Five most problem prone trees and shrubs of the 30 most common ones encountered in 6 Maryland communities in 1982.
| % of plants with problems | |
|---|---|
| Tree | |
| Peach | 110 |
| Crabapple | 78 |
| Apple (fruit) | 67 |
| Flowering cherry | 31 |
| Dogwood | 26 |
| Shrub | |
| Pyracantha | 67 |
| Lilac | 60 |
| Boxwood | 43 |
| Rose | 37 |
| Euonymous | 36 |