Abstracts of papers presented at the annual meeting of the Canadian Phytopathological Society University of British Columbia, Vancouver 14-17 August 1988

Abstract

Soil type and host species affect root rot caused by Alberta isolates of the Armillaria mellea complex. P.V. Blenis, M.S. Mugala, Y. Hiratsuka, and K.l. Mallett. Department of Plant Science, University of Alberta, Edmonton, Alberta T6G 2P5; and (Y.H. and K.I.M.) Canadian Forestry Service, Northern Forestry Centre, 5320 122 Street. Edmonton, Alberta T6H 3S5. Hypovirulence in Sclerotinia sclerotiorum associated with double-stranded RNA. G.J. Boland. Department of Environmental Biology, University of Guelph, Guelph, Ontario NIG2W1. Anthracnose of alfalfa in Ontario. G.J. Boland and L.D Brochu. Department of Environmental Biology, University of Guelph, Guelph, Ontario NIG 2WI. The effect of VA mycorrhizal fungi on infection by Bipolaris sorokiniana in barley. S.M. Boyetchko and J.P. Tewari. Department of Plant Science, University of Alberta, Edmonton, Alberta T6G 2P5. An occurrence of fusarium crown and root rot disease in field-grown processing tomatoes in Ontario, Canada. R.A. Brammall and A.W. McKeown. Horticultural Research Institute of Ontario, Horticultural Experiment Station, Box 587, Simcoe, Ontario N3Y4N5. A microcomputer program to calculate various foliar disease parameters in epidemiology. O. Carisse and A.C Kushalappa. Department of Plant Science, Macdonald College of McGill University, Ste. Anne de Bellevue, Quebec H9X 1C0. Association of phoma canker with photocarcinogenic furocoumarins in parsnip root tissue. R.F. Cerkauskas and M. Chiba. Research Station, Agriculture Canada, Vineland Station, Ontario LOR 2E0. Elicitation of phytoalexins in the roots of canola and Camelina sativa seedlings in response to Rhizoctonia solani. K.L. Conn, J.P. Tewari, and J.S. Dahiya. Department of Plant Science, University of Alberta, Edmonton, Alberta T6G2P5. Increased yields from cross protected, fusarium crown and root rot infected tomato plants grown in sawdust culture. R.J. Copeman, B.E. Mauza, and G.W. Eaton. Plant Science Department, University of British Columbia, Vancouver, British Columbia V6T2A2 and British Columbia Ministry of Agriculture and Fisheries, Abbotsford, British Columbia V2S1K2. Epidemiology and control of cytospora dieback of stone fruits in the Okanagan Valley of British Columbia. T.P. Cujec, R.J. Copeman, and P.L. Sholberg. Plant Science Department, University of British Columbia, Vancouver, British Columbia V6T2A2 and Research Station, Agriculture Canada, Summer/and, British Columbia VOH 1Z0. Comparative studies of luteovirus purification methods. C.J. D'Arcy, R.R. Martin, and S. Spiegel. University of Illinois, Urbana-Champaign, II, 61801; Research Station, Agriculture Canada, Vancouver, British Columbia, V6T1X2; Volcani Center, Bet Dagan, Israel. Erwinia spp. cause galls on Douglas fir in coastal British Columbia. R.M. DeYoung, R.J. Copeman, A.M Muehlchen, M.S. Lapp, and D.I. Dunstan. Plant Science Department, University of British Columbia, Vancouver, British Columbia V6T2A2, and Plant Biotechnology Institute, National Research Council of Canada, Saskatoon, Saskatchewan S7N 0W9. Effects of host debris on abundance of leafspot pathogens of alfalfa. J.A. Duthie and C.L. Campbell. Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695-7616. A survey of common weeds of British Columbia for beet western yellows virus and potato leafroll virus using monoclonal antibodies. P.J. Ellis, Research Station, Agriculture Canada, 6660 N. W. Marine Dr. Vancouver, British Columbia V6TIX2. Copper deficiency in barley and wheat crops in Alberta. I.R. Evans. Crop Protection Branch, Alberta Agriculture 7000-113 Street, Edmonton, Alberta T6H 5T6. Sunn-hemp mosaic virus facilitates infection of the cowpea strain of southern bean mosaic virus in a nonpermissive host. L. Fuentes and R.I. Hamilton. Plant Science Department, University of British Columbia, Vancouver, British Columbia, V6T2A2 and Research Station, Agriculture Canada, 6660 N. W. Marine Drive, Vancouver, B. C V6T 1X2. The effects of cold storage on