Biodiversity and Landscape Unit, Gembloux Agro-Bio Tech, University of Liege, Gembloux, Belgium.
Environ Manage. 2012 Dec;50(6):1089-97. doi: 10.1007/s00267-012-9945-z. Epub 2012 Sep 27.
Japanese knotweed Fallopia japonica is an extremely abundant invasive plant in Belgium and surrounding countries. To date, no eradication method is available for land managers facing the invasion of this rhizomatous plant. We tested different chemical herbicides with two application methods (spraying and stem injection), as well as mechanical treatments, on knotweed clones throughout southern Belgium. The tested control methods were selected to be potentially usable by managers, e.g., using legally accepted rates for herbicides. Stem volume, height and density reduction were assessed after one or two years, depending on the control method. Labor estimations were made for each control method. No tested control method completely eradicated the clones. Stem injection with glyphosate-based herbicide (3.6 kg ha(-1) of acid equivalent glyphosate) caused the most damage, i.e., no sprouting shoots were observed the year following the injection. The following year, though, stunted shoots appeared. Among the mechanical control methods, repeated cuts combined with native tree transplanting most appreciably reduced knotweed development. The most efficient methods we tested could curb knotweed invasion, but are not likely to be effective in eradicating the species. As such, they should be included in a more integrated restoration strategy, together with prevention and public awareness campaigns.
日本虎杖（Fallopia japonica）是一种在比利时及其周边国家极为丰富的入侵植物。迄今为止，对于面临这种根茎植物入侵的土地管理者来说，还没有一种根除方法。我们在比利时南部用两种应用方法（喷雾和茎注射）以及机械处理测试了不同的化学除草剂，对虎杖克隆体进行了测试。选择的测试控制方法是管理者潜在可用的，例如，使用除草剂的法定接受剂量。根据控制方法的不同，在一年或两年后评估茎体积、高度和密度的减少情况。对每种控制方法都进行了劳动力估算。没有一种测试的控制方法能完全根除克隆体。用草甘膦基除草剂（3.6 kg ha(-1) 酸当量草甘膦）进行茎注射造成的损害最大，即注射后当年没有发现新的芽。但第二年，出现了生长不良的芽。在机械控制方法中，反复切割结合本地树木移植最能显著减少虎杖的生长。我们测试的最有效的方法可以遏制虎杖的入侵，但不太可能有效根除该物种。因此，它们应该与预防和公众意识运动一起纳入更综合的恢复策略中。
