Abstracts of papers presented at the annual meeting of the Canadian Phytopathological Society University of Saskatchewan, Saskatoon 27-30 July 1986

Abstract

Root pathogens: a major factor in limiting wheat yield in an arid zone environment. J. Amir, J. Krikun, D. Orion, and J. Putter. Agricultural Res Org. The Volcani Center, Bel Dagan 50-250, Israel. Effect of Bradysia prédation on mycoparasitism of the sclerotia of Sclerotinia sclerotiorum. Osama Anas and R.D. Reeleder. Department of Plant Science, Macdonald College of McGill University, Ste-Anne-de-Bellevue, Quebec H9X1C0. Isolation and characterization of a host-specific toxin producted by Alternaria brassicae. P.S. Bains and J.P. Tewari. Department of Plant Science, University of Alberta, Edmonton, Alberta T6G2P5. Soybean bacterial blight measurements and a relationship between disease incidence and severity. P.K. Basu and G. Butler. Plant Research Centre, Agriculture Canada, Ottawa, Ontario K1A 0C6. First report of pepper mild mottle virus (PMMV) in Canada. L. Beczner, D.M. Rochon, and R.I. Hamilton. Plant Protection Institute, Budapest, Hungary and Research Station, Agriculture Canada, Vancouver, British Columbia V6T1X2. Induction, characterization and mapping of mutations in Ophiostoma ulmi. L. Bernier and M. Hubbes. Faculty of Forestry, University of Toronto, Toronto, Ontario M5S IAl. Infection sites for Pseudomonas syringae pv. papulans on Mutsu apple fruit. W.G. Bonn and K.E. Bedford Research Station, Agriculture Canada, Harrow, Ontario NOR 1 GO. Passive antibiotic diffusion from ascospores of Chaetomium globosum as the mechanism for biocontrol of apple scab. M.A. Boudreau and J.H. Andrews. Department of Plant Pathology, University of Wisconsin, Madison, Wl53706. Effect of Phoma canker on yield of two parsnip cultivars. R.F. Cerkauskas. Vineland Research Station, Agriculture Canada, Vineland Station, Ontario LOR 2E0. Effect of Colletotrichum orbiculare on yield of two pickling cucumber cultivars. R.F. Cerkauskas and J. O'Sullivan. Vineland Research Station, Agriculture Canada, Vineland Station, Ontario LOR 2E0, and Simcoe Horticultural Experiment Station, Simcoe, Ontario N3 Y 4N5. The effect of previous crop and intensive management on yield of barley. R.V. Clark and D.A. Galway. Plant Research Centre, Agriculture Canada, Ottawa, Ontario K1A 0C6. Hypersensitive reaction induced by Alternaria brassicae in Eruca sativa, an oil-yielding crucifer. K.L. Conn and J.P. Tewari. Department of Plant Science, University of Alberta, Edmonton. Alberta T6G 2P5. ADAS vegetable research in the United Kingdom. John M.L. Davies (on behalf of the Vegetable Pathology Group). ADAS, MA FF, Government Buildings, Willington Road, Kirton, Boston, Lincolnshire PE20 1EJ, England. Induction of mRNA for phenylalanine ammonia lyase and chalcone synthase in the hypersensitive response of soybean to Phytophthora megasperma f.sp. glycinea (Pmg). R. Esnault, R.N. Chibbar, D. Lee, R.B. van Huystee, and E.W.B. Ward. Department of Plant Sciences, University of Western Ontario, London, Ontario; (R.E.) Institute de Physiologie Végétale, CNRS, Gif/ Yvette, France; (R.N.C) Plant Biotechnology Institute, NRC, Saskatoon, Saskatchewan; (E.W.B.W.) Research Centre, Agriculture Canada, London, Ontario. Disease forecasting for sclerotinia white stem rot in canola. I.R. Evans and J. Calpas. Crop Protection Branch, Alberta Agriculture, Edmonton, Alberta T6H 5T6. A field technique for demonstrating bacterial ring rot (BRR) in symptomless potato varieties. I.R. Evans and J.B. Stenrue. Crop Protection Branch, Alberta Agriculture, Edmonton, Alberta T6H 5T6. Comparative pathogenicity of nonsclerotial isolates of Coprinus psychromorbidus under controlled conditions. D.A. Gaudet. Research Station, Agriculture Canada, P.O. Box 3000, Main, Lethbridge, Alberta T1J4B1. Protection of canola seedlings from Rhizoctonia solani infection by a nonpathogenic, binucleate Rhizoctonia like isolate. R.K. Gugel. P.R. Verma, and D.A. Kaminski. Research Station, Agriculture Canada, 107 Science Crescent, Saskatoon, Saskatchewan S7N 0X2. Anastomosis grouping of Rhizoctonia isolates and importance of organisms associated with root rot of canola in the Peace River region of Alberta. R.K. Gugel, S.M. Yitbarek, P.R. Verma, R.A.A. Morrall, and R.S. Sadasivaiah. Research Station, Agriculture Canada, 107 Science Crescent, Saskatoon, Saskatchewan S7N0X2, (R.A.A.M.) Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0, (R.S.S.) Research Station, Agriculture Canada, Box 3000, Lethbridge, Alberta TU 4B1. A strain of brome mosaic virus identified as cause of mosaic disease of wheat in Manitoba. Steve Haber and R.I. Hamilton. Research Station, Agriculture Canada, 195 Dafoe Road, Winnipeg, Manitoba R3T2M9, and 6660 NW Marine Drive, Vancouver, British Columbia V6T1X2. Fungal endophytes in Festuca and Lolium. P.M. Halisky, D.C. Saha, B.O. Bayaa, and C.R. Funk. New Jersey Agricultural Experiment Station, New Brunswick, New Jersey 08903. Symptomatology and etiology of head rot of broccoli in Atlantic Canada. P.D. Hildebrand. Research Station, Agriculture Canada, Kentville, Nova Scotia B4N 1J5. Diseases of interiorscape plants in Alberta. R.J. Howard and M.D. Dykstra. Alberta Horticultural Research Center, Brooks, Alberta T0J 0J0. Effect of two herbicides on nutrient-independence and viability of Cochliobolus sativus conidia in soil. T. Isakeit and J.L. Lockwood. Department of Botany and Plant Pathology, Michigann State University, East Lansing, MI 48824-1312 Integrated control of cucumber powdery mildew in the greenhouse. W.R. Jarvis and J.W. Berry. Research Station, Agriculture Canada, Harrow, Ontario NOR 1G0. The fatty acid composition and its alterations due to different incubation temperature in the lipids of aggressive and nonaggressive strains of Ophiostoma ulmi. R.S. Jeng and M. Khan. Faculty of Forestry, University of Toronto, Toronto, Ontario M5S IAI Survival and inoculum production by Gibberella zeae in wheat and corn residues. E.B. Khonga and J.C. Sutton. Department of Environmental Biology, University of Guelph, Guelph, Ontario NIG2W1. Problems of scleroderris canker on black spruce. G. Laflamme. Laurentian Forestry Centre, Agriculture Canada, Sainte-Foy, Quebec G1V4C7. Differential response of roots of barley lines to purified and separated Cochliobolus sativus toxins. S.S. Lee and R.W. Stack. Department of Plant Pathology, North Dakota State University, Fargo 58105. Endophytic fungi in pine needles and their relation to epiphytic fungi and scleroderris canker. D. Legault, M. Dessureault, and G. Laflamme. Department of Forest Sciences, Laval University, Sainte-Foy, Quebec G1K7P4 and Laurentian Forestry Centre, Agriculture Canada, Sainte-Foy, Quebec G1V4C7. Nature and inheritance of resistance to Albugo Candida in Brassica napus. Q. Liu and S.R. Rimmer. Department of Plant Science, University of Manitoba, Winnipeg, Manitoba R3T2N2. Cross protection of tomato against fusarium crown and root rot in growth pouches and the greenhouse. J.H Louter and L.V. Edgington. Department of Environmental Biology, University of Guelph, Guelph, Ontario NIG 2W1. A field inoculation technique for inducing severe Rhizoctoni solani pre-emergence damping-off in canola. D.L. McKenzie and P.R. Verma. Agriculture Canada Research Station, Saskatoon, Saskatchewan S7N 0X2. The overwintering of Erysiphe graminis f. sp. tritici as incipient lesions on winter wheat in southern Ontario. J.G. Menzies and B.H. MacNeill. Department of Environmental Biology, University of Guelph, Guelph, Ontario N1G2WI. Early cytological responses of alfalfa to inoculation with Verticillium albo-atrurn. A.G. Newcombe and E.J. Robb. Departments of Botany and Molecular Biology and Genetics, Unversity of Guelph, Guelph, Ontario NIG 2W1. Investigations of sclerotinia stem rot (Sclerotinia sclerotiorum) on spring sown oil crops in Sweden. K Nordin. Swedish University of Agricultural Sciences, P.O. Box 7044, S-750 07 Uppsala, Sweden. The effect of alfalfa mosaic virus on germination and tube growth of alfalfa pollen. Z. Pesic and C. Hiruki. Department of Plant Science, University of Alberta, Edmonton, Alberta T6G 2P5. Consequences of survival of Leptosphaeria maculans (blackleg) in canola stubble residue through an entire crop rotation sequence. G.A. Pétrie. Research Station, Agriculture Canada, 107 Science Crescent, Saskatoon, Saskatchewan S7N 0X2. Integration of soil solarization with the hyperparasitic fungus, Coniothyrium minitans, for control of Sclerotinia minor on lettuce. l.J. Porter. Plant Research Institute, Department of Agricultural and Rural Affairs, Swan St., Burnley, 3121, Victoria, Australia. Integration of soil solarization with low rates of dazomet for disease control in Victoria. I. J. Porter. Plant Research Institute, Department