A dose-response trial was conducted in two experimental runs at the Purdue University Horticulture Greenhouses, West Lafayette, IN, in 2021/2022 to determine the effect of mesotrione rate on simulated dormant 'Redefined Murray Mitcham' peppermint. Peppermint was established in 20-cm-diam polyethylene pots, it was then harvested, and pots were placed in a cooler (4 C) for 1 mo. Potted peppermint plants were removed from cold storage and treated with one of five mesotrione rates: 0 (nontreated control), 53, 105, 210, or 420 g ai ha(-1). As mesotrione rate increased from 53 to 420 g ai ha(-1), predicted peppermint injury increased from 35 to 80 at 2 wk after treatment (WAT), 36 to 95 at 4 WAT, 9 to 82 at 6 WAT, and 8 to 90 at 8 WAT; and peppermint height decreased from 74 to 42 of the nontreated control (7 cm) 2 WAT, 74 to 17 of the nontreated control (20 cm) 4 WAT, 81 to 15 of the nontreated control (28 cm) 6 WAT, and 88 to 19 of the nontreated control (37 cm) 8 WAT. Mesotrione rates from 53 to 420 g ai ha(-1) reduced peppermint dry weight from 40 to 99, respectively. Results from this experiment showed that mesotrione applied even at half of the recommended field use rate for corn (53 g ai ha(-1)) was not safe for peppermint due to a reduction in aboveground biomass.
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机译：2021/2022 年在印第安纳州西拉斐特的普渡大学园艺温室进行了两次实验，以确定甲基磺草酮率对模拟休眠“重新定义的 Murray Mitcham”薄荷的影响。将薄荷放在直径为20厘米的聚乙烯花盆中，然后收获，并将花盆放入冷却器（4°C）中1个月。将盆栽薄荷植物从冷库中取出，并用五种甲基磺草酮速率之一处理：0（未处理对照）、53、105、210 或 420 g ai ha（-1）。随着甲基磺草酮发生率从53 g ai ha（-1）增加到420 g ai ha（-1），预测薄荷损伤在治疗后2周（WAT）从35%增加到80%，在4 WAT时从36%增加到95%，在6 WAT时从9%增加到82%，在8 WAT时从8%增加到90%;薄荷高度从未处理对照（7 cm）2 WAT的74%下降到42%，未处理对照（20 cm）4 WAT的74%下降到17%，未处理对照（28 cm）6 WAT的81%下降到15%，未处理对照（37 cm）8 WAT的88%下降到19%。甲基磺草酮的用量从53到420 g ai ha（-1）分别将薄荷干重从40%降低到99%。该实验的结果表明，由于地上生物量减少，即使以玉米推荐田间利用率（53 g ai ha（-1））的一半施用甲基磺草酮对薄荷也不安全。
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