Field studies were conducted in 2003-2005 to evaluate the efficacy of imazamox applications on Clearfield® IMI-tolerant rice variety Libero (CL161) in Italian rice fields condition, both dry-seeded and water-seeded. No crop injury was observed with any treatment of imazamox in either year. In 2004 a single application of 35 to 140 g a.i. ha-1 of imazamox alone obtained 81% to 100% red rice control and 21 to 100% Echinochloa erecta control. Both years of evaluation, when imazamox was applied alone at 35 g a.i. ha-1 in a sequential post-emergence program, red rice and Heteranthera reniformis were controlled 96% or better, Schoenoplectus mucronatus and Cyperus difformis were controlled 97% or better, while Echinochloa crus-galli and Echinochloa erecta control ranged from 45 to 100% depending on herbicide rate and application method. Representative weeds of dry-seeded rice with delayed flooding system, as Panicum dichotomiflorum and Polygonum lapatifolium, were also well controlled in a sequential post-emergence program with imazamox. Adjuvant DASH HC or ammonium sulphate improved the efficacy of imazamox applications, especially against Echinochloa spp. In 2005, sequential application of imazamox mixed with propanil showed reduced efficacy on red rice, Echinochloa spp. and Schoenoplectus mucronatus, while Heteranthera reniformis control it was not influenced. Application of propanil mixed with MCPA 2 days after second treatment of imazamox in a sequential application program did not decrease overall rice weed control and could be considered a suitable strategy to avoid escapes of ALS-resistant weed populations of Schoenoplectus mucronatus, Cyperus difformis and Alisma plantago-aquatica already present in Italian rice field. Data obtained allowed to better define proper utilization of imazamox on IMI-tolerant rice variety in Italian rice fields condition. Optimization of red rice control with imazamox is one the main element to reduce risk of gene flow and to assure the possibility of Clearfield® rice technology application by Italian rice farmers. Repeated application of imazamox at 35 g a.i. ha-1 in post-emergence resulted in a very high overall weeds and red rice control, both in dry- and water-seeded system.
Evaluation of Imazamox efficacy and crop tolerance in Clearfield® rice in Italy
FERRERO, Aldo;
2007-01-01
Abstract
Field studies were conducted in 2003-2005 to evaluate the efficacy of imazamox applications on Clearfield® IMI-tolerant rice variety Libero (CL161) in Italian rice fields condition, both dry-seeded and water-seeded. No crop injury was observed with any treatment of imazamox in either year. In 2004 a single application of 35 to 140 g a.i. ha-1 of imazamox alone obtained 81% to 100% red rice control and 21 to 100% Echinochloa erecta control. Both years of evaluation, when imazamox was applied alone at 35 g a.i. ha-1 in a sequential post-emergence program, red rice and Heteranthera reniformis were controlled 96% or better, Schoenoplectus mucronatus and Cyperus difformis were controlled 97% or better, while Echinochloa crus-galli and Echinochloa erecta control ranged from 45 to 100% depending on herbicide rate and application method. Representative weeds of dry-seeded rice with delayed flooding system, as Panicum dichotomiflorum and Polygonum lapatifolium, were also well controlled in a sequential post-emergence program with imazamox. Adjuvant DASH HC or ammonium sulphate improved the efficacy of imazamox applications, especially against Echinochloa spp. In 2005, sequential application of imazamox mixed with propanil showed reduced efficacy on red rice, Echinochloa spp. and Schoenoplectus mucronatus, while Heteranthera reniformis control it was not influenced. Application of propanil mixed with MCPA 2 days after second treatment of imazamox in a sequential application program did not decrease overall rice weed control and could be considered a suitable strategy to avoid escapes of ALS-resistant weed populations of Schoenoplectus mucronatus, Cyperus difformis and Alisma plantago-aquatica already present in Italian rice field. Data obtained allowed to better define proper utilization of imazamox on IMI-tolerant rice variety in Italian rice fields condition. Optimization of red rice control with imazamox is one the main element to reduce risk of gene flow and to assure the possibility of Clearfield® rice technology application by Italian rice farmers. Repeated application of imazamox at 35 g a.i. ha-1 in post-emergence resulted in a very high overall weeds and red rice control, both in dry- and water-seeded system.
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