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> MSU Potato Lab
Index of Disease Rate Infection (%)
for Visual Field Inspection
| Rate (%) |
Diseased Plants /
Plants Counted |
Diseased Plants per Acre |
| 1.0 |
100.0/10,000 |
180 |
| 0.5 |
50.0/10,000 |
90 |
| 0.25 |
25.0/10,000 |
45 |
| 0.125 |
12.5/10,000 |
22.5 |
| 0.05 |
5.0/10,000 |
9 |
| 0.01 |
1.0/10,000 |
1.8 |
| 0.005 |
0.5/10,000 |
0.9 |
| 0.001 |
0.1/10,000 |
0.18 |
The number of plants per acre is 18,000. The number of diseased plants/acre is calculated by "Rate times 180".
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