Abstract
Research was conducted in 2007 and 2008 to evaluate weed-control options in an imazethapyr-resistant rice production system. Raised beds were formed, and imidazolinone-resistant hybrid rice ‘CL 730’ was drill-seeded on beds. Five herbicide programs applied up to the four- to six-leaf stage of rice were evaluated with and without additional “as-needed” herbicide at later stages. All the herbicide combinations and as-needed herbicides tested in this research were labeled for rice, and only minor transient injury (< 5%) was initially observed. Weeds emerged throughout the growing season, and as-needed herbicides were applied after the four- to six-leaf stage of rice to control these late-emerging weeds and weeds not effectively controlled with earlier applications, primarily Palmer amaranth. Most of the Palmer amaranth at this site was insensitive to imazethapyr (possibly acetolactate synthase resistant). Therefore, application of as-needed herbicides with different modes of action, such as 2,4-D, were used to improve Palmer amaranth control. Rice yields were often numerically higher in plots that received additional herbicide after the six-leaf stage of rice, but yields were not significantly improved.
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Claims 5
Claim · model-written summary
The labeled herbicide combinations caused only minor transient rice injury below 5%.
- Taxon
- rice
Oryza sativae0 - Treatment
- herbicide combinations and as-needed herbicidese0
- Outcome
- minor transient injurye0
- Direction
- minore0
- Value
- < 5%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All the herbicide combinations and as-needed herbicides tested in this research were labeled for rice, and only minor transient injury (< 5%) was initially observed.”
Claim · model-written summary
Weeds emerged throughout the rice growing season.
- Taxon
- RiceOryza sativat0
- Interactor
- Weedse0weed
- Outcome
- Weeds emerged throughout the growing seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weeds emerged throughout the growing season”
t0“Rice”
Claim · model-written summary
Most Palmer amaranth at the site was insensitive to imazethapyr.
- Taxon
- RiceOryza sativat0
- Interactor
- Palmer amaranthe0weed
- Outcome
- Palmer amaranth at this site was insensitive to imazethapyre0
- Qualifier
- possibly acetolactate synthase resistante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most of the Palmer amaranth at this site was insensitive to imazethapyr (possibly acetolactate synthase resistant).”
t0“Rice”
Claim · model-written summary
Additional herbicides with different modes of action improved Palmer amaranth control.
- Taxon
- RiceOryza sativat0
- Treatment
- as-needed herbicides with different modes of actione0
- Interactor
- Palmer amaranthe0weed
- Outcome
- Palmer amaranth controle0
- Direction
- improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of as-needed herbicides with different modes of action, such as 2,4-D, were used to improve Palmer amaranth control.”
t0“Rice”
Claim · model-written summary
Additional herbicide after the six-leaf stage often raised rice yields numerically, without significant improvement.
- Taxon
- RiceOryza sativae0
- Treatment
- additional herbicide after the six-leaf stage of ricee0
- Outcome
- Rice yieldse0
- Direction
- numerically highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice yields were often numerically higher in plots that received additional herbicide after the six-leaf stage of rice, but yields were not significantly improved.”
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