The use of Proline (Prothioconazole) to control pitch canker, Rhizoctonia foliage blight, and Fusiform rust in forest seedling nurseries and efforts to acquire registration

Tom E. Starkey; Scott A. Enebak

Treesearch

The use of Proline (Prothioconazole) to control pitch canker, Rhizoctonia foliage blight, and Fusiform rust in forest seedling nurseries and efforts to acquire registration

Informally Refereed

Authors:

Tom E. Starkey, Scott A. Enebak

Year:

2011

Type:

Proceedings

Station:

Rocky Mountain Research Station

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.

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Abstract

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.

Parent Publication

National Proceedings: Forest and Conservation Nursery Associations - 2010

Keywords

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

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.