Pub Date : 1998-12-01DOI: 10.1080/07060669809500400
R. Sturrock, G. Reynolds
The efficacy of a novel inoculation technique for infecting conifer seedling roots with Phellinus weirii was demonstrated, Inoculum units were prepared from P. weirii-colonized stem segments of red alder (Alnus rubra) and branch segments of Douglas-fir (Pseudotsuga menziesii). In one experiment, potted and outplanted seedlings of nine coniferous species of known susceptibility to P. weirii (Douglas-fir, grand fir, lodgepole pine, noble fir, Sitka spruce, western hemlock, western redcedar, western white pine, and yellow cedar) were inoculated using the novel inoculum units. For all nine species combined, transfer of ectotrophic P. weirii was greater for potted seedlings than for outplanted seedlings (93% vs. 48%). However, rates of endotrophic P. weirii infection were similar for potted and outplanted seedlings (81% and 77% respectively). Results of this experiment parallel reported species susceptibility to P. weirii. In a second experiment, rooted cuttings of English yew and Pacific yew, coniferous speci...
{"title":"A new technique for inoculation of conifer seedling roots with the laminated root rot pathogen, Phellinus weirii","authors":"R. Sturrock, G. Reynolds","doi":"10.1080/07060669809500400","DOIUrl":"https://doi.org/10.1080/07060669809500400","url":null,"abstract":"The efficacy of a novel inoculation technique for infecting conifer seedling roots with Phellinus weirii was demonstrated, Inoculum units were prepared from P. weirii-colonized stem segments of red alder (Alnus rubra) and branch segments of Douglas-fir (Pseudotsuga menziesii). In one experiment, potted and outplanted seedlings of nine coniferous species of known susceptibility to P. weirii (Douglas-fir, grand fir, lodgepole pine, noble fir, Sitka spruce, western hemlock, western redcedar, western white pine, and yellow cedar) were inoculated using the novel inoculum units. For all nine species combined, transfer of ectotrophic P. weirii was greater for potted seedlings than for outplanted seedlings (93% vs. 48%). However, rates of endotrophic P. weirii infection were similar for potted and outplanted seedlings (81% and 77% respectively). Results of this experiment parallel reported species susceptibility to P. weirii. In a second experiment, rooted cuttings of English yew and Pacific yew, coniferous speci...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":"53 18 1","pages":"324-330"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80912349","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 : 1998-12-01DOI: 10.1080/07060669809500390
Hai Yu, J. Sutton
Control of Botrytis cinerea by Gliocladium roseum was investigated in detached raspberry shoots maintained in high humidity. Sporulation incidence of B. cinerea in leaf disks, stem segments, stamens, and pistils respectively from shoots inoculated with 103, 104. 105, and 106 conidia of the pathogen mL-1 increased from 13 to 100%, 7 to 100%, 38 to 100%, and 6 to 94%. When shoots were challenge-inoculated after 24 h with 104 to 108 conidia of G. roseum mL-1, in all combinations, sporulation of the pathogen was suppressed completely in leaves, and by > 97% in stems when density of the antagonist was 107 conidia mL-1. Sporulation of the pathogen in stamens and pistils was suppressed more effectively when density of the antagonist was proportionately high. G. roseum developed more extensively in leaves and stamens when postinoculation wetness lasted at least 12 to 24 h at 20 to 30°C, and controlled sporulation of B. cinerea more effectively when conditions allowed the antagonist to establish endophytically. Po...
