal primers, cloned, and sequenced. Sequence comparison of the rDNA ITS regions revealed that these Phialophora isolates were not closely related to Gaeummanomyces sp. Alignment of the ITS sequences allowed the design of PCR primers that distinguished the Phialophora isolates from Gaeummanomyces sp. as well as Phialophora sp. related to Gaeummanomyces. Phialophora sp. 1-52 and Phialophora sp. 1-58 were tested alone and in combination for suppression of Gaeumannomyces graminis var. tritici in the field. When introduced on autoclaved canola seed, 1-52 proved to be an efficient biological control agent against wheat take-all disease in its original suppressive soil, as well as in a highly conducive soil. Isolate 1-58 ...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88879252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1080/07060669909501204
M. Medina, H. W. Platt
Studies were conducted in potato fields on Prince Edward Island (PE) and New Brunswick (NB) to determine the overwintering viability, germination, and infectivity of oospores of Phytophthora infestans. Oospore viability was determined using plasmolysis (4 M NaCl) and tetrazolium bromide (MTT) tests. After seven months exposure to winter conditions in potato fields, the viability of oospores buried on PE and NB ranged from 2.5 to 13% and from 1 to 28%, respectively, with the plasmolysis test and from 13 to 44% and from 2.5 to 40%, respectively, with the MTT test. In other studies on PE, oospore viability ranged from 5 to 15% 12 months after burial. In laboratory studies, oospores exposed to temperatures of -20 and -50°C for up to 90 days had viabilities greater than 50%, whereas exposure to 0, 4, or 15°C resulted in average viabilities from 23 to 36%. The lowest viability, 22%, was recorded at the highest temperature tested, 36°C. Oospore germination was low, ranging from 6 to 19%. However, this level was ...
{"title":"Viability of oospores of Phytophthora infestans under field conditions in northeastern North America","authors":"M. Medina, H. W. Platt","doi":"10.1080/07060669909501204","DOIUrl":"https://doi.org/10.1080/07060669909501204","url":null,"abstract":"Studies were conducted in potato fields on Prince Edward Island (PE) and New Brunswick (NB) to determine the overwintering viability, germination, and infectivity of oospores of Phytophthora infestans. Oospore viability was determined using plasmolysis (4 M NaCl) and tetrazolium bromide (MTT) tests. After seven months exposure to winter conditions in potato fields, the viability of oospores buried on PE and NB ranged from 2.5 to 13% and from 1 to 28%, respectively, with the plasmolysis test and from 13 to 44% and from 2.5 to 40%, respectively, with the MTT test. In other studies on PE, oospore viability ranged from 5 to 15% 12 months after burial. In laboratory studies, oospores exposed to temperatures of -20 and -50°C for up to 90 days had viabilities greater than 50%, whereas exposure to 0, 4, or 15°C resulted in average viabilities from 23 to 36%. The lowest viability, 22%, was recorded at the highest temperature tested, 36°C. Oospore germination was low, ranging from 6 to 19%. However, this level was ...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88718276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1080/07060669909501202
G.S. Mahuku, H.W. (Bud) Platt, P. Maxwell
A polymerase chain reaction (PCR) based assay that utilizes specific primers was compared with assays involving plating on selective agar media for its ability to detect and identify verticillium wilt pathogens of potato following artificial inoculations under field conditions. The common Verticillium species were detected in stem tissues and soil using both methods. The PCR assay was faster and efficient, requiring only 2 days for positive species identification, whereas the media-plating method required more than 4 weeks. Verticillium albo-atrum strain 1 (VA1) was the most frequently recovered species in soil and stems that were assayed using PCR and plating methods. However, the weakly pathogenic V. albo-atrum strain 2 (VA2) could not be differentiated from the more aggressive VA1 strain using the plating on media method. Verticillium tricorpus was detected at very low levels in plots that had been inoculated with this species, whereas VA2 was not detected in assayed potato stems using either method. H...
