Temperature and Wetness-Duration Requirements for Grape Leaf and Cane Infection by Phomopsis viticola

Plant Disease
O ErincikMichael A Ellis

Abstract

In 1998 and 1999, controlled-environment studies were conducted in growth chambers to determine the temperature and wetness-duration parameters required for leaf and cane infection of grape by Phomopsis viticola. Greenhouse-grown 'Catawba' (Vitis labrusca) and 'Seyval' (French hybrid) grapes were inoculated with P. viticola and incubated at constant temperatures of 5, 10, 15, 20, 25, 30, and 35°C and at wetness durations of 5, 10, 15, and 20 h for each temperature. Data from each cultivar were analyzed by nonlinear regression analysis to determine the relationship between disease severity and temperature and wetness duration. A generalized form of the Analytis Beta model was found to provide the best fit to the data. Disease severity on leaves and canes increased with increasing wetness duration at most temperatures. Minimum and maximum temperatures for infection were around 5 and 35.5°C, respectively. Optimum temperatures for leaf and cane infection were between 16 and 20°C. In the 2000 and 2001 growing seasons, the generalized Beta model was validated in 'Catawba' and 'Seyval' vineyards by inoculating vines during natural rain events. Average temperature and hours of wetness for each event and inoculation were recorded and us...Continue Reading

References

May 1, 2000·Plant Disease·L V MaddenL L Wilson

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Citations

Oct 24, 2008·Phytopathology·R D MagareyC L Thayer
Feb 23, 2018·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Paola BarbaLance Cadle-Davidson
Nov 26, 2009·Mycologia·Daniel J AncoMichael A Ellis
Mar 24, 2021·Plant Disease·Elisa González-DomínguezVittorio Rossi

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