Weed management is an important issue for nursery crop and Christmas tree producers, as well as for those maintaining turfgrass or ornamental species in landscape plantings. PRE and POST herbicides are important weed management tools for these industries. Reports of herbicide-resistant weeds increased from fewer than 100 cases in 1985 to nearly 500 cases globally in 2019, including ones found in turfgrass or ornamental systems. The evolution, persistence, and management of herbicide-resistant weeds are an ongoing educational process. We must keep our stakeholders aware of improved weed control technology and provide them information on resistant weeds. A symposium at the 2019 Weed Science Society of America meeting was conducted with presentations and discussions by invited speakers in relation to current research and potential management strategies for resistant weeds in turfgrass, landscape ornamental, and nursery crops. To prepare for the symposium, a survey was prepared for nursery producers and landscapers on the issues of herbicide-resistant weeds and offsite movement of herbicides used to control herbicide-resistant weeds. Overall, most respondents felt herbicide-resistant weeds are a serious problem and most had personally observed herbicide resistance on properties they maintain. Resistance to glyphosate was the herbicide cited by most respondents, followed by resistance to triazine herbicides. Most felt their weed-control costs had increased because of resistant weeds. Approximately 20% of respondents had their operation affected by drift of herbicides from nearby farm fields, with most reporting no damage from spray or vapor drift, but a few reported greater than 50% of the crop damaged.

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苗圃作物生产和景观维护行业的除草剂抗性

杂草管理是苗圃作物和圣诞树生产者以及在景观种植中维护草坪或观赏物种的重要问题。PRE 和 POST 除草剂是这些行业的重要杂草管理工具。抗除草剂杂草的报告从 1985 年的不到 100 例增加到 2019 年全球的近 500 例，包括在草坪草或观赏系统中发现的杂草。抗除草剂杂草的进化、持久性和管理是一个持续的教育过程。我们必须让我们的利益相关者了解改进的杂草控制技术，并向他们提供有关抗性杂草的信息。在 2019 年美国杂草科学学会会议上举行了一次专题讨论会，受邀演讲者就草坪草、景观观赏植物和苗圃作物中抗性杂草的当前研究和潜在管理策略进行了介绍和讨论。为筹备研讨会，我们为苗圃生产者和园艺师准备了一项关于抗除草剂杂草和用于控制抗除草剂杂草的除草剂异地移动问题的调查。总体而言，大多数受访者认为抗除草剂杂草是一个严重的问题，并且大多数人亲自观察到它们保持的特性对除草剂的抗性。大多数受访者提到的除草剂是对草甘膦的抗性，其次是对三嗪类除草剂的抗性。大多数人认为，由于杂草有抗药性，他们的杂草控制成本增加了。