Isolation of Diplodia pinea from University of Kentucky campus Austrian pines.z
| Treatment | Expt. 1 | Expt. 2 | ||||
|---|---|---|---|---|---|---|
| Percent recovery of D. pinea | Percent recovery of D. pinea | |||||
| 2000y | 2001 | 2002 | 2000 | 2001 | 2002 | |
| Symptomless shoots with D. pinea | ||||||
| Debacarb | 55 a | 50 a | 70 a | 8 a | 17 a | 32 a |
| Tebuconazole | 40 a | 50 a | 88 a | 18 a | 30 a | 20 a |
| Water | 67 a | 60 a | 80 a | 23 a | 25 a | 45 ab |
| Oxycarboxin | 46 a | 100 a | 75 a | 25 a | 26 a | 55 ab |
| Diseased shoots with D. pinea | ||||||
| Tebuconazole | 75 a | 100 a | 100 a | 69 b | 87 b | 90 bc |
| Water | 79 a | 100 a | 100 a | 75 bc | 94 b | 100 c |
| Debacarb | 80 a | 100 a | 100 a | 79 bc | 100 b | 100 c |
| Oxycarboxin | 67 a | 100 a | 100 a | 88 c | 93 b | 100 c |
↵zExpt. 1, mature severely diseased Austrian pines (four to six replicates). Expt. 2, maturing Austrian pines with lower levels of disease (ten replicates). Both treated with fungicides by trunk injections. Percent shoots yielding D. pinea in culture (ten samples per tree).
↵yMeans in a column followed by the same letter are not significantly different; Waller-Duncan K-ratio t-test (K = 100, P = 0.05).