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ARS Home » Midwest Area » East Lansing, Michigan » Sugarbeet and Bean Research » Research » Publications at this Location » Publication #316251

Title: Examining temperature stress for Cercospora beticola of sugar beet

Author
item JIANG, QIANWEI - Michigan State University
item KIRK, W - Michigan State University
item Hanson, Linda

Submitted to: Annual Beet Sugar Development Foundation Research Report
Publication Type: Research Notes
Publication Acceptance Date: 4/15/2015
Publication Date: 6/1/2015
Citation: Jiang, Q., Kirk, W.W., Hanson, L.E. 2015. Examining temperature stress for Cercospora beticola of sugar beet. [CD-ROM] 2014 Annual Beet Sugar Development Foundation Research Report. Denver, Colorado: Beet Sugar Development Foundation.

Interpretive Summary:

Technical Abstract: Development of Cercospora leaf spot and the causal agent, Cercospora beticola, is well known to be affected by environmental conditions. A lot of work has been done on the optimal temperatures for fungal growth and development as well as the impacts of temperatures and humidity levels below the optimum on disease development. However there has been little investigation on the impact of temperatures above the optimum range on either the fungus or disease. Previous research demonstrated that long term exposure to temperatures above the optimum for C. beticola growth could impact fungal growth and development and reduce the rate of disease development. Most of these studies included exposure periods longer than typically occur in northern growing regions. The aim of this work is to examine the impacts of short term (8 hour or less) exposure to temperatures above the optimum range for growth on C. beticola to develop improved information to use in disease management recommendations. A significant interaction was found between the temperature and the duration of exposure to the temperature for all isolates of C. beticola tested. Growth was significantly reduced at temperatures of 34°C or higher with a stronger effect with longer exposure. Some variability in sensitivity to temperature was observed between isolates. As well as reduced fungal growth, reduced sporulation was observed with 8 hour exposure to temperatures within 10°C of the optimal range for growth.