Sprout regrowth in 1979 for American sycamore and shamel ash injected with dikegulac and maleic hydrazide in 1977, and located in Philadelphia, PA and Hayward, CA, respectively.
| Treatment concn (g/liter) | Regrowth per limba | Flb | ||
|---|---|---|---|---|
| No. of sprouts | Mean sprout length (cm) | Longest sprout (cm) | ||
| American sycamore; Philadelphia, PA | ||||
| Control | 4.6 | 161.7 | 215.5 | — |
| Dikegulac — | ||||
| 3.0 | 3.3 | 172.5 | 204.7 | — |
| 9.0 | 4.4 | 128.0 | 166.9 | — |
| 15.0 | 4.0 | 139.5 | 178.0 | — |
| Maleic hydrazide | ||||
| 13.3 | 3.7 | 126.3 | 175.9 | — |
| 22.5 | 4.5 | 148.0 | 195.8 | — |
| 67.5 | 4.2 | 130.2 | 177.9 | — |
| LSD 5% | 1.6 | 52.2 | 62.4 | — |
| Shamel ash; Hayward, CA | ||||
| Control | 1.9 | 134.5 | 187.7 | 0.3 |
| Dikegulac — | ||||
| 9.0 | 3.1 | 151.0 | 214.3 | 0.0 |
| 15.0 | 3.0 | 127.2 | 169.5 | 0.2 |
| 45.0 | 2.0 | 94.3 | 118.2 | 0.3 |
| Maleic hydrazide | ||||
| 22.5 | 2.2 | 188.4 | 246.0 | 0.0 |
| 67.5 | 0.7* | 108.7 | 113.3 | 0.2 |
| 112.5 | 2.4 | 143.0 | 204.7 | 0.1 |
| LSD 5% | 1.1 | 81.3 | 107.8 | |
↵a Mean no. of sprouts per limb per tree and mean length of the longest sprout per limb.
↵b FI is a subjective foliar index rating (observed prior to fall coloration) on a 0 to 5 scale with 0 designating normal foliage and 5 designating dead foliage on the entire tree.
↵* Treatment mean significantly different from the control, 5% level.