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

• Published in: Weed technology 2014-09, Vol.28 (3), p.518-526
• Main Authors: Miller, M. Ryan, Dittmar, Peter J
• Format: Article
• Language: English
• Subjects: Bromides; Capsicum annuum; Cyperus; fomesafen; Fruits; growers; Herbicides; Hospital beds; Methyl bromide alternative; metolachlor; Peppers; Planting; Plants; Plastic film mulches; Polyethylenes; sweet peppers; vegetable weed management; Vegetables; Weed control; weed control in bell pepper; WEED MANAGEMENT—OTHER CROPS/AREAS; weeds
• ISSN: 0890-037X; 1550-2740
• DOI: 10.1614/WT-D-13-00181.1

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 0.28 ó 0.42 kg ha−1 fb imazosulfuron a 0.21 kg ha−1. El control de Cyperus