Status of weed control in imidazolinone-herbicide resistant rice in Rio Grande do Sul

Ulguim, André da Rosa; Fruet, Bruno L.; Merotto, Aldo; Silva, Anelise L.

doi:10.51694/advweedsci/2021;39:00007

Cited by 12 publications

(7 citation statements)

References 22 publications

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“…was first identified in 2000 1 and is one of the main problems related to weed control in rice. 2 The acetyl-CoA carboxylase (ACCase) inhibiting herbicides are largely used to control ALSresistant biotypes. However, resistance to these herbicides has increased in recent years.…”

Section: Introductionmentioning

confidence: 99%

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The safener isoxadifen‐ethyl confers fenoxaprop‐p‐ethyl resistance on a biotype of Echinochloa crus‐galli

Cutti

Rigon

Girelli

et al. 2022

Pest Management Science

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BACKGROUND: Some herbicides are commercially formulated with safeners to increase crop selectivity. Fenoxaprop-p-ethyl is formulated with the safener isoxadifen-ethyl for Echinochloa crus-galli control in rice. Safeners act on crops by increasing herbicide metabolism, but this effect may also occur in weeds. The objective of this study was to investigate the effect of the safener isoxadifen-ethyl on the resistance to fenoxaprop-p-ethyl in a biotype of E. crus-galli.RESULTS: A screening of 52 biotypes identified lack of control in the biotype SANTPAT-R treated with the recommended dose of 69 g ha −1 of the commercial formulation of fenoxaprop-p-ethyl with the safener isoxadifen-ethyl. While this biotype survived doses greater than 2208 g ha −1 of the formulation fenoxaprop-p-ethyl + isoxadifen-ethyl, it was killed with 69 g ha −1 of fenoxaprop-p-ethyl without the safener. A glutathione-s-transferase (GST) enzymes inhibitor reduced the resistance factor in two dose-response curves. A minor effect of a CytP450 inhibitor was observed. The previous spraying of the safener isoxadifen-ethyl followed by fenoxaprop-p-ethyl induced survival in the resistant but not in the susceptible biotype. The GST1 and GSTF1 genes were up-regulated in the resistant biotype. ACCase gene mutations were not found, and no cross-resistance to other ACCase inhibitors was identified.CONCLUSION: The safener isoxadifen-ethyl present in the commercial herbicide formulation of fenoxaprop-p-ethyl is associated with resistance in the E. crus-galli SANTPAT-R biotype. This resistance is related with herbicide metabolization mediated by GST pathways. This is the first field-selected weed biotype with herbicide resistance due to safener presence in the sprayed formulation.

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Section: Introductionmentioning

confidence: 99%

“…Resistance to acetolactate synthase (ALS) inhibiting herbicides in Echinochloa spp. was first identified in 2000 1 and is one of the main problems related to weed control in rice 2 . The acetyl‐CoA carboxylase (ACCase) inhibiting herbicides are largely used to control ALS‐resistant biotypes.…”

Section: Introductionmentioning

confidence: 99%

The safener isoxadifen‐ethyl confers fenoxaprop‐p‐ethyl resistance on a biotype of Echinochloa crus‐galli

Cutti

Rigon

Girelli

et al. 2022

Pest Management Science

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“…Nevertheless, due to the exclusive and continuous use of this technology for more than 4 yr in succession, weeds resistant to ALS-inhibiting herbicides increased by 58% in relation to the area and 35% in number of cases (Ulguim et al 2019(Ulguim et al , 2021. This has caused management of resistant weeds to become more complex, resulting in a more than 200% rise in the cost of producing flooded rice crops (Merotto et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…The main alternative management practice for resistant weeds used in southern Brazil is a ricesoybean [Glycine max (L.) Merr.] crop rotation, established in up to 25% of the total rice production area (Ulguim et al 2021). Another practice is related to the rice production system.…”

Section: Introductionmentioning

confidence: 99%

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Surveys of weed management on flooded rice yields in southern Brazil

et al. 2021

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One of the main limiting factors for high yields of flooded rice (Oryza sativa L.) is the presence of weeds, especially herbicide-resistant weeds. The aim of this study was to evaluate the association of weed management practices adopted by flooded rice farmers in the State of Rio Grande do Sul (RS) to grain yield. For this purpose, 324 interview surveys were administered to farmers who supplied information about the history of weed management and yields. The answers to the survey indicated that weedy rice (Oryza sativa L.) and Echinochloa sp. were the most important weeds that occurred in flooded rice areas in RS. Advanced growth stage of weeds and inadequate environmental conditions such as air temperature and relative humidity were listed as the main reasons for the low weed control efficacy. Farmers achieved greater rice yields when adopted rice-soybean [Glycine max (L.) Merr.] (9,140 kg ha−1 average yield) and herbicide site of action rotations (8,801 kg ha−1 average yield) along with tank-mixes (8,580 kg ha−1 average yield) as specific management practices for resistant weed control. The use of glyphosate with residual herbicides in tank-mix in rice spiking stage is the main factor related to greater yields. The postemergence applications and their relations with delaying of flooded rice is a factor that reduces rice yield when no spiking glyphosate applications was made. Identification of the most important weeds in terms of occurrence, as well as the knowledge of the main agronomic practices adopted by the farmers, are essential so that recommendations for integrated management practices can be adopted in an increasingly accurate and sustainable-flooded rice areas in Southern Brazil.

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Evapotranspiration and crop coefficients of sprinkler-irrigated aerobic rice in southern Brazil using the SIMDualKc water balance model

Petry,

Tonetto,

Martins

et al. 2024

Irrig Sci

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Status of weed control in imidazolinone-herbicide resistant rice in Rio Grande do Sul

Abstract: This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided that the original author and source are credited.

Cited by 12 publications

References 22 publications

The safener isoxadifen‐ethyl confers fenoxaprop‐p‐ethyl resistance on a biotype of Echinochloa crus‐galli

The safener isoxadifen‐ethyl confers fenoxaprop‐p‐ethyl resistance on a biotype of Echinochloa crus‐galli

Surveys of weed management on flooded rice yields in southern Brazil

Evapotranspiration and crop coefficients of sprinkler-irrigated aerobic rice in southern Brazil using the SIMDualKc water balance model

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