Results of bioassay testing for fungicide retention (indicated by inhibition of Raffaelea spp. growth) in redbay stem plugs and branch discs plated on spore-seeded, cycloheximide streptomycin malt agar (CSMA).
| Sample | Tree injection treatment | Months since fungicide injection | No. of trees | No. of trees with samples exhibiting inhibition | Percentage of samples per tree exhibiting inhibitionz | Percentage of samples per tree exhibiting inhibition zone in the agarz | ||
|---|---|---|---|---|---|---|---|---|
| Mean | Range | Mean | Range | |||||
| Stem plugs | Propiconazole | 7.5 | 12 | 11 | 84 a | 25–100 | 27 a | 0–75 |
| Propiconazole | 4.5 | 5 | 5 | 95 a | 75–100 | 80 b | 50–100 | |
| None | N/A | 5 | 0 | N/A | N/A | N/A | N/A | |
| Branch discs | Propiconazole | 7.5 | 12 | 5 | 33 a | 17–83 | 0 | 0 |
| Propiconazole | 4.5 | 5 | 4 | 29 a | 17–50 | 0 | 0 | |
| None | N/A | 5 | 0 | N/A | N/A | N/A | N/A | |
↵zMean and range are based only on data from trees in which inhibition of mycelial growth was exhibited. Within columns, means followed by the same letter are not significantly different (P > 0.05) as determined by a two-sample t-test. Four stem plugs and six branch samples were collected per tree.
N/A = not applicable.