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Effects of inoculation timing on symptom development in Ulmus americana L.Author(s): Garrett L. Beier; Benjamin W. Held; Chad P. Giblin; Robert A. Blanchette
Source: In: Pinchot, Cornelia C.; Knight, Kathleen S.; Haugen, Linda M.; Flower, Charles E.; Slavicek, James M., eds. Proceedings of the American elm restoration workshop 2016; 2016 October 25-27; Lewis Center, OH. Gen. Tech. Rep. NRS-P-174. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 30-36.
Publication Series: Paper (invited, offered, keynote)
Station: Northern Research Station
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DescriptionField inoculation trials are an important component of screening American elms (Ulmus americana) for levels of resistance to Dutch elm disease. A major concern in screening is variability in disease ratings from year to year. Previous studies have demonstrated that timing of inoculation can have a significant impact on disease susceptibility. In this study, trees were inoculated in the main stem using a drill method of inoculation. A recently collected isolate of Ophiostoma novo-ulmi with known pathogenicity was used for inoculations. Three different inoculation times were examined: early (May 26), mid (June 23), and late (August 4) season. Trees were assessed for wilt symptoms at 2, 4, 6, and 8 weeks post inoculation using a disease severity scale of 1-6. The trees in the early season inoculation group had the highest mean disease severity ratings at 4, 6, and 8 weeks post inoculation (WPI), while the late season inoculation group had the lowest disease rating at every time point as well as the smallest area under the disease progress curve. Scientists evaluating American elms for resistance to Dutch elm disease should avoid late season inoculations due to reduced disease susceptibility.
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CitationBeier, Garrett L.; Held, Benjamin W.; Giblin, Chad P.; Blanchette, Robert A. 2017. Effects of inoculation timing on symptom development in Ulmus americana L. In: Pinchot, Cornelia C.; Knight, Kathleen S.; Haugen, Linda M.; Flower, Charles E.; Slavicek, James M., eds. Proceedings of the American elm restoration workshop 2016; 2016 October 25-27; Lewis Center, OH. Gen. Tech. Rep. NRS-P-174. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 30-36.
- The ecological role of American elm (Ulmus americana L.) in floodplain forests of northeastern North America
- Use of culture filtrates of Ceratocystis ulmi as a bioassay to screen for disease tolerant Ulmus americana
- Development of new Dutch Elm disease-tolerant selections for restoration of the American Elm in urban and forested landscapes
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