Abstract
Abstract Numerous annual and perennial weeds infest sugarcane. End-season weed infestations are managed before sugarcane is replanted by fallowing (cultivation and sequential glyphosate applications) or by rotating to glyphosate-tolerant soybean in Louisiana. With the occurrence of perennial grasses and glyphosate-resistant weeds, growers need to utilize alternative late POST (LPOST) herbicide programs in soybean to reduce weed infestations in newly planted sugarcane (soybean-sugarcane rotation). Current rotational restrictions limit the use of acifluorfen, clethodim, fomesafen, and quizalofop to control troublesome weeds before soybean harvest and the subsequent planting of sugarcane. However, there is a lack of information on the carryover effects of these soybean herbicides on newly planted sugarcane. Field experiments were conducted at Schriever, LA, and St. Gabriel, LA, in 2017 to 2018 and in 2020 to 2021 to determine sugarcane injury and yield component response to herbicides labeled for LPOST applications in soybean, including acifluorfen, clethodim, fomesafen, lactofen, and quizalofop, applied at the field-use rates (1X) 45 d prior to or immediately after sugarcane planting. Separate field experiments were conducted at those two locations in Louisiana in 2018 to 2019 and in 2020 to 2021 to determine sugarcane injury and yield component response to five rates of fomesafen applied immediately after sugarcane planting. Results of the herbicide screening experiment showed no reductions in sugarcane shoot and stalk population, stalk height, sugarcane yield, sucrose content, or sucrose yield from the selected herbicides at either application timing. Fomesafen applied at 790 (2X) and 1,580 (4X) g ha −1 resulted in 7% and 13% average visible injury to sugarcane at 27 d after treatment (DAT), respectively; injury symptoms persisted until 62 DAT. Transient injury observed at 62 DAT did not correspond to reduced sugarcane stalk population, height, sucrose content, sugarcane yield, or sucrose yield. This research indicates a potentially low risk of carryover and yield loss in newly planted sugarcane from late-season applications of selected soybean herbicides.
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Claims 13
Claim · model-written summary
Selected herbicides did not reduce sugarcane shoot and stalk population at either timing.
- Taxon
- sugarcanee0
- Treatment
- selected herbicidese0
- Outcome
- sugarcane shoot and stalk populatione0
- Direction
- no reductionse0
- Qualifier
- either application timinge0
Not reportedComparator
Verbatim
e0“Results of the herbicide screening experiment showed no reductions in sugarcane shoot and stalk population, stalk height, sugarcane yield, sucrose content, or sucrose yield from the selected herbicides at either application timing.”
Claim · model-written summary
Selected herbicides did not reduce stalk height at either timing.
- Taxon
- sugarcanee0
- Treatment
- selected herbicidese0
- Outcome
- stalk heighte0
- Direction
- no reductionse0
- Qualifier
- either application timinge0
Not reportedComparator
Verbatim
e0“Results of the herbicide screening experiment showed no reductions in sugarcane shoot and stalk population, stalk height, sugarcane yield, sucrose content, or sucrose yield from the selected herbicides at either application timing.”
Claim · model-written summary
Selected herbicides did not reduce sugarcane yield at either timing.
- Taxon
- sugarcanee0
- Treatment
- selected herbicidese0
- Outcome
- sugarcane yielde0
- Direction
- no reductionse0
- Qualifier
- either application timinge0
Not reportedComparator
Verbatim
e0“Results of the herbicide screening experiment showed no reductions in sugarcane shoot and stalk population, stalk height, sugarcane yield, sucrose content, or sucrose yield from the selected herbicides at either application timing.”
Claim · model-written summary
Selected herbicides did not reduce sucrose content at either timing.
- Taxon
- sugarcanee0
- Treatment
- selected herbicidese0
- Outcome
- sucrose contente0
- Direction
- no reductionse0
- Qualifier
- either application timinge0
Not reportedComparator
Verbatim
e0“Results of the herbicide screening experiment showed no reductions in sugarcane shoot and stalk population, stalk height, sugarcane yield, sucrose content, or sucrose yield from the selected herbicides at either application timing.”
Claim · model-written summary
Selected herbicides did not reduce sucrose yield at either timing.
- Taxon
- sugarcanee0
- Treatment
- selected herbicidese0
- Outcome
- sucrose yielde0
- Direction
- no reductionse0
- Qualifier
- either application timinge0
Not reportedComparator
Verbatim
e0“Results of the herbicide screening experiment showed no reductions in sugarcane shoot and stalk population, stalk height, sugarcane yield, sucrose content, or sucrose yield from the selected herbicides at either application timing.”
Claim · model-written summary
Fomesafen at 790 (2X) caused 7% average visible injury at 27 DAT.
- Taxon
- sugarcanee0
- Treatment
- 790 (2X)e0
- Outcome
- average visible injurye0
- Direction
- injurye0
- Value
- 7%e0
- Qualifier
- 27 d after treatment (DAT)e0
Not reportedComparator
Verbatim
e0“Fomesafen applied at 790 (2X) and 1,580 (4X) g ha −1 resulted in 7% and 13% average visible injury to sugarcane at 27 d after treatment (DAT), respectively; injury symptoms persisted until 62 DAT.”
Claim · model-written summary
Fomesafen at 1,580 (4X) g ha −1 caused 13% average visible injury at 27 DAT.
- Taxon
- sugarcanee0
- Treatment
- 1,580 (4X) g ha −1e0
- Outcome
- average visible injurye0
- Direction
- injurye0
- Value
- 13%e0
- Qualifier
- 27 d after treatment (DAT)e0
Not reportedComparator
Verbatim
e0“Fomesafen applied at 790 (2X) and 1,580 (4X) g ha −1 resulted in 7% and 13% average visible injury to sugarcane at 27 d after treatment (DAT), respectively; injury symptoms persisted until 62 DAT.”
Claim · model-written summary
Injury symptoms persisted to 62 DAT.
Verbatim
e0“Fomesafen applied at 790 (2X) and 1,580 (4X) g ha −1 resulted in 7% and 13% average visible injury to sugarcane at 27 d after treatment (DAT), respectively; injury symptoms persisted until 62 DAT.”
Claim · model-written summary
Transient injury at 62 DAT did not correspond to reduced sugarcane stalk population.
Verbatim
e0“Transient injury observed at 62 DAT did not correspond to reduced sugarcane stalk population, height, sucrose content, sugarcane yield, or sucrose yield.”
Claim · model-written summary
Transient injury at 62 DAT did not correspond to reduced height.
Verbatim
e0“Transient injury observed at 62 DAT did not correspond to reduced sugarcane stalk population, height, sucrose content, sugarcane yield, or sucrose yield.”
Claim · model-written summary
Transient injury at 62 DAT did not correspond to reduced sucrose content.
Verbatim
e0“Transient injury observed at 62 DAT did not correspond to reduced sugarcane stalk population, height, sucrose content, sugarcane yield, or sucrose yield.”
Claim · model-written summary
Transient injury at 62 DAT did not correspond to reduced sugarcane yield.
Verbatim
e0“Transient injury observed at 62 DAT did not correspond to reduced sugarcane stalk population, height, sucrose content, sugarcane yield, or sucrose yield.”
Claim · model-written summary
Transient injury at 62 DAT did not correspond to reduced sucrose yield.
Verbatim
e0“Transient injury observed at 62 DAT did not correspond to reduced sugarcane stalk population, height, sucrose content, sugarcane yield, or sucrose yield.”
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