{"title":"Comparison of polymerase chain reaction based methods with plating on media to detect and identify verticillium wilt pathogens of potato","authors":"G.S. Mahuku, H.W. (Bud) Platt, P. Maxwell","doi":"10.1080/07060669909501202","DOIUrl":"https://doi.org/10.1080/07060669909501202","url":null,"abstract":"A polymerase chain reaction (PCR) based assay that utilizes specific primers was compared with assays involving plating on selective agar media for its ability to detect and identify verticillium wilt pathogens of potato following artificial inoculations under field conditions. The common Verticillium species were detected in stem tissues and soil using both methods. The PCR assay was faster and efficient, requiring only 2 days for positive species identification, whereas the media-plating method required more than 4 weeks. Verticillium albo-atrum strain 1 (VA1) was the most frequently recovered species in soil and stems that were assayed using PCR and plating methods. However, the weakly pathogenic V. albo-atrum strain 2 (VA2) could not be differentiated from the more aggressive VA1 strain using the plating on media method. Verticillium tricorpus was detected at very low levels in plots that had been inoculated with this species, whereas VA2 was not detected in assayed potato stems using either method. H...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87787634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1080/07060669909501198
J. Riebe
Genes for the production of various Bacillus thuringiensis (B.t.) proteins have been incorporated into plants through the techniques of biotechnology. Since 1995, corn, cotton, and potato seed products containing B.t. genes have been introduced to the market. Simultaneous to the development and introduction of B.t. plants, tremendous research efforts were made by industry, academic, and government scientists to devise product-specific insect resistance management (IRM) programs. IRM has become an essential part of the development and regulatory review process for B.t.-expressing plants, as distinct from other conventional chemistries. Despite this unprecedented effort, the long-term success of insect-protected crops or other pest control tools ultimately depends on the transfer of information to, and adoption by, individual growers, The effective implementation of proactive IRM plans will require integration and interaction between regulators, manufacturers of the technology, seed companies, agri-chemical...
{"title":"The development and implementation of strategies to prevent resistance to B.t.- expressing crops: an industry perspective","authors":"J. Riebe","doi":"10.1080/07060669909501198","DOIUrl":"https://doi.org/10.1080/07060669909501198","url":null,"abstract":"Genes for the production of various Bacillus thuringiensis (B.t.) proteins have been incorporated into plants through the techniques of biotechnology. Since 1995, corn, cotton, and potato seed products containing B.t. genes have been introduced to the market. Simultaneous to the development and introduction of B.t. plants, tremendous research efforts were made by industry, academic, and government scientists to devise product-specific insect resistance management (IRM) programs. IRM has become an essential part of the development and regulatory review process for B.t.-expressing plants, as distinct from other conventional chemistries. Despite this unprecedented effort, the long-term success of insect-protected crops or other pest control tools ultimately depends on the transfer of information to, and adoption by, individual growers, The effective implementation of proactive IRM plans will require integration and interaction between regulators, manufacturers of the technology, seed companies, agri-chemical...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83635094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1080/07060669909501207
K. R. Tiwari, T. Warkentin, G. Penner, J. Menzies
Erysiphe pisi, the causal agent of powdery mildew, is an important disease of field pea in western Canada, but very little information is available on whether or how it survives the winter in the prairie provinces. Therefore, studies were conducted of the role of cleistothecia on pea stubble, the possibility of seed transmission, and survival on other plant species. In 1996 and 1997 cleistothecia were abundantly formed on heavily infected plants in late August to September under field conditions. Microscopic observation during the winter indicated that by May more than 95% of the cleistothecia had degenerated under field conditions, whereas in samples stored at room temperature, 50% of the cleistothecia contained intact ascospores. When seeds from plants heavily infected with powdery mildew were grown in a greenhouse, none of the 4200 plants examined developed powdery mildew symptoms, suggesting that the possibility of transmission of E. pisi through infected seed is remote. When isolates of powdery milde...
{"title":"Studies on winter survival strategies of Erysiphe pisi in Manitoba","authors":"K. R. Tiwari, T. Warkentin, G. Penner, J. Menzies","doi":"10.1080/07060669909501207","DOIUrl":"https://doi.org/10.1080/07060669909501207","url":null,"abstract":"Erysiphe pisi, the causal agent of powdery mildew, is an important disease of field pea in western Canada, but very little information is available on whether or how it survives the winter in the prairie provinces. Therefore, studies were conducted of the role of cleistothecia on pea stubble, the possibility of seed transmission, and survival on other plant species. In 1996 and 1997 cleistothecia were abundantly formed on heavily infected plants in late August to September under field conditions. Microscopic observation during the winter indicated that by May more than 95% of the cleistothecia had degenerated under field conditions, whereas in samples stored at room temperature, 50% of the cleistothecia contained intact ascospores. When seeds from plants heavily infected with powdery mildew were grown in a greenhouse, none of the 4200 plants examined developed powdery mildew symptoms, suggesting that the possibility of transmission of E. pisi through infected seed is remote. When isolates of powdery milde...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74691418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1080/07060669909501203
R. Peters, H. W. Platt, R. Hall
During late blight surveys conducted from 1994 to 1996, hypotheses were developed to explain the migration of novel genotypes of Phytophthora infestans between regions or provinces via infected potato and tomato tissues and via winds of tropical storm systems. The appearance of isolates of the US-7 genotype in Alberta (a province affected predominantly by US-l) in 1994, was believed to be due to infected seed tubers from British Columbia. Similarly, the initial isolation of the US-8 genotype in Nova Scotia in 1995 and in Newfoundland in 1996 could be explained by the importation of infected potato seed tubers from other regions. The discovery of Al, metalaxyl-insensitive (glucose phosphate isomerase banding pattern = 100/]00/111; gll or US-ll) isolates of P. infestans in a tomato field in Ontario in 1996 (a province affected predominantly by US-8), suggested the introduction of this new strain had occurred via infected or infested tomato tissue. Circumstantial evidence was also obtained for the introducti...