{"title":"Effects of inoculum density, wetness duration, and temperature on control of Botrytis cinerea by Gliocladium roseum in raspberry","authors":"Hai Yu, J. Sutton","doi":"10.1080/07060669809500390","DOIUrl":"https://doi.org/10.1080/07060669809500390","url":null,"abstract":"Control of Botrytis cinerea by Gliocladium roseum was investigated in detached raspberry shoots maintained in high humidity. Sporulation incidence of B. cinerea in leaf disks, stem segments, stamens, and pistils respectively from shoots inoculated with 103, 104. 105, and 106 conidia of the pathogen mL-1 increased from 13 to 100%, 7 to 100%, 38 to 100%, and 6 to 94%. When shoots were challenge-inoculated after 24 h with 104 to 108 conidia of G. roseum mL-1, in all combinations, sporulation of the pathogen was suppressed completely in leaves, and by > 97% in stems when density of the antagonist was 107 conidia mL-1. Sporulation of the pathogen in stamens and pistils was suppressed more effectively when density of the antagonist was proportionately high. G. roseum developed more extensively in leaves and stamens when postinoculation wetness lasted at least 12 to 24 h at 20 to 30°C, and controlled sporulation of B. cinerea more effectively when conditions allowed the antagonist to establish endophytically. Po...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":"54 1","pages":"243-252"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84364347","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 : 1998-12-01DOI: 10.1080/07060669809500405
W. Bockus
{"title":"CONTROL STRATEGIES FOR STUBBLE-BORNE PATHOGENS OF WHEAT","authors":"W. Bockus","doi":"10.1080/07060669809500405","DOIUrl":"https://doi.org/10.1080/07060669809500405","url":null,"abstract":"","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":"39 1","pages":"371-375"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81919627","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 : 1998-12-01DOI: 10.1080/07060669809500410
L. Lamari, J. Gilbert, A. Tekauz
{"title":"RACE DIFFERENTIATION IN PYRENOPHORA TRITICI-REPENTIS AND SURVEY OF PHYSIOLOGIC VARIATION IN WESTERN CANADA","authors":"L. Lamari, J. Gilbert, A. Tekauz","doi":"10.1080/07060669809500410","DOIUrl":"https://doi.org/10.1080/07060669809500410","url":null,"abstract":"","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":"26 1","pages":"396-400"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77065357","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 : 1998-12-01DOI: 10.1080/07060669809500409
E. Wolf, L. Francl
{"title":"Empirical infection period models for tan spot of wheat","authors":"E. Wolf, L. Francl","doi":"10.1080/07060669809500409","DOIUrl":"https://doi.org/10.1080/07060669809500409","url":null,"abstract":"","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":"23 1","pages":"394-395"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79228714","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 : 1998-12-01DOI: 10.1080/07060669809500397
Qing Yu, J. Potter, G. Gilby
One hundred thirty-five soil samples, collected from 15 golfcourses throughout southern Ontario in 1995, 1997, and 1998 were analysed for the presence of plant-parasitic nematodes. Criconemoides spp., Helicotylenchus spp., Heterodera spp., Hoplolaimus spp., Meloidogyne spp., Paratylenchus spp., Pratylenchus spp., Tylenchorhynchus spp., and Xiphinema spp. were recorded. The ring nematodes, Criconemoides spp., and the pin nematodes, Paratylenchus spp., were present in all 15 golf courses. The lesion nematodes, Pratylenchus spp., and the spiral nematodes, Helicotylenchus spp., were present in 14 courses. The lance nematodes, Hoplolaimus spp., were present in 13 courses. The stunt nematodes, Tylenchorhynchus spp., were present in 12 golf courses. Four species of the lesion nematode were recorded: Pratylenchus crenatus, P. neglectus, P. fallax, and P. thornei. This is the first report of P. fallax in Ontario, and the first detection of P. thornei on turf in the province.
{"title":"Plant-parasitic nematodes associated with turfgrass in golf courses in southern Ontario","authors":"Qing Yu, J. Potter, G. Gilby","doi":"10.1080/07060669809500397","DOIUrl":"https://doi.org/10.1080/07060669809500397","url":null,"abstract":"One hundred thirty-five soil samples, collected from 15 golfcourses throughout southern Ontario in 1995, 1997, and 1998 were analysed for the presence of plant-parasitic nematodes. Criconemoides spp., Helicotylenchus spp., Heterodera spp., Hoplolaimus spp., Meloidogyne spp., Paratylenchus spp., Pratylenchus spp., Tylenchorhynchus spp., and Xiphinema spp. were recorded. The ring nematodes, Criconemoides spp., and the pin nematodes, Paratylenchus spp., were present in all 15 golf courses. The lesion nematodes, Pratylenchus spp., and the spiral nematodes, Helicotylenchus spp., were present in 14 courses. The lance nematodes, Hoplolaimus spp., were present in 13 courses. The stunt nematodes, Tylenchorhynchus spp., were present in 12 golf courses. Four species of the lesion nematode were recorded: Pratylenchus crenatus, P. neglectus, P. fallax, and P. thornei. This is the first report of P. fallax in Ontario, and the first detection of P. thornei on turf in the province.","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":"29 1","pages":"304-307"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82041147","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 : 1998-12-01DOI: 10.1080/07060669809500407
M. R. Fernandez, R. DePauw, J. Clarke, S. Fox
{"title":"Discoloration of wheat kernels by Pyrenophora tritici-repentis","authors":"M. R. Fernandez, R. DePauw, J. Clarke, S. Fox","doi":"10.1080/07060669809500407","DOIUrl":"https://doi.org/10.1080/07060669809500407","url":null,"abstract":"","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":"13 1","pages":"380-383"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78957116","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 : 1998-12-01DOI: 10.1080/07060669809500395
J. W. Chan, S. Maynard, P. Goodwin
A putative two-component signal transduction system was amplified and cloned from the plant pathogenic bacterium Xanthomonas campestris pv. phaseoli var. fuscans isolate BXPF65. The 620 bp amplified fragment was sequenced and analyzed with the BLAST Enhanced Alignment Utility (BEAUTY). BEAUTY analysis indicates that the putative xanthomonad response regulator contains regions which matched to an ATP phosphorylation site, a σ54-factor interaction domain, and the “receiver” domains of various transcriptional regulators of the two-component signal transduction systems. Similar analysis indicates that the putative histidine kinase has homology with conserved “transmitter” domains of sensor proteins in two-component signal transduction systems. RFLP analysis using the putative signal transduction system showed polymorphisms among the strains.
