The Use of Proline® (Prothioconazole) to Control Pitch Canker, Rhizoctonia Foliage Blight, and Fusiform Rust in Forest Seedling Nurseries and Efforts to Acquire Registration
Starkey, T. E. and Enebak, S. A. IN: National Proceedings: Forest and Conservation Nursery Associations — 2010, p. 49-57. Riley, L.E., Haase, D.L. and Pinto, J.R. technical coordinators. USDA Forest Service, Rocky Mountain Research Station, Proceedings RMRS-P-65. 2011.
Laboratory, greenhouse, and field trials have shown Proline® to be efficacious against three fungal pathogens that cause damage and seedling mortality in forest seedling nurseries. Disease control using Proline® has been obtained at 365 ml/ha (5 fl oz/ac) for the control of fusiform rust (Cronartium quercuum f.sp. fusiforme) on loblolly pine (Pinus taeda) in both greenhouse and field trials. In greenhouse trials, a biweekly application at 365 ml/ha (5 fl oz/ac) controlled pitch canker (Fusarium circinatum) on longleaf pine (P. palustris) and shortleaf pine (P. echinata), and resulted in a significant increase in seedling production over non-treated seedlings. In vitro studies using Proline®-amended agar resulted in 100% fungicidal control against Fusarium circinatum at all 5 rates used: 0.0625x, 0.125x, 0.25x, 0.5x, and 1x the recommended label rate. A biweekly application of Proline® at 402 ml/ha (5.5 fl oz/ac) in nursery field tests significantly reduced Rhizoctonia foliar blight on loblolly pine when compared to applications of azoxystrobin and the non-treated control. The monetary loss per hectare due to Rhizoctonia foliage blight was US$ 1735, 373, and 0 for non-treated, azoxystrobin, and Proline®, respectively. A second trial was conducted applying Proline® every 3 weeks. The monetary loss per acre was US$ 2142, 1235, and 1 for non-treated, azoxystrobin, and Proline®, respectively. In addition to disease control, Proline®-treated seedlings were significantly larger and appeared greener than non-treated seedlings. Proline® did not affect longleaf, loblolly, slash (P. elliottii), or shortleaf pine seed germination.
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Author(s): Scott A. Enebak, Tom E. Starkey
Publication: National Nursery Proceedings - 2010
Event:
Joint Meeting of the Southern Forest Nursery Association and Northeastern Forest and Conservation Nursery Association
2010 - Little Rock, Arkansas