{"title":"Hypotheses for the inter-regional movement of new genotypes of Phytophthora infestans in Canada","authors":"R. Peters, H. W. Platt, R. Hall","doi":"10.1080/07060669909501203","DOIUrl":"https://doi.org/10.1080/07060669909501203","url":null,"abstract":"During late blight surveys conducted from 1994 to 1996, hypotheses were developed to explain the migration of novel genotypes of Phytophthora infestans between regions or provinces via infected potato and tomato tissues and via winds of tropical storm systems. The appearance of isolates of the US-7 genotype in Alberta (a province affected predominantly by US-l) in 1994, was believed to be due to infected seed tubers from British Columbia. Similarly, the initial isolation of the US-8 genotype in Nova Scotia in 1995 and in Newfoundland in 1996 could be explained by the importation of infected potato seed tubers from other regions. The discovery of Al, metalaxyl-insensitive (glucose phosphate isomerase banding pattern = 100/]00/111; gll or US-ll) isolates of P. infestans in a tomato field in Ontario in 1996 (a province affected predominantly by US-8), suggested the introduction of this new strain had occurred via infected or infested tomato tissue. Circumstantial evidence was also obtained for the introducti...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80373098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-06-01DOI: 10.1080/07060669909501206
T. Olthof, Qing Yu
The effect of storage duration at low temperatures on numbers of the nematode Pratylenchus penetrans harbored within potato tubers of cvs. Superior, Monona, Saginaw, Saginaw Gold, Yukon Gold, and Kennebec were studied from 1992 to 1995. Numbers of P. penetrans in potato tubers held at 1-5?°C for 8 months decreased to nearly zero, regardless of cultivar. The number of nematodes decreased at different rates when stored at 3-5°C than when stored at 1-3°C and decreased most rapidly during the first 2 months of storage at 1-3°C; at 3-5°C storage, it took 4 months for the numbers to decrease substantially. The number of live nematodes in potato tubers after 8 months of storage below 5°C was too low to pose a significant threat at planting to already infested fields, but would still be a source of a new infestation.
{"title":"REDUCTION OF ROOT-LESION NEMATODES (PRATYLENCHUS PENETRANS) IN TUBERS OF POTATO (SOLANUM TUBEROSUM) DURING COLD STORAGE","authors":"T. Olthof, Qing Yu","doi":"10.1080/07060669909501206","DOIUrl":"https://doi.org/10.1080/07060669909501206","url":null,"abstract":"The effect of storage duration at low temperatures on numbers of the nematode Pratylenchus penetrans harbored within potato tubers of cvs. Superior, Monona, Saginaw, Saginaw Gold, Yukon Gold, and Kennebec were studied from 1992 to 1995. Numbers of P. penetrans in potato tubers held at 1-5?°C for 8 months decreased to nearly zero, regardless of cultivar. The number of nematodes decreased at different rates when stored at 3-5°C than when stored at 1-3°C and decreased most rapidly during the first 2 months of storage at 1-3°C; at 3-5°C storage, it took 4 months for the numbers to decrease substantially. The number of live nematodes in potato tubers after 8 months of storage below 5°C was too low to pose a significant threat at planting to already infested fields, but would still be a source of a new infestation.","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82694068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10600130
H. R. Kutcher, K. Mortensen
Abstract Colletotrichum gloeosporioides f. sp. malvae (C.g. malvae) is pathogenic on velvetleaf (Abutilon theophrasti) but does not cause sufficient damage or mortality to be considered as a biological control agent for this weed. Velvetleaf control might be increased if isolates of C.g. malvae with greater pathogenicity could be identified. C.g. malvae isolates from Saskatchewan, Manitoba, and Ontario (Canada) were examined to determine their genotypic and pathogenic variation. The random amplified polymorphic DNA (RAPD) technique was used to determine differences among isolates based on the presence or absence of amplified DNA fragments. Isolates were also tested for variation in pathogenicity by stem injection of the pathogen into velvetleaf plants under controlled conditions. All isolates of C.g. malvae were highly pathogenic on velvetleaf. Differences in RAPD patterns were not obtained among C.g. malvae isolates. However, differences in RAPD patterns could be used to differentiate isolates of C.g. ma...
