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    Author(s): Tom E. Starkey; Scott A. Enebak
    Date: 2011
    Source: In: Riley, L. E.; Haase, D. L.; Pinto, J. R., tech. coords. National Proceedings: Forest and Conservation Nursery Associations - 2010. Proc. RMRS-P-65. Fort Collins, CO: USDA Forest Service, Rocky Mountain Research Station. p. 49-57.
    Publication Series: Proceedings (P)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (371.73 KB)

    Description

    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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    Citation

    Starkey, Tom E.; Enebak, Scott A.. 2011. The use of Proline (Prothioconazole) to control pitch canker, Rhizoctonia foliage blight, and Fusiform rust in forest seedling nurseries and efforts to acquire registration. In: Riley, L. E.; Haase, D. L.; Pinto, J. R., tech. coords. National Proceedings: Forest and Conservation Nursery Associations - 2010. Proc. RMRS-P-65. Fort Collins, CO: USDA Forest Service, Rocky Mountain Research Station. p. 49-57.

    Keywords

    loblolly pine, longleaf pine, slash pine, shortleaf pine, chemical control, fusiform rust, pitch canker, Rhizoctonia foliar blight

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