Temperature index is a proportional representation of the latent period. Temperatures at or above the optimum temperature for the disease cycle will yield 1 and the lower the temperature the infinitely longer the latent period.
Value
numeric, proportion representing the speed of the latent period in relation to the temperature optimum
Details
For equations and original documentation, see Wolf and Verreet (2005) and Wolf et al. (2001)
References
Wolf, P. F. J., and J. A. Verreet. “Factors Affecting the Onset of Cercospora Leaf Spot Epidemics in Sugar Beet and Establishment of Disease-Monitoring Thresholds.” Phytopathology® 95, no. 3 (March 2005): 269–74. https://doi.org/10.1094/PHYTO-95-0269.
Wolf, P. F. J., F.-J. Weis, and J.-A. Verreet. “Threshold Values as Indicators of Fungicide Treatments for the Control of Leaf Blotching Caused by Cercospora Beticola (Sacc.) in Sugar Beets.” Journal of Plant Diseases and Protection 108, no. 3 (2001): 244–57.