the mycorrhizal status of apple rootstocks. S. Gamiet and S.M. Berch. Department of Soil Science, University of British Columbia, Vancouver, British Columbia V6T2A2 Effect of cottony snow mold and freezing resistance on winter wheat survival in central and northern Alberta. D.A. Gaudet, M.K. Bhalla, and G.W. Clayton. Research Station, Agriculture Canada, Lethbridge, Alberta T1J4B1, Research Station, Agriculture Canada, Lacombe, Alberta T0C ISO, Ft. Vermilion Experimental Farm, Ft. Vermilion, Alberta TO H I NO. Biocontrol of dollarspot disease of creeping bentgrass. D.M. Goodman and L.L. Burpee. Department of Environmental Biology, University of Guelph, Guelph, Ontario N1G2W1. Disease progress of crown and root rot of alfalfa in Saskatchewan: First three years. B.D. Gossen. Research Station, Agriculture Canada, Saskatoon, Saskatchewan, S7N 0X2. Notes on snow molds on winter cereals in Saskatchewan 1985-88. B.D. Gossen. Research Station, Agriculture Canada, Saskatoon, Saskatchewan, S7N 0X2. Properties of a potexvirus isolated from Lychnis alba. R.I. Hamilton and D.A. Wakarchuk. Research Station, Agriculture Canada, 6660 NW Marine Drive, Vancouver, British Columbia V6T1X2. A comparison of the interactions between different cowpea cultivars and the monokaryotic phase of the cowpea rust fungus. Michèle C. Heath. Botany Department, University of Toronto, Toronto, Ontario M5S 1A1. A microcomputer-based information retrieval system for fungicides registered in Canada. R.J. Howard. Alberta Special Crops and Horticultural Research Center, Brooks, Alberta T0J 0J0. Comparative studies on myceliogenic germination of tan sclerotia of Sclerotinia sclerotiorum and Sclerotium rolfsii. H.C. Huang and S.K. Sun. Research Station, Agriculture Canada, Lethbridge, Alberta, and Department of Plant Pathology, National Chung-Hsing University, Taichung, Taiwan. Survival of "resistant" white pine growing in plantations in British Columbia. R.S. Hunt and M.D. Meagher. Pacific Forestry Centre, Canadian Forestry Service, 506 West Burnside Rd., Victoria, British Columbia V8Z 1M5. Effects of VA mycorrhizae on the development of verticillium and fusarium wilts of alfalfa. S.F. Hwang, Alberta Environmental Centre, Vegreville, Alberta TOB 4L0. An in vitro method for screening potential antagonists of Sclerotinia sclerotiorum. G.D. Inglis and G.J. Boland. Department of Environmental Biology, University of Guelph, Guelph, Ontario NIG 2W1. A preliminary study of conifer tissue reaction to the presence of endophytic fungi using tissue culture, light and electron microscopy techniques. John A. Johnson and Norman J. Whitney. Department of Forest Resources, University of New Brunswick, Fredericton, New Brunswick E3B6C2. Conifer needle endophytes from eastern Canada: A preliminary investigation of endophytes of balsam fir (Abies balsamea) and red spruce (Picea rubens). John A. Johnson and Norman J. Whitney. Department of Forest Resources, University of New Brunswick, Fredericton, New Brunswick E3B 6C2. Evaluation of agronomic practices to reduce the survival of sclerotia of Sclerotium cepivorum in the field. V.K. Joshi and J.E. Rahe. Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6. Cylindrocladium root rot in Ontario bareroot nurseries: estimate of losses in spruce seedlings. J. Juzwik, C. Honhart, and N. Chong. Pest Control Section, Ontario Ministry of Natural Resources, c/o Great Lakes Forestry Centre, Sault Ste. Marie, Ontario P6A 5M7. Alternative methods to forecast the time of first fungicide application against cercospora blight of carrot. A.C. Kushalappa, G. Boivin, and L. Brodeur. Macdonald College of McGill University, Ste. Anne de Bellevue, PQ H9X 1 CO; Agriculture Canada, Box 457 St. Jean sur Richelieu, PQ G3B6Z8, and IPM Program, 539 Blvd. Edward 7, St. Jacques le Mineur, Quebec GOG IZ0. Scleroderris canker on balsam fir. G. Laflamme. Laurentian Forestry Centre. Canadian Forestry Service, Sainte- Foy, Québec G1V4C7. Variation in suppression of typhula blight (gray snow mold) of turfgrass by isolates of Typhula phacorrhiza. M.B. Lawtonand L.L. Burpee. Department of Environmental Biology, University of Guelph, Guelph, Ontario NIG 2WI. A new technique for studying fungal colonization of roots. C.A. Lévesque and J.E. Rahe. Centre for Pest Management, Simon Fraser University, Burnaby, British Columbia V5A IS6. Sclerotial morphogenesis in Sclerotium cepivorum. E.R. Littley and J.E. Rahe. Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6. Virulence of Fusarium oxysporum f.sp. asparagi and Fusarium moniliforme on asparagus seedlings grown from aseptic fungicide-free seeds. F.J. Louws and L.V. Edgington. Department of Environmental Biology, University of Guelph, Guelph, Ontario NIG 2WI. Colletotrichum dematium leaf spot of English ivy. C. Lum and R.J. Copeman. Plant Science Department, University of British Columbia, Vancouver, British Columbia V6T2A2. Relationships between blueberry scorch virus and four other carlaviruses. S.G. MacDonald and R.R. Martin. Research Station, Agriculture Canada, Vancouver, British Columbia V6T 1X2. Examination of luteovirus relationships with random primed cDNA probes. R.R. Martin and C.J. D'Arcy. Research Station, Agriculture Canada, Vancouver, British Columbia V6T1X2 and University of Illinois, Urbana- Champaign, IL 61801. Detecting selection in the Rhynchosporium secalis- Hordem vulgare pathosystem. J.M. McDermott, R.W. Allard, and R.K. Webster. Department of Genetics and (R.K.W.) Department of Plant Pathology, University of California, Davis, CA 95616. Population structure of natural Rhynchosporium secalis populations based on variation in isozyme, ribosomal DNA, colony colour and pathogenicity markers. J.M. McDermott, B.A. McDonald, R.W. Allard, and R.K. Webster. Department of Genetics, University of California, Davis, CA 95616, and (B.A.M.) Department of Plant Pathology and Microbiology, Texas A & M University, College Station, TX 77843, and (R.K.W.) Department of Plant Pathology, University of California, Davis CA 95616. Development and control of cavity spot of carrot. M.R. McDonald and L.V. Edgington. University of Guelph, Guelph, Ontario N1G2WI. Separating energy demand of Meloidogyne incognita from impact on physiological efficiency of Vitis vinifera. H. Melakeberhan and H. Ferris. Department of Nematology, University of California, Davis, CA 95616. The effects of avirulent races of Erysiphe graminis f. sp. tritici (Egt) and isolates of E. graminis f. sp. hordei (Egh) upon the parasitic fitness of virulent races of Egt. J.G. Menzies and B.H. MacNeill. Research Station, Agriculture Canada, Agassiz, British Columbia V0M 1AO, and Department of Environmental Biology, University of Guelph, Guelph, Ontario NIG 2W1. Effect of leaf wetness and other factors on Phomopsis convolvulus, a potential bioherbicide for field bindweed control. Louise Morin, Alan K. Watson, and Richard D. Reeleder. Macdonald College of McGill University, Ste-Annede- Bellevue, Quebec H9X 1C0. Using thiabendazole to control seed-borne Ascochyta in lentil. R. A. A. Morrall. Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0 W0. Relationship of incidence of white mold in white bean to inoculum, canopy density, and rainfall. C. N. Mwiindilila and R. Hall. Department of Environmental Biology, University of Guelph, Guelph, Ontario NIG 2WI. Electrophoretic heterogeneity among dianthoviruses: Characterization of electrophorotypes by agarose gel electrophoresis. Hanumantha R. Pappu and C. Hiruki. Department of Plant Science, University of Alberta, Edmonton, Alberta T6G 2P5. Development of a weather-timed fungicide spray program for field tomatoes. R.E. Pitblado, Ridgetown College of Agricultural Technology, Ridgetown, Ontario NOP 2C0. Localized accumulation of mansonones E and F in elms following inoculation with Ophiostoma ulmi. R.H. Proctor and E.B. Smalley. Department of Plant Pathology, University of Wisconsin, Madison, WI53706 USA. Pathogenicity and aggressiveness of Botrytis fabae isolates on selected resistant faba bean lines. K.Y. Rashid and C.C. Bernier. Research Station, Agriculture Canada, Box 3001. Morden, Manitoba R0G l JO. and Department of Plant Science, University of Manitoba, Winnipeg, Manitoba R3T2N2. Plant diseases and the interior plantscaping