Purple nutsedge is a troublesome weed in tomato grown in plasticulture systems. Field trials were conducted in the fall of 2017 and spring of 2018 at Balm, FL, to evaluate multiple herbicide programs applied pretransplanting (pre-T), post-transplanting (post-T), and pre-T followed by (fb) post-T for purple nutsedge control in plasticulture tomato. Pre-T treatment of sulfentrazone or S-metolachlor alone were ineffective and did not decrease purple nutsedge density compared with the nontreated control. Post-T application of halosulfuron did not reduce purple nutsedge density at 12 wk after initial treatment (WAIT) in fall 2017 but reduced the purple nutsedge density at 17 WAIT in both seasons. Pre-T sulfentrazone or S-metolachlor application fb halosulfuron applied post-T were the most effective treatments and consistently reduced purple nutsedge population in both seasons. Herbicide treatments did not injure or reduce tomato height or yield. Overall, these results suggest sequential herbicide programs, including pre-T application of sulfentrazone or S-metolachlor fb post-T application of halosulfuron generally resulted in greater purple nutsedge control compared with pre-T or post-T application only. Halosulfuron applied post-T is critical to provide season-long purple nutsedge control in plasticulture tomato.

中文翻译：

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PRE 除草剂和 POST 卤磺隆用于在可塑系统中种植的番茄中控制紫色坚果边缘

紫罗兰是一种在塑料养殖系统中种植的番茄中的一种麻烦杂草。田间试验于 2017 年秋季和 2018 年春季在佛罗里达州 Balm 进行，以评估移植前 (pre-T)、移植后 (post-T) 和 pre-T 后 (fb) 后应用的多种除草剂方案-T 用于可塑番茄中的紫色坚果边缘控制。磺胺嘧啶的预处理或小号与未经处理的对照相比，单独的异丙甲草胺无效，并且没有降低紫罗兰色密度。2017 年秋季初始处理 (WAIT) 后 12 周时，T 后施用卤磺隆并未降低紫罗兰色密度，但在两个季节均降低了 17 周时的紫罗兰色密度。Pre-T 磺胺嘧啶或小号- 异丙甲草胺施用 fb 卤磺隆在 T 后施用是最有效的处理方法，并且在两个季节都持续减少紫罗兰的数量。除草剂处理不会伤害或降低番茄的高度或产量。总体而言，这些结果表明了连续的除草剂方案，包括在 T 前施用磺草胺或小号- 异丙甲草胺 fb 与仅在 T 前或 T 后施用相比，卤磺隆在 T 后施用通常会导致对紫罗兰色的控制效果更好。在 T 后施用的卤磺隆对于在塑料栽培番茄中提供长达一个季节的紫核桃控制至关重要。