Invasive aquatic weeds are managed with herbicides to reduce their negative impacts on waterways in many areas, including the California Delta Region. Herbicides create a dynamic environment of living and decomposing plant matter that could affect larval mosquitoes and other invertebrates, such as their predators and competitors. Our objective was to compare the number of larval mosquitoes in water or water hyacinth, before and after an herbicide treatment. We created replicated pond mesocosms with water hyacinth, water hyacinth treated with glyphosate and an oil adjuvant, open water, and water with glyphosate plus adjuvant. We sampled for larval mosquitoes and other aquatic invertebrates. Before herbicide addition, there was a trend for more larval mosquitoes in open water tanks than in tanks with water hyacinth. Herbicide application resulted in an immediate decrease of larval mosquitoes. As decay progressed, larval mosquitoes became most abundant in mesocosms with herbicide‐treated hyacinth and very few larval mosquitoes were found in other habitat treatments. Although the numbers of predatory and competitor insects had some variation between treatments, no clear pattern emerged. This information on how invasive weed management with herbicides affects larval mosquitoes will allow control practices for larval mosquitoes and invasive weeds to be better integrated.

中文翻译：

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除草剂处理改变了水葫芦对蚊子幼虫丰度的影响。


使用除草剂管理入侵水草，以减少其对许多地区（包括加州三角洲地区）水道的负面影响。除草剂创造了一个充满活力和分解植物物质的环境，可能会影响幼虫蚊子和其他无脊椎动物，例如它们的捕食者和竞争对手。我们的目的是比较除草剂处理前后水或水葫芦中的幼虫数量。我们用水葫芦、用草甘膦和油佐剂处理的水葫芦、开放水以及用草甘膦加佐剂的水创建了复制的池塘中生态系统。我们对幼虫蚊子和其他水生无脊椎动物进行了采样。在添加除草剂之前，开放式水箱中的蚊子幼虫有比装有水葫芦的水箱中更多的趋势。除草剂的使用导致蚊子幼虫立即减少。随着腐烂的进行，蚊子幼虫在经过除草剂处理的风信子的中生态系统中变得最丰富，而在其他栖息地处理中发现的幼虫蚊子很少。尽管捕食性昆虫和竞争性昆虫的数量在处理之间存在一些差异，但没有出现明显的模式。有关使用除草剂的侵入性杂草管理如何影响幼虫蚊子的信息将使幼虫蚊子和侵入性杂草的控制实践能够更好地整合。