Abstract
ALS-inhibiting herbicides usually provide adequate weed control in irrigated rice fields. After consecutive years of use, the Cyperaceae species, globe fringerush (Fimbristylis miliacea) began to show resistance to ALS (acetolactate synthase) inhibitors. Globe fringerush is one of the most problematic herbicide-resistant weeds in irrigated rice in the state of Santa Catarina in the South of Brazil. The objective of this research was to examine cross resistance of globe fringerush to ALS inhibitors, under field conditions. Two experiments were conducted in a rice field naturally infested with ALS-resistant globe fringerush in Santa Catarina, in the 2008/09 and 2009/10 cropping seasons. The experimental units were arranged in randomized complete block design, with five replicates, consisting of two factors (herbicide and dose) in a 4 x 5 factorial arrangement. ALS herbicides included bispyribac-sodium, ethoxysulfuron, pyrazosulfuron-ethyl and penoxsulam. Six-leaf globe fringerush was sprayed with herbicide doses of 0, 0.5, 1, 2 and 4X the recommended doses in a spray volume of 200 L ha-1. The number of rice culm, filled and sterile grains, plant height, dry shoot biomass and grain yield were recorded. Globe fringerush control was evaluated 28 and 70 days after herbicide application (DAA); shoots were harvested at 13 weeks after herbicide application and dry weight recorded. Competition with globe fringerush reduced the number of culm and rice grain yield. The globe fringerush biotype in this field was resistant to all ALS herbicides tested. Penoxsulam had the highest level of activity among treatments at 28 and 70 DAA, but the control level was only 50% and 42%, respectively, in the second year of assessment. This was not enough to prevent rice yield loss. Alternative herbicides and weed control strategies are necessary to avoid yield losses in rice fields infested with ALS-resistant biotypes of globe fringerush.
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Claims 8
Claim · model-written summary
Globe fringerush competition reduced rice culm number.
- Taxon
- rice
Oryza sativae0 - Interactor
- globe fringerushe0weed
- Outcome
- number of culme0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Competition with globe fringerush reduced the number of culm and rice grain yield”
Claim · model-written summary
Globe fringerush competition reduced rice grain yield.
- Taxon
- riceOryza sativae0
- Interactor
- globe fringerushe0weed
- Outcome
- rice grain yielde0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Competition with globe fringerush reduced the number of culm and rice grain yield”
Claim · model-written summary
The field globe fringerush biotype resisted all tested ALS herbicides.
- Taxon
- riceOryza sativat0
- Interactor
- globe fringerushe0weed
- Outcome
- resistant to all ALS herbicides testede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The globe fringerush biotype in this field was resistant to all ALS herbicides tested”
t0“rice”
Claim · model-written summary
Penoxsulam had the highest activity among herbicides.
- Taxon
- riceOryza sativat0
- Treatment
- Penoxsulame0
- Interactor
- globe fringerusht0weed
- Outcome
- level of activitye0
- Direction
- higheste0
- Comparator
- treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Penoxsulam had the highest level of activity among treatments at 28 and 70 DAA”
t0“globe fringerush (Fimbristylis miliacea) cross resistance to als-inhibitor herbicides under field conditions in irrigated rice”
Claim · model-written summary
Penoxsulam control reached only 50% at 28 days in year two.
- Taxon
- riceOryza sativat0
- Treatment
- Penoxsulame1
- Interactor
- globe fringerusht0weed
- Outcome
- control levele0
- Value
- 50%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the control level was only 50% and 42%, respectively, in the second year of assessment”
t0“globe fringerush (Fimbristylis miliacea) cross resistance to als-inhibitor herbicides under field conditions in irrigated rice”
e1“Penoxsulam had the highest level of activity among treatments at 28 and 70 DAA”
Claim · model-written summary
Penoxsulam control reached only 42% at 70 days in year two.
- Taxon
- riceOryza sativat0
- Treatment
- Penoxsulame1
- Interactor
- globe fringerusht0weed
- Outcome
- control levele0
- Value
- 42%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the control level was only 50% and 42%, respectively, in the second year of assessment”
t0“globe fringerush (Fimbristylis miliacea) cross resistance to als-inhibitor herbicides under field conditions in irrigated rice”
e1“Penoxsulam had the highest level of activity among treatments at 28 and 70 DAA”
Claim · model-written summary
This weed control did not prevent rice yield loss.
- Taxon
- riceOryza sativae0
- Interactor
- globe fringerusht0weed
- Outcome
- rice yield losse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was not enough to prevent rice yield loss”
t0“globe fringerush (Fimbristylis miliacea) cross resistance to als-inhibitor herbicides under field conditions in irrigated rice”
Claim · model-written summary
The authors recommend alternative herbicides and weed control strategies to avoid rice yield losses.
- Taxon
- riceOryza sativae0
- Interactor
- globe fringerushe0weed
- Outcome
- Alternative herbicides and weed control strategiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alternative herbicides and weed control strategies are necessary to avoid yield losses in rice fields infested with ALS-resistant biotypes of globe fringerush”
The same questions in other papers
Penoxsulam · control · Oryza sativa (rice)Positive and negative results
9 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
7 papers more in this group
See all 11 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.