Italian Ryegrass (Lolium multiflorum) Management in Winter Wheat (Triticum aestivum) with AE F130060 plus AE F115008

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Title: Italian Ryegrass (Lolium multiflorum) Management in Winter Wheat (Triticum aestivum) with AE F130060 plus AE F115008
Author: Crooks, Lane
Advisors: Alan York, Committee Chair
Abstract: Diclofop-resistant Italian ryegrass has become a major problem throughout the southeastern United States. AE F130060 plus AE F115008 are herbicides currently under development that are equally effective on diclofop- susceptible and -resistant Italian ryegrass. Field and greenhouse experiments were conducted to investigate the use of these herbicides in North Carolina. In a cultivar tolerance study conducted at weed-free locations, the cultivars 'Coker 9663', 'Coker 9704', and 'Pioneer 2580' were most tolerant of AE F130060 plus AE F115008, the cultivars 'FFR 555', and 'Pioneer 2684' were intermediate in tolerance, and the variety 'Jackson' was least tolerant. Yield reductions were attributed to fewer kernels per spike in treated versus non-treated wheat. AE F130060 plus AE F115008 injured weed-free wheat 27% and reduced yield 7% when the safener, AE F107892, was not included. Yield reductions were not observed with herbicide:safener ratios of 1:1 or 1:3 applied to 3-leaf, 2-tiller, or 6-tiller wheat. Increased Italian ryegrass control was noted when AE F130060 plus AE F115008 was applied with nitrogen as the carrier, however increased crop injury was a concern in trials conducted on weed-free wheat. Italian ryegrass control by AE F130060 plus AE F115008 was not affected in a tank mixture with thifensulfuron plus tribenuron. Reduced control was noted in the field and greenhouse when AE F130060 plus AE F115008 was mixed with 2,4-D or dicamba. No tank mixture affected wheat injury. In an adjuvant comparison study, the inclusion of an adjuvant with AE F130060 plus AE F115008 accelerated Italian ryegrass control 3 WAT compared to application without an adjuvant. Control by the herbicides was similar with or without an adjuvant at 6 and 10 WAT. The adjuvants tested included nonionic surfactants, an organosilicone surfactant, and crop oil concentrate. Both weed-free and Italian ryegrass-infested wheat treated with the herbicides alone and mixed with adjuvants produced similar yields. A wash-off study conducted in the greenhouse suggested the rainfree requirement for AE F130060 plus AE F115008 was 2 h.
Date: 2003-03-17
Degree: PhD
Discipline: Crop Science
URI: http://www.lib.ncsu.edu/resolver/1840.16/5200


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