Paulownia tomentosa
From Bugwoodwiki
Authors: Mandy Tu, Global Invasive Species Team, The Nature Conservancy
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Identifiers
Latin Name: Paulownia tomentosa (Thunb.) Sieb. & Zucc. ex Steud.
Common Names: Princess tree, empress tree, royal paulownia
Management/Monitoring
Paulownia tomentosa can be controlled most effectively using an integrated management approach. Cutting or girdling trees with power or manual saws are effective at preventing seed production, but repeated cutting or a herbicide treatment is necessary following cutting since Paulownia readily resprouts.
Hand pulling
Young seedlings of Paulownia can be successfully controlled by manual removal. Pulling is easiest following a rain event, as the soil becomes loose. It is important to remove all root fragments as Paulownia can resprout from root fragments.
Cutting and Girdling
Cutting of Paulownia trees is most effective at the onset of flowering. Cutting at ground-level can prevent seed production for that year, but cutting alone must be repeated for several years to successfully kill the tree. Girdling results in top-kill of that stem, but may also induce increased resprouts. Cutting and girdling followed immediately by a herbicide application (cut-stump, hack-andsquirt) has good rates of efficacy.
Chemical Control
Paulownia can successfully be controlled by herbicides. The most common herbicides used to control Paulownia include glyphosate (tradenames RoundUp®, Rodeo®) and triclopyr (Garlon 3A® or Garlon 4®).
Foliar Spray
Paulownia seedlings can be controlled by using a foliar spray of either glyphosate (2% solution with 0.5% nonionic surfactant) or triclopyr (2% solution with 0.5% nonionic surfactant). These spray herbicides should be applied directly to the leaves and sprayed-to-wet.
Cut-Stump
Following cutting of the trees at ground-level, glyphosate (25% solution) or triclopyr (50% solution) should be directly applied to the stump. The cut-stump method can be used at all times of the year, as long as the ground is not frozen.
Girdling or Hack-and-Squirt
Immediately following girdling (approximately 15 cm above the ground and the cut should be well into or below the cambium layer) or hacking, directly apply glyphosate (25% solution) or triclopyr (50% solution) into the cut area.
Basal Bark
Apply a mixture of 25% triclopyr and 75% horticultural oil to the basal parts of the tree to a height of 30-38 cm (12-15 in) from the ground. Thorough wetting is necessary for good control, and spray until run-off is noticeable at the ground line. Basal bark applications should not be applied when the ground is frozen.
Information sources
Bibliography
Johnson, K. 1996. Invasive Plants: Weeds of the Global Garden: Paulownia tomentosa. Brooklyn Botanic Garden, Brooklyn.
Remaley, T. 1998. Plant Conservation Alliance Fact Sheet: Princess Tree. http://www.nps.gov/plants/alien/fact.htm. Accessed November 25, 2002.
SE-EPPC. 2001. Weed Fact Sheets: Princess Tree. Southeast Exotic Pest Plant Council. http://www.se-eppc.org/doc.cfm?id=506. Accessed November 25, 2002.
Source Document
Weed Notes: Paulownia tomentosa; Mandy Tu, 2002.
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