The five most Important disease pests by region in 1986, with rank.
| Northeast | Weighted Valuea |
|---|---|
| 1 (1)bDED | 135 |
| 2 (4) Maple decline | 45 |
| 3 (3) Anthracnose | 21 |
| 4 (-) Ash dieback | 18 |
| 5 (-) Oak wilt | 16 |
| Total of above Weighted value of all diseases | 235 |
| in region | 286 |
| Percent of all diseases | 13.1% |
| Percent of all pests | 3.3% |
| North Central | |
| 1 (1)DED | 416 |
| 2 (3) Anthracnose | 134 |
| 3 (2) Oak wilt | 98 |
| 4 (4) Maple decline | 90 |
| 5 (5) Verticillium | 82 |
| Total of above Weighted value of all diseases | 820 |
| in region | 1031 |
| Percent of all diseases | 47.2% |
| Percent of all pests | 11.9% |
| South | |
| 1 (1) DED | 102 |
| 2 (-) Lethal yellowing | 30 |
| 3 (-) Powdery Mildew | 22 |
| 4 (-) Ganoderma | 21 |
| 5 (-) Oak decline | 20 |
| Total of above Weighted value of all diseases | 195 |
| in region | 330 |
| Percent of all diseases | 15.1% |
| Percent of all pests | 3.8% |
| West | |
| 1 (1) Anthracnose | 137 |
| 2 (2) DED | 120 |
| 3 (-) Drought | 42 |
| 4 (-) Verticillium | 41 |
| 5 (3) Fire blight | 37 |
| Total of above Weighted value of all diseases | 377 |
| in region | 539 |
| Percent of all diseases | 24.7% |
| Percent of all pests | 6.2% |
| National | |
| 1 (1) DED | 773 |
| 2 (2) Anthracnose | 299 |
| 3 (3) Verticillium | 140 |
| 4 (6) Maple decline | 135 |
| 5 (4) Oak wilt | 133 |
| Total of above Weighted value of all diseases | 1480 |
| nationally | 2186 |
| Percent of all pests | 25.2% |