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Tolerance of Swallowworts (Vincetoxicum spp.) to Multiple Years of Artificial Defoliation and Clipping

Published online by Cambridge University Press:  20 January 2017

Lindsey R. Milbrath*
Affiliation:
USDA-ARS Robert W. Holley Center for Agriculture and Health, Ithaca, NY 14853
Antonio DiTommaso
Affiliation:
Soil and Crop Sciences Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
Jeromy Biazzo
Affiliation:
USDA-ARS Robert W. Holley Center for Agriculture and Health, Ithaca, NY 14853
Scott H. Morris
Affiliation:
Soil and Crop Sciences Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
*
Corresponding author's E-mail: [email protected]
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Abstract

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The European vines pale swallowwort and black swallowwort are invading various habitats in northeastern North America. It is unclear how these plants might respond to potential biological control agents, as they experience little herbivore damage in North America, or longer durations of mowing given the reported lack of efficacy of mechanical control. We evaluated the effect of six seasons of artificial defoliation (50 or 100% defoliation once or twice per season) and clipping (once, twice, or four times at 8 cm above the soil level) on the survival, growth, and reproduction of mature plants of the two species grown in a common garden field experiment. No plants died from damage after 6 yr. Black swallowwort produced more aboveground biomass, whereas pale swallowwort produced more root biomass and root crown buds, compared with its congener species. For most damage treatments, root biomass and the number of crown buds and stems increased over time, whereas aboveground biomass and viable seeds per plant generally did not change. Substantial overlap in plant size and seed production occurred among damage treatments and species. The most severe defoliation treatment did not substantially limit growth and reproduction compared with undamaged plants. While two clippings per season sometimes prevented seed production, four clippings per season was the only type of damage that consistently prevented plant growth and eliminated seed production. Pale and black swallowwort display a high tolerance to aboveground tissue loss in high-light environments without plant competition. The annual increase in plant size calls into question the potential efficacy of a defoliating insect against field populations of swallowworts, and it seems likely the only benefits of a long-term mowing regime will be to eliminate seed production.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

References

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