industry. S.A. Raymundo. Straits Tropical Interiors, Inc., 4 Annis Road, Scarborough, Ontario Ml M 2Y7. Effect of verticillium wilt on frost resistance and yield of alfalfa. C. Richard and R. Michaud. Station de recherches, Agriculture Canada, 2560, boul. Hochelaga, Sainte- Foy, Québec G1V2J3. Sequence and organization of the melon necrotic spot virus genome. C.J. Riviere and D.M. Rochon. Plant Science Department, University of British Columbia, Vancouver, British Columbia V6T2A2, and Research Station, Agriculture Canada, Vancouver, B.C. V6T1X2. The influence of transpiration on the movement of xenobiotics in the phloem. M.L. Romano and L.V. Edgington. Department of Environmental Biology, University ofGuelph, Guelph, Ontario NIG 2W1 Detection of papaya mosaic, a potex virus and potato spindle tuber viroid by nonradioactive RNA probes. B.P. Roy, M.G. AbouHaidar, T.L. Sit, and A. Alexander. Department of Botany, University of Toronto, Toronto, Ontario M5SIAl. Ahernaria helianthi: sunflower pathogen and teaching material. W.E. Sackston and Jean-Pierre Deland. Department of Plant Science, Macdonald College of McGill University, 21111 Lakeshore Road, Ste. Anne de Bellevue, Quebec H9X 1 CO. Effect of cropping sequence on take-all and take-all decline in spring durum wheat under irrigation. R.W Stack and C. Thompson. North Dakota State University, Fargo, ND 58105, and North Dakota North Central Agric. Exp. Sta., Minot, ND 58701. Rosellinia minor on container-grown conifer seedlings in British Columbia. R.N. Sturrock and J.R. Sutherland. Pacific Forestry Centre, Canadian Forestry Service, 506 W. Burnside Road, Victoria, British Columbia V8Z 1M5. Inheritance of tan spot resistance in hexaploid, tetraploid, and diploid wheat. E.E. Sykes and C.C. Bernier. Department of Plant Science, University of Manitoba, Winnipeg, Manitoba R3T 2N2. Influence of soil moisture, seeding dates, and canola cultivars on carpogenic germination and rotting of sclerotia of Sclerotinia sclerotiorum. B.K. Teo, PR. Verma, and R.A.A. Morrall. Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, S7N0W0, and Research Station, Agriculture Canada, Saskatoon, Saskatchewan S7N 0X2. Biological control of Pythium ultimum by Pseudomonas putida and P. fluorescens strains. E.M. Tipping, R. Lifshitz, R. Zablotowicz, E. Onofriechuk and J.W. Kloepper. Allelix Agriculture, 6850 Goreway Drive, Mississauga, Ontario L4V1 PI. Isolation of a closterovirus and a tobamovirus from dwarf flowering almond. D. Thompson and R. Stace- Smith. Department of Plant Science, University of British Columbia, Vancouver. British Columbia V6T1X2, and Research Station, Agriculture Canada, 6660 N. W. Marine Drive, Vancouver, British Columbia V6T1X2. Stem rot of canola caused by Sclerotinia sclerotiorum: Fluctuations in ascospore infestation of petals. T.K. Turkington, R.A.A. Morrall and D.A. Kaminski. Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0 W0. The location of Erysiphe graminis antigens in infected barley tissue. C. Van Roestel, A.W. Day, and W.E. McKeen. Plant Sciences Department, University of Western Ontario, London, Ontario N6A 5B7. Cytological differences between compatible and incompatible interactions of soybean with Phytophthora megasperma f.sp. glycinea. E.W.B. Ward, D.M. Cahill and M.K. Bhathacharyya. Research Centre, Agriculture Canada, 1400 Western Road, London, Ontario N6G 2V4. Detection of Erwinia pectate Iyase with a monoclonal antibody. L. Ward and S.H. De Boer. Research Station, Agriculture Canada, Vancouver, British Columbia V6T1X2. Transmission of potato virus S (PVS) by aphids. Elizabeth A. Wardrop, A.B. Gray, R.P. Singh, and J.F. Peterson. Department of Biology, Nova Scotia Agricultural College, Truro, Nova Scotia B2N5E3, Research Station, Agriculture Canada, P.O. Box 20280, Fredericton, New Brunswick E3B4Z7, and Department of Plant Science, Macdonald College of McGill University, Ste. Anne de Bellevue, Quebec H9X 1C0. Development and maturation of Pyrenophora triticirepentis pseudothecia in Ontario. K.H. Wright and J.S. Sutton. Department of Environmental Biology, University of Guelph, Guelph, Ontario NIG2WL