Efficacy of fall-applied residual herbicides on weedy rice control in rice (Oryza sativa L.)

Bertucci, Matthew B.; Fogleman, M. E.; Norsworthy, Jason K.

doi:10.1017/wet.2019.24

Cited by 6 publications

(7 citation statements)

References 28 publications

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“…While Bertucci et al. (2019) reported an average weedy rice control across herbicide rates of 43% and 34% 5 weeks after planting with acetochlor and pyroxasulfone, respectively, this study showed an increase in weedy rice control for the two different herbicides (Tables 2 and 4). In 2020 at 28 DAE, acetochlor achieved the lowest control at 21% and 38% for the low and high rates, respectively.…”

Section: Resultscontrasting

confidence: 57%

“…Like Bertucci et al (2019), a low level of rice injury was observed from fall applications of acetochlor (<10%); however, pyroxasulfone caused unacceptable rice injury (>30%) (Tables 2 and 3). At 14 DAE, acetochlor (averaged over rate and use of fenclorim) injured rice only 5%, while pyroxasulfone increased injury to 44%.…”

Section: Rice Tolerancementioning

confidence: 89%

“…Additional evaluations showed again that the safest application timing was at the one‐ to two‐leaf stage of rice and that a microencapsulated formulation should be utilized for adequate crop tolerance. Furthermore, studies have considered the use of WSSA Group 15 herbicides as fall applications for weedy rice control (Bertucci et al., 2019). With fall applications of various WSSA Group 15 herbicides, including acetochlor and pyroxasulfone, rice injury was ≤11% and provided 59% and 53% weedy rice control, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, using a preemergence herbicide that controls weedy rice would reduce the number of plants that need to be controlled with postemergence applications, potentially reducing the number of escapes that could outcross back to the weedy rice population (Norsworthy, personal communication 2021). Based on these criteria, the use of very long‐chained fatty acid elongase (VLCFA)‐inhibiting herbicides has been investigated for the past several years in mid‐southern U.S. rice production systems (Avent et al., 2020; Bertucci et al., 2019; Fogleman, 2018; Godwin, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Fenclorim rice safening and weed control with fall‐applied acetochlor and pyroxasulfone

Avent

Norsworthy

Butts

et al. 2023

Agrosystems Geosci & Env

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Applications of very long-chained fatty acid elongase (VLCFA)-inhibiting herbicides are currently not labeled within U.S. rice (Oryza sativa L.) production but have been used in Asian rice production to suppress weedy rice and control other annual grasses and small-seeded broadleaves. Therefore, separate experiments were initiated in the fall of 2019 and 2020 to evaluate rice tolerance and weedy rice (O. sativa L.) control with acetochlor and pyroxasulfone in the following spring. A three-factor experiment within a randomized complete block design was implemented with the factors being (1) herbicide choice (acetochlor or pyroxasulfone), (2) a low or high herbicide rate (2100 and 4200 g ai ha −1 , and at 237 and 475 g ai ha −1 acetochlor and pyroxasulfone, respectively), and (3) without or with a fenclorim seed treatment (2.5 g ai kg −1 of seed). Throughout the experiments, rice exhibited <10% injury with acetochlor.The fenclorim seed treatment reduced injury (averaged over herbicide choice and rate) from 28% to 21% 28 days after emergence of rice for both trial types. Fenclorim also improved rough-rice yield (averaged over herbicide choice and rate) by 12 and 18 percentage points for the two different studies. However, regardless of fenclorim, rice did not demonstrate <20% injury with pyroxasulfone. The fenclorim seed treatment or any interaction containing fenclorim did not influence weedy rice control, and weedy rice control with acetochlor ranged from 0% to 48%. Findings from this experiment demonstrate the effects of a fenclorim seed treatment for fall-applied acetochlor and pyroxasulfone and the efficacy of acetochlor and pyroxasulfone for controlling weedy rice. INTRODUCTIONWeedy rice (Oryza sativa L.) is one of the most troublesome weeds for flooded-rice (O. sativa L.

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Section: Resultscontrasting

confidence: 57%

Section: Rice Tolerancementioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fenclorim rice safening and weed control with fall‐applied acetochlor and pyroxasulfone

Avent

Norsworthy

Butts

et al. 2023

Agrosystems Geosci & Env

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“…No cultivo do arroz, entre outros desafios, o controle de plantas daninhas é importante para manutenção do potencial produtivo, já que o manejo das plantas indesejadas pode acarretar em grandes perdas de produtividade, decorrentes da elevada capacidade destas competirem por água, luz e nutriente com a cultura de interesse (BERTUCCI et al 2019).…”

Section: Introductionunclassified

Interação do tratamento de sementes e da mistura em tanque de herbicidas na seletividade para o arroz irrigado

Catoni¹,

Neto

Riscarolli³

et al. 2020

Rev. Ciênc. Agrovet.

