Effect of PRE and POST-Directed Herbicides for Season-Long Nutsedge (Cyperusspp.) Control in Bell Pepper

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Abstract

Fomesafen and imazosulfuron are two recently registered herbicides for use in Florida bell pepper. Field studies were conducted in 2012 and 2013 to evaluate PRE, POST-directed (POST-DIR), and PRE followed by (fb) POST-DIR control programs utilizing these new herbicides for nutsedge control in Florida bell pepper. PRE treatments included: S-metolachlor at 0.71 and 1.07 kg ai ha-1, fomesafen at 0.28 and 0.42 kg ai ha-1, S-metolachlor at 0.71 kg ha-1+fomesafen 0.28 kg ha-1, and S-metolachlor at 1.07 kg ha-1 + fomesafen at 0.42 kg ha-1. POST-DIR treatments included imazosulfuron at 0.21 and 0.34 kg ai ha-1. PRE fb POST-DIR treatments included S-metolachlor at 0.71 or 1.07 kg ha-1 fb imazosulfuron at 0.21 kg ha-1 and fomesafen at 0.28 or 0.42 kg ha-1 fb imazosulfuron at 0.21 kg ha-1. Nutsedge control in both years at 28 d after planting was similar among all PRE treatments providing ≤ 60% control. The addition of imazosulfuron POST-DIR following S-metolachlor or fomesafen PRE provided greater control compared to S-metolachlor or fomesafen alone 14, 21, and 28 d after the POST-DIR application. Plots treated with S-metolachlor resulted in lower marketable weight and marketable fruit count compared to fomesafen in 2012; however, this was not observed in 2013. The results for these studies indicate the importance of a PRE fb POST-DIR herbicide for nutsedge control and that fomesafen or S-metolachlor PRE fb imazosulfuron POST-DIR provides growers with a viable tool capable of achieving season-long control of nutsedge in bell pepper.

Nomenclature: Fomesafen; imazosulfuron; S-metolachlor; nutsedge, Cyperus spp.; bell pepper, Capsicum annuum L.

Fomesafen e imazosulfuron son dos herbicidas recientemente registrados para uso en pimentón en Florida. Se realizaron estudios de campo en 2012 y 2013 para evaluar programas de control PRE, POST-dirigido (POST-DIR), y PRE seguido por (fb) POST-DIR utilizando estos nuevos herbicidas para el control de Cyperus spp. en pimentón en Florida. Los tratamientos PRE incluyeron: S-metolachlor a 0.71 y 1.07 kg ai ha-1, fomesafen a 0.28 y 0.42 kg ai ha-1, S-metolachlor a 0.71 kg ha-1+fomesafen 0.28 kg ha-1, y S-metolachlor a 1.07 kg ha-1+fomesafen 0.42 kg ha-1. Los tratamientos POST-DIR incluyeron imazosulfuron a 0.21 y 0.34 kg ai ha-1. Los tratamientos PRE fb POST-DIR incluyeron S-metolachlor a 0.71 ó 1.07 kg ha-1 fb imazosulfuron a 0.21 kg ha-1, y fomesafen a 0.28ó 0.42 kg ha-1 fb imazosulfuron a 0.21 kg ha-1. El control de Cyperus spp. en ambos aËœnos a 28 d después de la siembra fue similar entre todos los tratamientos PRE siendo ≤ 60% de control. El agregar imazosulfuron POST-DIR después de S-metolachlor o de fomesafen PRE brindó mayor control al compararse con S-metolachlor o fomesafen solos 14, 21, y 28 d después de la aplicación POST-DIR. Los lotes tratados con S-metolachlor resultaron en menor peso y número de fruto comercializable al compararse con fomesafen en 2012, sin embargo esto no se observó en 2013. Los resultados de estos estudios indican la importancia de herbicidas PRE fb POST-DIR para el control de Cyperus spp. y que fomesafen o S-metolachlor PRE fb imazosulfuron POST-DIR brindan a los productores una herramienta viable capaz de alcanzar control de Cyperus spp. a lo largo de toda la temporada de crecimiento del pimentón.

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