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Research and IPM

Models: Disease Severity Table

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Modified DSV Table: Hours of leaf wetness required for DSV accumulations 1-4
Mean temperature (C)
during leaf wetness		 Hours of leaf wetness
13-17 0-6 7-15 16-20 21+
18-20 0-3 4-8 9-15 16-22 23+
21-25 0-2 3-5 6-12 13-20 21+
26-29 0-3 4-8 9-15 16-22 23+
DSV 0 1 2 3 4

Table from Madden L., Pennypacker, S. P., and McNab, A. A. 1978. FAST, a forecast system for Alternaria solani on tomato. Phytopathology 68:1354-1358.

Disease severity values (DSV) are calculated as a function of hours of leaf wetness and average air temperature during leaf wetness. The DSV is based on the FAST early blight model of tomato. After treatment, the DSV accumulations reset to zero.

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