{"title":"CLONING OF A TWO-COMPONENT SIGNAL TRANSDUCTION SYSTEM OF XANTHOMONAS CAMPESTRIS PV. PHASEOLI VAR.FUSCANS STRAIN BXPF65","authors":"J. W. Chan, S. Maynard, P. Goodwin","doi":"10.1080/07060669809500395","DOIUrl":"https://doi.org/10.1080/07060669809500395","url":null,"abstract":"A putative two-component signal transduction system was amplified and cloned from the plant pathogenic bacterium Xanthomonas campestris pv. phaseoli var. fuscans isolate BXPF65. The 620 bp amplified fragment was sequenced and analyzed with the BLAST Enhanced Alignment Utility (BEAUTY). BEAUTY analysis indicates that the putative xanthomonad response regulator contains regions which matched to an ATP phosphorylation site, a σ54-factor interaction domain, and the “receiver” domains of various transcriptional regulators of the two-component signal transduction systems. Similar analysis indicates that the putative histidine kinase has homology with conserved “transmitter” domains of sensor proteins in two-component signal transduction systems. RFLP analysis using the putative signal transduction system showed polymorphisms among the strains.","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":"1120 1","pages":"288-295"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80863678","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 : 1998-12-01DOI: 10.1080/07060669809500393
Z. Punja, H. Förster, I. Cunningham, M. Coffey
Isolates of Phytophthora infestans were collected from British Columbia at various times during 1993-1997 and from eight other provinces in Canada during 1993-1995 and characterized for mating type (either Al or A2), growth response to metalaxyl (either sensitive-MS or insensitive-MI), and random amplified polymorphic DNA (RAPD) patterns. Among the isolates tested, 312 were from diseased potato cultivars, while 14 originated from tomato or hairy nightshade plants with blight symptoms. A composite of RAPD patterns generated by nine primers following PCR amplification was used to identify novel genotypes based on presence of polymorphic bands. The occurrence in Canada of genotypes that corresponded to US I, US 6, US 7, and US 8 was confirmed during this study. The RAPD primers also identified 15 novel genotypes from British Columbia (BC) and 4 from New Brunswick, regions in which both Al and A2 mating types of P. infestans have previously been found and oospore production reported. In 1993, genotypes US 6 a...
{"title":"Genotypes of the late blight pathogen (Phytophthora infestans) in British Columbia and other regions of Canada during 1993-1997","authors":"Z. Punja, H. Förster, I. Cunningham, M. Coffey","doi":"10.1080/07060669809500393","DOIUrl":"https://doi.org/10.1080/07060669809500393","url":null,"abstract":"Isolates of Phytophthora infestans were collected from British Columbia at various times during 1993-1997 and from eight other provinces in Canada during 1993-1995 and characterized for mating type (either Al or A2), growth response to metalaxyl (either sensitive-MS or insensitive-MI), and random amplified polymorphic DNA (RAPD) patterns. Among the isolates tested, 312 were from diseased potato cultivars, while 14 originated from tomato or hairy nightshade plants with blight symptoms. A composite of RAPD patterns generated by nine primers following PCR amplification was used to identify novel genotypes based on presence of polymorphic bands. The occurrence in Canada of genotypes that corresponded to US I, US 6, US 7, and US 8 was confirmed during this study. The RAPD primers also identified 15 novel genotypes from British Columbia (BC) and 4 from New Brunswick, regions in which both Al and A2 mating types of P. infestans have previously been found and oospore production reported. In 1993, genotypes US 6 a...","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":"8 1","pages":"274-282"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84620285","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 : 1998-06-01DOI: 10.1080/07060669809500428
J. Kimpinski, H. Johnston, J. Sanderson
{"title":"Effects of carbathiin and thiram with propiconazole and aldicarb on grain yield, and on incidence of root rot, leaf blotch, and root lesion nematode in spring wheat","authors":"J. Kimpinski, H. Johnston, J. Sanderson","doi":"10.1080/07060669809500428","DOIUrl":"https://doi.org/10.1080/07060669809500428","url":null,"abstract":"","PeriodicalId":9607,"journal":{"name":"Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie","volume":"36 1","pages":"201-205"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74159743","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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