Abstracts of papers presented at the annual meeting of the Canadian Phytopathological Society University of Guelph, Guelph, Ontario 12-16 August 1985

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Abstract
Structural and chemical analyses of the resting sporangium wall of Synchytrium endobioticum. Artificial induction of mutations in Ophiostoma ulmi, the causal agent of Dutch elm disease. Fine structure of a germinating spore of Peronospora hyoscyami f. sp. tabacina. Histopathological observations of fungal colonization of tomato cultivars resistant or susceptible to fusarium crown and root rot disease. Management of strawberry gray mold with fungicides applied to host residues. Effect of vesicular-arbuscular mycorrhizae on fusarium crown and root rot of tomato as influenced by phosphorus concentrations. Phoma canker of parsnip - overwintering and effects on seed germination. Antibodies to surface antigens of Phytophthora megasperma f. sp. glycinea. Extent of canker formation among Pinus spp. elicited by several isolates of Ascocalyx abietina. Relationship between seed-borne inoculum and infection of wheat crowns by Fusarium graminearum. Cytological responses of the nonhost species, Phaseolus vulgaris, to plant pathogenic fungi. The distribution of fimbriae in the fungi. Characterization of a mutant race of Cladosporium fulvum by the use of race and cultivar specific elicitors. A cytological study of host-parasite interactions between Endocronartium harknessii and hard pines. Effectiveness of BOTCAST in timing fungicide sprays for managing botrytis leaf blight of onions. Problems of latency in botrytis diseases. Analytical polyacrylamide gel electrofocusing of soluble mycelial proteins from Ophiostoma ulmi. Use of a doubly-marked isolate to monitor behaviour of races of Pseudomonas syringae pv. tomato. Induction of rhizomorph formation in Armillaria spp. by substances present in the bark. Cross protection of greenhouse tomatoes against fusarium crown and root rot. Influence of seeding rate and nitrogen top dressing on net blotch development in barley. Characteristics of iprodione-resistant Botrytis cinerea. Prediction of root rot severity in white bean. Chestnut blight and the survival of Castanea dentata in Southern Ontario. Entrance of Botrytis cinerea into its host. Asexual combination of races of Erysiphe graminh f. sp. tritici. Botrytis hazards in forest regeneration. R.K. Mittal and B.S.P. Biochemical and ultrastructural studies of sclerotial morphogenesis in snow mold fungi. Survival of iprodione-resistant Botrytis cinerea in vineyards. Response of faba bean selections with partial resistance to Aphanomyces euteiches under controlled environment. The interaction between Pseudomonas syringae pv. tomato and the lectin from tomato (Lycopersicon esculentum): a possible role in determining pathogen specificity. Breeding potato cultivars with resistance to potato wart disease — a success story. Race identification in Ascochyta fabae. Effect of onion seed bacterization on the germination of sclerotia of Sclerotium cepivorum in muck soil. Resistance to metalaxyl in phytophthora crown and root rot of African violet. Chemical seed treatments for control of onion maggot and onion smut. Rapid sample analysis with a simplified ELISA. The influence of high matric potentials on carpogenic germination of sclerotia of Sclerotinia sclerotiorum. Cyanide production and pathogenesis by the low temperature basidiomycete, Coprinus psychromorbidus. Chemical and biological control of apple crown rot. Biological control of onion white rot with Sporidesmium sclerotivorum in muck soil. Toxic effects of mansonones on Ophiostoma ulmi.

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