Influence of irrigation and plant canopy architecture on white mould disease of dry bean

White mould caused by the fungus Sclerotinia sclerotiorum (Lib.) de Bary is a major constraint to irrigated dry bean production in southern Alberta. Irrigation, coupled with dry bean canopy architecture, may influence white mould by creating conducive environmental conditions. Field experiments were...

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Bibliographic Details
Published in:Canadian journal of plant science 2018-12, Vol.98 (6), p.1280-1292
Main Authors: Kader, Kazi A, Balasubramanian, Parthiba M, Chatterton, Syama
Format: Article
Language:English
Subjects:
architecture du feuillage
Cell culture
Cultivars
dry bean
Environmental conditions
Fungi
Genotypes
haricot
Herbivores
Irrigation
Leaves
microclimat
microclimate
moisissure blanche
plant architecture
Plant sciences
Porosity
Sclerotinia sclerotiorum
Soil moisture
Soil temperature
White mold
white mould
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Summary:White mould caused by the fungus Sclerotinia sclerotiorum (Lib.) de Bary is a major constraint to irrigated dry bean production in southern Alberta. Irrigation, coupled with dry bean canopy architecture, may influence white mould by creating conducive environmental conditions. Field experiments were conducted from 2015 to 2017 at Lethbridge to determine the effect of three irrigation levels and five dry bean genotypes with different canopy architectures on white mould. Sensors and data loggers were established to monitor micro-climate data including soil moisture within the top 5 cm, leaf wetness, and soil temperature under the canopy. Canopy porosity, lodging, flower infection, and white mould disease severity were also measured. Higher moisture within the top 5 cm of the soil, lower soil temperature, elevated leaf wetness, and higher white mould incidence were observed in high irrigation plots compared with medium and low irrigation plots. Cultivars varied for leaf wetness, porosity, and lodging. Although a significant interaction between irrigation and cultivar was detected, irrigation levels did not affect disease severity significantly. Lower disease severity and incidence were recorded in AAC Burdett and Island. These cultivars have an upright growth habit, high canopy porosity, and lodging resistance, and therefore, exhibited partial field resistance (avoidance) to white mould. Mean yield across all cultivars was not affected by irrigation; however, the highest yield occurred in the medium irrigation plots. A reduced level of irrigation and development of cultivars with both avoidance and partial physiological resistance may reduce white mould severity and incidence in dry bean fields in Alberta.
ISSN:0008-4220
1918-1833
DOI:10.1139/cjps-2018-0095