Distribution of the Infection Time of Ascospores of .

Clicks: 345
ID: 70305
2019
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Abstract
In many areas where spring is wet, fungicides are applied in relation to rain events that trigger ejection of ascospores of , which cause primary infections of apple scab. Past studies established the rate of ejection during rain in relation to light and temperature, and determined the wetting time required for infection. Simulation software uses this information to calculate risk and help time sprays accordingly. However, the distribution of the infection time required by a population of spores landed on leaves was never studied, and assumptions were used. To estimate this, we inoculated ascospores of on potted trees at different temperatures for specific wetting times. Lesions were enumerated after incubation. Lesions increased with wetness time and leveled off once the slowest spores infected the host, closely matching the monomolecular model. Wetness hours were best adjusted for temperature using the Yin equation. The minimum infection time on the youngest leaves was about 5 h, matching results from previous studies, whereas half the lesions appeared after 7 h of infection. Infection times for leaves with ontogenic resistance were longer. Our results improve current software estimates and may improve spraying decisions.
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philion2019distributionplant Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Philion, Vincent;Joubert, Valentin;Trapman, Marc;Hjelkrem, Anne-Grete R;Stensvand, Arne;
Journal Plant disease
Year 2019
DOI
10.1094/PDIS-11-18-2046-RE
URL
Keywords
Epidemiology fungi fruit disease warning systems tree fruits

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