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Research and IPM
Models: Disease Severity Table
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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