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Effects of temperature and duration of leaf wetness on infection of celery by Septoria apiicola, and cultivar screening for partial resistance

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.)

Identiferoai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.61198
Date January 1991
CreatorsMathieu, Danielle
PublisherMcGill University
Source SetsLibrary and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada
LanguageEnglish
Detected LanguageEnglish
TypeElectronic Thesis or Dissertation
Formatapplication/pdf
CoverageMaster of Science (Department of Plant Science.)
RightsAll items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated.
Relationalephsysno: 001275639, proquestno: AAIMM74881, Theses scanned by UMI/ProQuest.

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