1 April 2006 Weed Management in Single- vs. Twin-Row Peanut (Arachis hypogaea)
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Experiments were conducted in Florida in 2000 through 2003 to evaluate weed management systems in single- and twin-row peanut utilizing either conventional or strip tillage. Diclosulam or flumioxazin preemergence (PRE) or 2,4-DB or imazapic mid-postemergence (MPOST) or late-postemergence (LPOST) was needed for greater than 95% common cocklebur control in conventional- and strip-tillage peanut. In both tillage systems, paraquat bentazon early-postemergence (EPOST) followed by (fb) 2,4-DB or imazapic MPOST, 2,4-DB or chlorimuron LPOST, or both was required for more than 80% late-season control of Florida beggarweed and control in twin-row was 5 to 10 percentage points above that observed with single-row peanut. Paraquat bentazon EPOST preceded by a diclosulam or flumioxazin PRE or fb MPOST or LPOST applications provided 80% or greater control of ivyleaf morningglory, and no differences were observed between peanut planting pattern. Paraquat bentazon EPOST fb imazapic MPOST was the only treatment that provided 90% or greater late-season sicklepod control across all years and tillage methods, and, regardless of tillage, sicklepod control was 7 percentage points better in twin- than single-row peanut. Treatments that contained diclosulam or flumioxazin PRE and paraquat bentazon EPOST fb a MPOST or LPOST herbicide application increased peanut yield compared to nontreated in conventional- and strip-tillage peanut. Averaged over all herbicide treatments, years, and tillage methods, peanut seeded in twin rows yielded 300 kg/ha more than in single rows.

Nomenclature: 2,4-DB; bentazon; diclosulam; chlorimuron; flumioxazin; imazapic; imazethapyr; paraquat; pyridate; common cocklebur, Xanthium strumarium L. #3 XANST; Florida beggarweed, Desmodium tortuosum (Sw.) DC. # DEDTO; ivyleaf morningglory, Ipomoea hederacea (L.) Jacq.; sicklepod, Senna obtusifolia L. # CASOB; peanut, Arachis hypogaea L. ‘Georgia Green’ and ‘C-99R’.

Additional index words: Narrow-row; double-row; tillage.

Abbreviations: EPOST, early-postemergence; fb, followed by; LPOST, late-postemergence; MPOST, mid-postemergence; POST, postemergence; PRE, preemergence; TSWV, tomato spotted wilt tospovirus; WAP, weeks after planting; WAT, weeks after treatment.

BARRY J. BRECKE and DANIEL O. STEPHENSON "Weed Management in Single- vs. Twin-Row Peanut (Arachis hypogaea)," Weed Technology 20(2), 368-376, (1 April 2006). https://doi.org/10.1614/WT-05-082R1.1
Published: 1 April 2006
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