The number of lesions increased with increasing temperatures over the range of wet periods except at 30$ sp circ$C, where their number decreased with increasing wetness duration. Cultivars were evaluated for partial resistance under field and greenhouse conditions. In the field ranking was based on cluster analysis of the standard area under the disease progress curve (SAUDPC) for intervals between sampling dates. In the greenhouse, the cultivars were evaluated on the basis of their response relative to five components of partial resistance: the SAUDPC, mean lesion area (MLA), pycnidial density (PCD), spore density (SPD), and the latency period defined as the time from inoculation to 50% and 75% disease (T$ sb{50}$ and T$ sb{75}$). In the greenhouse, overall ranking was based on cluster and principal component analysis of responses to SAUDPC, MLA, PCD and SPD. T$ sb{50}$ and T$ sb{75}$ were not significant. Three cultivars, Golden Plume, Superdora and Summit, were rated as moderately resistant in both field and greenhouse trials. The others ranged from moderately susceptible to very susceptible. (Abstract shortened by UMI.)
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.61198 |
| Date | January 1991 |
| Creators | Mathieu, Danielle |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Plant Science.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001275639, proquestno: AAIMM74881, Theses scanned by UMI/ProQuest. |
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