Palmer amaranth (Amaranthus palmeri) control affected by weed size and herbicide spray solution with nozzle type pairings

• DOI: 10.1017/wet.2023.92
• Publication Date: 2023-12-22T07:48:05Z
• Authors: Koffi Badou-Jerem...; Thomas R. Butts; Jason K. Norsworthy; Jason Davis; Leonard B. Piveta
• Keywords: Glufosinate; Dicamba

Abstract Palmer amaranth can grow 4.2 mm in height per degree day; hence, delays of a few days weed control deployment result applications herbicides to weeds that are larger than those for which the herbicide label recommends. Therefore, it is critically necessary understand effect plant size at time application conjunction with spray solution and nozzle type pairings on effectiveness management programs Enlist E3 XtendFlex production systems. Field experiments were conducted 2020, no-crop conditions, two locations Arkansas, evaluate influence its glufosinate, dicamba, 2,4-D applied alone mixture specific as mandated by requirements. Also, laboratory experiment was droplet velocity solutions nozzles used field experiments. A 5- 10-percentage point reduction observed when dicamba (66%) (63%) alone, respectively, compared mixed glufosinate (71% 73%, respectively). density increased 55, 73, 100, 115, 140 plants m −2 sprayed heights 15, 25, 41, 61, 76 cm, they 5 cm tall (9 ). Nozzle did not affect or density. The percentage driftable fines alone. Effective short-term long-term chemical will require growers correctly their practices overlay residuals, expect need sequential applications.