Abstract
BackgroundAmbrosia trifida is a highly invasive annual plant, but effective control methods have not been proposed. Among various eradication methods, cutting is a simple measure to control invasive plants, and sowing seeds of native plants may effectively increase biotic resistance to invasion. In this study, we conducted a field experiment with two treatments: cutting and sowing seeds of six native or naturalized plants.ResultsWe found a significantly lower A. trifida abundance after cutting than in the control (77% decrease). Sowing seeds of native species did not provide any additional benefit for the control of A. trifida, but increased the importance values and diversity of other native vegetation. The abundance of A. trifida was negatively correlated with that of other plant taxa based on plant cover, biomass, and density. However, biotic resistance of sown plants was not effective to control invasion because A. trifida was so competitive.ConclusionsWe concluded that cutting is an effective measure to control Ambrosia trifida while sowing seeds of native plants can increase native plant diversity.
Highlights
Ambrosia trifida, commonly called giant ragweed, is a troublesome weed species worldwide, which is native to North America (Bassett and Crompton 1982)
We evaluated the effect of the seed density of native species on biotic resistance to invasion by A. trifida in addition to conventional control measures, such as cutting
A. trifida biomass was significantly lower in the cutting and seed density treatments than in control, but no differences among seed density treatments were detected (Fig. 2)
Summary
Commonly called giant ragweed, is a troublesome weed species worldwide, which is native to North America (Bassett and Crompton 1982). It is a noxious weed for crop plants (Baysinger and Sims 1991; Harrison et al 2001; Brandes and Nitzsche 2006) and is listed as one of the most ecologically destructive weeds (Kong et al 2007). It is harmful to humans, as it produces pollen with the potential to cause allergic reactions (Gadermaier et al 2004) It is considered as a very noxious invasive plant in South Korea. We conducted a field experiment with two treatments: cutting and sowing seeds of six native or naturalized plants
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