Number of surveyed declining and nondeclining ash trees that tested positive or negative for the ash yellows phytoplasma.
| Site | Declining | Healthy | ||
|---|---|---|---|---|
| AshY-negative | AshY-positive | AshY-negative | AshY-positive | |
| Ames | 17 | 0 | 15 | 0 |
| Burlington | 13 | 0 | 8 | 0 |
| Council Bluffs | 16 | 1 | 15 | 0 |
| Des Moines | 14 | 0 | 11 | 0 |
| Dubuque | 16 | 1 | 6 | 0 |
| Fort Dodge | 19 | 2 | 14 | 0 |
| Iowa City | 7 | 0 | 6 | 0 |
| Mason City | 18 | 3 | 12 | 0 |
| Sioux City | 14 | 3 | 8 | 1 |
| Total | 134 | 10 | 95 | 1 |