Suppression of Field Paspalum in Kentucky Bluegrass with Mesotrione

Z. J. Reicher, A. J. Patton, D. V. Weisenberger
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引用次数: 1

Abstract

Field paspalum (Paspalum laeve Michx.) is a problematic, perennial weed in lawns, athletic turf, and golf courses from Texas to New Jersey with similar biology to dallisgrass (Paspalum dilatatum Poir.). The loss of monosodium methanearsonate (MSMA) from the market requires an alternative for field paspalum control in cool-season turf. We evaluated various spring application timings, frequencies, and rates of MSMA or mesotrione applied at two-week intervals in south central Indiana over three years. MSMA applied twice at 2.0 + 2.0 lb/acre (2.25 + 2.25 kg/ha) consistently provided the lowest cover of field paspalum, whereas MSMA applied once at 2.0 lb/acre, mesotrione applied twice at 0.25 + 25 lb/acre (0.28 + 0.28 kg/ha), or mesotrione applied three times at 0.167 + 0.167 + 0.167 lb/acre (0.187 + 0.187 + 0.187 kg/ha) provided equivalent and slightly higher coverage of field paspalum than MSMA applied twice at 2.0 + 2.0 lb/acre. Applications initiated in mid to late May reduced field paspalum coverage more than earlier applications. Though mesotrione only partially reduced coverage of field paspalum with the rates and timings in our study, it has excellent turf safety on cool-season grasses and may be a suitable replacement for MSMA. However, increased efficacy is needed before mesotrione becomes commercially viable for field paspalum control.

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美舒酮对肯塔基蓝草田间雀稗的抑制作用
野雀稗(paspalum laeve Michx.)是一种问题丛生的多年生杂草,生长在从德克萨斯州到新泽西州的草坪、运动草皮和高尔夫球场上,其生物学特性与达拉斯草(paspalum dilatatum Poir.)相似。甲醇磺酸钠(MSMA)从市场上流失,需要一种替代方案来控制冷季草坪上的野雀稗。我们评估了三年来在印第安纳州中南部每隔两周使用MSMA或mesotrione的各种春季应用时间、频率和速率。MSMA以2.0 + 2.0磅/英亩(2.25 + 2.25千克/公顷)施用两次,始终提供最低的大田雀稗覆盖率,而MSMA以2.0磅/英亩施用一次,mesotrione以0.25 + 25磅/英亩(0.28 + 0.28千克/公顷)施用两次,或mesotrione以0.167 + 0.167 + 0.167磅/英亩(0.187 + 0.187 + 0.187千克/公顷)施用三次,与MSMA以2.0 + 2.0磅/英亩施用两次相比,其提供的大田雀稗覆盖率略高。五月中下旬开始的申请比早期的申请更减少了雀稗的覆盖范围。虽然在我们的研究中,美索三酮仅在一定程度上降低了野外雀稗的覆盖率,但它在冷季草地上具有良好的草坪安全性,可能是MSMA的合适替代品。然而,在美索三酮在控制野地雀稗上具有商业可行性之前,还需要提高药效。
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