{"title":"Genotypic and pathogenic variation of Colletotrichum gloeosporioides f.sp. malvae.","authors":"H. R. Kutcher, K. Mortensen","doi":"10.1080/07060661.1999.10600130","DOIUrl":"https://doi.org/10.1080/07060661.1999.10600130","url":null,"abstract":"Abstract Colletotrichum gloeosporioides f. sp. malvae (C.g. malvae) is pathogenic on velvetleaf (Abutilon theophrasti) but does not cause sufficient damage or mortality to be considered as a biological control agent for this weed. Velvetleaf control might be increased if isolates of C.g. malvae with greater pathogenicity could be identified. C.g. malvae isolates from Saskatchewan, Manitoba, and Ontario (Canada) were examined to determine their genotypic and pathogenic variation. The random amplified polymorphic DNA (RAPD) technique was used to determine differences among isolates based on the presence or absence of amplified DNA fragments. Isolates were also tested for variation in pathogenicity by stem injection of the pathogen into velvetleaf plants under controlled conditions. All isolates of C.g. malvae were highly pathogenic on velvetleaf. Differences in RAPD patterns were not obtained among C.g. malvae isolates. However, differences in RAPD patterns could be used to differentiate isolates of C.g. ma...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88962504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-03-01DOI: 10.1080/07060661.1999.10599969
G. Chongo, C. C. Bernier
Abstract The components of panial resistance to anthracnose (Colletotrichum truncatum) were evaluated in lentil (Lens culinaris) in a growth chamber and in the field. Lines PI 299331, PI 320937, PI 345629, 458-57, and cv. Indianhead, with different levels of panial resistance and the susceptible cultivar Eston were inoculated in a growth chamber and in the field using a single virulent isolate of C truncatum. Incubation and latent periods as well as sporulating lesions were measured on stems. A computer imaging system was used to measure lesion number, lesion size, and percent necrotic area per square centimetre on stem samples. Area under the disease progress curve (AUDPC) values were also calculated using disease severity from the field samples. Lines PI 320937, PI 345629, 458-57, and cv. Indianhead were found to have high levels of partial resistance, as indicated by significantly smaller and fewer lesions and longer incubation and latent periods than cv. Eston. For each component, PI 299331 was interm...
摘要在生长室内和田间对扁豆(Lens culinaris)抗炭疽病(Colletotrichum truncatum)的成分进行了评价。行PI 299331, PI 320937, PI 345629, 458-57，和cv。用一株强毒分离株在室内和田间分别接种不同抗蚜水平的印度头菌和敏感品种Eston。在茎上测量了潜伏期和潜伏期以及孢子病变。计算机成像系统用于测量病变数量、病变大小和茎样每平方厘米坏死面积百分比。利用田间样品的疾病严重程度计算疾病进展曲线下面积(AUDPC)值。行PI 320937, PI 345629, 458-57，和cv。发现印度头虱具有高水平的部分抗性，这表明病变明显更小，更少，潜伏期和潜伏期比cv更长。Eston。对于每个部件，PI 299331是临时的…
{"title":"Field and growth chamber evaluation of components of partial resistance to Colletotrichum truncatum in lentil","authors":"G. Chongo, C. C. Bernier","doi":"10.1080/07060661.1999.10599969","DOIUrl":"https://doi.org/10.1080/07060661.1999.10599969","url":null,"abstract":"Abstract The components of panial resistance to anthracnose (Colletotrichum truncatum) were evaluated in lentil (Lens culinaris) in a growth chamber and in the field. Lines PI 299331, PI 320937, PI 345629, 458-57, and cv. Indianhead, with different levels of panial resistance and the susceptible cultivar Eston were inoculated in a growth chamber and in the field using a single virulent isolate of C truncatum. Incubation and latent periods as well as sporulating lesions were measured on stems. A computer imaging system was used to measure lesion number, lesion size, and percent necrotic area per square centimetre on stem samples. Area under the disease progress curve (AUDPC) values were also calculated using disease severity from the field samples. Lines PI 320937, PI 345629, 458-57, and cv. Indianhead were found to have high levels of partial resistance, as indicated by significantly smaller and fewer lesions and longer incubation and latent periods than cv. Eston. For each component, PI 299331 was interm...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79782567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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