Sensitivity of weedy rice populations to Quizalofop
Oliveira Neto, Antonio M. Guerra, Naiara Coffin, Maxwell Burgos, Nilda R. Andrade, Alexander de Noldin, José A.
Sensitivity of weedy rice populations to Quizalofop
Publicação on-line; 25 ref.; 1 table; 2 illus.; Summary (En)
ABSTRACT
Background: Rice lines displaying resistance to quizalofop-p-ethyl
(quizalofop), an acetyl coenzyme A carboxylase (ACCase)-inhibiting
herbicide, were developed to facilitate control of imidazolinone-resistant
weedy rice (red rice), as well as other susceptible grasses.
Objective: To assess the sensitivity of weedy rice accessions from Brazil
to quizalofop.
Methods: Two bioassays were conducted on the greenhouse from March
to June 2016, in a completely random design with a two-factor factorial
combination of treatments and four replications. The factor A was weedy
rice accession and factor B was quizalofop rates (0, 25 and 50 g a.i. ha-1).
It was assessed a total of 84 genotypes in the two bioassays, composed
of 78 weedy rice accessions, 4 rice cultivars, and 2 lines resistant to
aryloxyphenoxypropionate (AOPP) herbicides. Quizalofop was applied
the 2-leaf stage. Weedy rice control was evaluated at 28 and 22 days
after treatment (DAT), respectively for bioassay I and II, using a scale of
0% (no control) to 100% (dead).
Results: All weedy rice accessions were susceptible to quizalofop, being
controlled 100% with 50 g a.i. ha-1. Rice lines SC 964 and SC 965,
resistant to AOPP herbicides, were not injured by quizalofop.
Conclusions: quizalofop is an effective tool for weedy rice control in
ACCase-resistant rice.
Keywords:
aryloxyphenoxypropionate
ACCase inhibitor
red rice
Oryza sativa.
ORYZA SATIVA
ARROZ
ARROZ VERMELHO
INIBIDOR DE ENZIMA
HERBICIDA
Sensitivity of weedy rice populations to Quizalofop
Publicação on-line; 25 ref.; 1 table; 2 illus.; Summary (En)
ABSTRACT
Background: Rice lines displaying resistance to quizalofop-p-ethyl
(quizalofop), an acetyl coenzyme A carboxylase (ACCase)-inhibiting
herbicide, were developed to facilitate control of imidazolinone-resistant
weedy rice (red rice), as well as other susceptible grasses.
Objective: To assess the sensitivity of weedy rice accessions from Brazil
to quizalofop.
Methods: Two bioassays were conducted on the greenhouse from March
to June 2016, in a completely random design with a two-factor factorial
combination of treatments and four replications. The factor A was weedy
rice accession and factor B was quizalofop rates (0, 25 and 50 g a.i. ha-1).
It was assessed a total of 84 genotypes in the two bioassays, composed
of 78 weedy rice accessions, 4 rice cultivars, and 2 lines resistant to
aryloxyphenoxypropionate (AOPP) herbicides. Quizalofop was applied
the 2-leaf stage. Weedy rice control was evaluated at 28 and 22 days
after treatment (DAT), respectively for bioassay I and II, using a scale of
0% (no control) to 100% (dead).
Results: All weedy rice accessions were susceptible to quizalofop, being
controlled 100% with 50 g a.i. ha-1. Rice lines SC 964 and SC 965,
resistant to AOPP herbicides, were not injured by quizalofop.
Conclusions: quizalofop is an effective tool for weedy rice control in
ACCase-resistant rice.
Keywords:
aryloxyphenoxypropionate
ACCase inhibitor
red rice
Oryza sativa.
ORYZA SATIVA
ARROZ
ARROZ VERMELHO
INIBIDOR DE ENZIMA
HERBICIDA
BINAGRI