TY - JOUR
T1 - Alternative Herbicides for the Management of Clethodim-Resistant Rigid Ryegrass (Lolium rigidum) in Faba Bean (Vicia faba L.) in Southern Australia
AU - Saini, Rupinder Kaur
AU - Kleemann, Samuel G.L.
AU - Preston, Christopher
AU - Gill, Gurjeet S.
N1 - Publisher Copyright:
© 2015, BioOne. All rights reserved.
PY - 2015/8/1
Y1 - 2015/8/1
N2 - Two field experiments were conducted during 2012 and 2013 at Roseworthy, South Australia to identify effective herbicide options for the management of clethodim-resistant rigid ryegrass in faba bean. Dose-response experiments confirmed resistance in both field populations (B3, 2012 and E2, 2013) to clethodim and butroxydim. Sequencing of the target site of acetyl coenzyme A carboxylase gene in both populations identified an aspartate-2078-glycine mutation. Although resistance of B3 and E2 populations to clethodim was similar (16.5- and 21.4-fold more resistant than the susceptible control SLR4), the B3 population was much more resistant to butroxydim (7.13-fold) than E2 (2.24-fold). Addition of butroxydim to clethodim reduced rigid ryegrass plant density 60 to 80% and seed production 71 to 88% compared with the standard grower practice of simazine PPI plus clethodim POST. Clethodim + butroxydim combination had the highest grain yield of faba bean (980 to 2,400 kg ha-1). Although propyzamide and pyroxasulfone plus triallate PPI provided the next highest levels of rigid ryegrass control (< 60%), these treatments were more variable and unable to reduce seed production (6,354 to 13,570 seeds m-2) to levels acceptable for continuous cropping systems. Nomenclature: Clethodim; rigid ryegrass, Lolium rigidum Gaudin; faba bean, Vicia faba L.
AB - Two field experiments were conducted during 2012 and 2013 at Roseworthy, South Australia to identify effective herbicide options for the management of clethodim-resistant rigid ryegrass in faba bean. Dose-response experiments confirmed resistance in both field populations (B3, 2012 and E2, 2013) to clethodim and butroxydim. Sequencing of the target site of acetyl coenzyme A carboxylase gene in both populations identified an aspartate-2078-glycine mutation. Although resistance of B3 and E2 populations to clethodim was similar (16.5- and 21.4-fold more resistant than the susceptible control SLR4), the B3 population was much more resistant to butroxydim (7.13-fold) than E2 (2.24-fold). Addition of butroxydim to clethodim reduced rigid ryegrass plant density 60 to 80% and seed production 71 to 88% compared with the standard grower practice of simazine PPI plus clethodim POST. Clethodim + butroxydim combination had the highest grain yield of faba bean (980 to 2,400 kg ha-1). Although propyzamide and pyroxasulfone plus triallate PPI provided the next highest levels of rigid ryegrass control (< 60%), these treatments were more variable and unable to reduce seed production (6,354 to 13,570 seeds m-2) to levels acceptable for continuous cropping systems. Nomenclature: Clethodim; rigid ryegrass, Lolium rigidum Gaudin; faba bean, Vicia faba L.
KW - Herbicide strategies
KW - PPI herbicides
KW - target site mutation
KW - weed control
UR - http://www.scopus.com/inward/record.url?scp=84939227964&partnerID=8YFLogxK
U2 - 10.1614/WT-D-14-00143.1
DO - 10.1614/WT-D-14-00143.1
M3 - Article
AN - SCOPUS:84939227964
VL - 29
SP - 578
EP - 586
JO - Weed Technology
JF - Weed Technology
SN - 0890-037X
IS - 3
ER -