of Agriculture and Rural Affairs, Swan St., Burnley, 3121, Victoria, Australia. A technique for screening wheat cultivars for resistance to Septoria tritici. D.A. Potts and G.R. Hughes. Department of Crop Science and Plant Ecology, University of Saskatchewan, Saskatoon, Saskatchewan, S7N0W0. The effects of rust on the yield and yield components in faba bean. K.Y. Rashid and C.C. Bernier. Department of Plant Science, University of Manitoba, Winnipeg, Manitoba R3T2N2. Role of oxalic acid in the pathogenicitv of Mycena citricolor. D.V. Rao and J.P. Tewari. Department of Plant Science, University of Alberta, Edmonton, Alberta T6G 2P5. Rhizosphere colonization and biological effects related to bacterization of onion seeds with Bacillus subtilis. M.S. Reddy and J.E. Rahe. Centre for Pest Management, Simon Fraser University, Burnaby, British Columbia. Factors increasing the severity of canola root rot in northern Alberta. D. W. Sippell, R.S. Sadasivaiah, and M, Cox. Research Station, Agriculture Canada, P.O. Box 29, Beaverlodge, Alberta TO H 0C0. Population dynamics of take-all and the crown root rot pathogens of winter wheat as influenced by crop sequences. A.V. Sturz and C.C. Bernier. Department Plant Science, University of Manitoba, Winnipeg, Manitoba R3T2N2. Localization of cerato-ulmin in the aggressive isolates of Ophiostoma ulmi by immunohistochemistry and scanning electron microscopy. A.M. Svircev, R.S. Jeng, and M. Hubbes. Faculty of Forestry, University of Toronto, Toronto, Ontario M5S 1A1. Light microscope observation of tissue culture of Ulmus americana and U. pumila inoculated with Ophiostoma ulmi. M.H. Szczegola, R.S. Jengand M. Hubbes. Faculty of Forestry, University of Toronto, Toronto, Ontario M5S 1A1. The influence of soil moisture, seeding dates, and Rhizoctonia isolates on disease incidence and yield in canola. B.K. Teo, S.M. Yitbarek, P.R. Verma, and R.A.A. Morrall. Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N0W0 and Research Station, Agriculture Canada, Saskatoon, Saskatchewan S7N 0X2 Predicting stem rot of canola: sample size and number in relation to measurement of petal infestation by Sclerotinia sclerotiorum. T.K. Turkington, R.A.A. Morrall, and R.K. Gugel. Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0. Effect of biological agents on apple replant disease. R.S. Utkhede and Thomas S.C. Li. Research Station, Agriculture Canada, Summerland, British Columbia V0H 1Z0. Analysis of the relationship between net blotch severity and grain yield in barley. C.G.J. van den Berg and B.G. Rossnagel. Department of Crop Science, and Crop Development Centre, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0. Decay of balsam fir in spaced stands after defoliation by insects. R.E. Wall and H. Piene. Canadian Forestry Service, P.O. Box 4000, Fredericton, New Brunswick E3B5P7. Electrophoretic soluble protein patterns of aggressive and nonaggressive strains of Ophiostoma ulmi grown at 10°, 22°, and 30°C. S. Wetzel and R.S. Jeng. Faculty of Forestry, University of Toronto, Toronto, Ontario M5S IA1. Effective control of white root rot with procymidone in long season bulb onions. J. A.-L. Wong and J.R. Maynard. Department of Agriculture, G.P.O. Box 192B, Hobart, Tasmania, Australia 7001. Effects of substrate and photoperiod on the growth and sporulation of Septoria nodorum and Pyrenophora tritici-repentis . L.S.L. Wong and G.R. Hughes. Department of Crop Science and Plant Ecology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0. Efficacy of foliar-applied fungicides against blackleg of rapeseed. K. Xi, R.A.A. Morrall, and P.R. Verma. Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N0W0 and Research Station, Agriculture Canada, Saskatoon, Saskatchewan S7N 0X2. Pathogenic variation among isolates of Septoria nodorum. Rong-Cai Yang and G.R. Hughes. Department of Crop Science and Plant Ecology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0 W0. Anastomosis grouping, virulence and specificity of Rhizoctonia solani isolates from canola and soils in Saskatchewan. S.M. Yitbarek, P.R. Verma, and R.A.A. Morrall. Research Station, Agriculture Canada, Sakatoon, Saskatchewan S7N 0X2 and Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0. Probable nature of primary infection process of downy mildew (DM) on buckwheat. R.C. Zimmer. Research Station, Agriculture Canada, P.O. Box 3001, Morden, Manitoba ROG UO.