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Interação do tratamento de sementes e da mistura em tanque de herbicidas na seletividade para o arroz irrigadoInteraction of seed treatment and herbicide tank mixture in paddy rice selectivity RESUMO A elevada fitointoxicação após a aplicação de herbicidas tem se tornado cada vez mais frequentes em função da mistura em tanque de herbicidas praticada a campo, pressionadas pelo aumento do espectro de controle e pelo avanço da resistência de plantas daninhas a herbicidas. Objetivou-se, neste trabalho avaliar a interação do tratamento de sementes com uma formulação comercial de fungicida e inseticida com a aplicação de mistura em tanque de herbicidas no arroz irrigado, cultivado no sistema prégerminado, na região do Alto Vale do Itajaí, SC. O experimento foi conduzido em uma área comercial sistematizada para o sistema pré-germinado, com a cultivar SCS 121 CL. O delineamento experimental utilizado foi o de blocos casualizados com tratamentos arranjados em esquema fatorial 4 x 2, com quatro repetições. Avaliou-se dois níveis de tratamento de sementes (com ou sem) e quatro tratamentos herbicidas (sem herbicida, [imazapyr + imazapic] + bentazon, [imazapyr + imazapic] + saflufenacil e [imazapyr + imazapic] + bentazon + saflufenacil). A primeira aplicação foi realizada em V2 apenas com a mistura comercial de [imazapyr + imazapic] e a segunda aplicação foi realizada em V3 com tratamentos. As variáveis avaliadas foram fitointoxicação, número de plantas por metro quadrado, número de perfilhos por planta, número de panículas por metro quadrado, número de grãos por panícula, massa da panícula, esterilidade de espiguetas, massa de mil grãos e produtividade de grãos. Concluiu-se que o tratamento de sementes com a mistura formulada de fungicida e inseticida reduziu a fitointoxicação da mistura de [imazapyr + imazapic] + bentazon + saflufenacil. Além disso, houve superioridade numérica nos componentes de rendimento e na produtividade de grãos com o tratamento de semente. ABSTRACTIncreased phytointoxication level after herbicide tank mixtures has been frequent in field conditions, pressured by the improvement of the control spectrum and the advance of herbicide-resistant biotypes. The objective of this work was to assess the interaction of seed treatment with a commercial formulation of fungicide and insecticide with herbicide tank mixture after the application in paddy rice, in the pregerminated seed system, in the Alto Vale do Itajaí region. To carry out the experiment in the commercial field prepared for the pre-germinated seed system, sowing SCS 121 CL cultivar. The experimental design was a block completely randomized with treatments organized in factorial design 4 x 2, with four replications. We assessed two levels seed treatment (with or without) and four herbicide treatments (without herbicide, [imazapyr + imazapic] + bentazon, [imazapyr + imazapic] + saflufenacil, and [imazapyr + imazapic] + bentazon + saflufenacil). The first spray was carried out in V2 only with the commercial mixture of [imazapyr + imazapic], and the sec...

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Rice tolerance to acetochlor with a fenclorim seed treatment

et al. 2022

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Rice producers in the U.S. need effective herbicides to control problematic weeds. Previous research has demonstrated that acetochlor can provide in-season weed control in rice; however, undesirable injury is common. Thus, trials were initiated in 2020 and 2021 to evaluate 1) rice cultivar tolerance to microencapsulated (ME) acetochlor with the use of a fenclorim seed treatment at 2.5 g ai kg-1 of seed, 2) a dose-response of a fenclorim seed treatment with ME acetochlor, and 3) rice tolerance to fenclorim and ME acetochlor under cool, wet conditions. For all trials, acetochlor was applied delayed-preemergence (4 to 7 days after planting). In the dose-response trials and in the presence of acetochlor, the fenclorim seed treatment rate of 2.5 g ai kg-1 reduced rice injury and increased rice plant heights and shoot numbers relative to acetochlor without fenclorim and was comparable to the nontreated control in all evaluations. In the cultivar screening, 14 of 16 cultivars exhibited < 20% injury with acetochlor at 1,260 g ai ha-1 and fenclorim at 2.5 g ai kg-1 2 weeks after emergence (WAE) at the Pine Tree Research Station (PTRS). At the Rice Research and Extension Center (RREC) 2 and 4 WAE and PTRS 4 WAE, all cultivars exhibited < 20% injury with acetochlor and fenclorim. The fenclorim seed treatment in the presence of acetochlor provided comparable rice plant height, shoot numbers, groundcover, and rough rice yield to the nontreated control. Under cool, wet conditions, rice injury without fenclorim ranged from 15 to 60% with acetochlor at 1,050 g ai ha-1, while injury from acetochlor with the fenclorim seed treatment ranged from 0 to 20%. Based on the results of these experiments, the fenclorim seed treatment appears to safen an assortment of rice cultivars from injury caused by ME acetochlor.

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Efficacy of fall-applied residual herbicides on weedy rice control in rice (Oryza sativa L.)

Cited by 6 publications

References 28 publications

Fenclorim rice safening and weed control with fall‐applied acetochlor and pyroxasulfone

Fenclorim rice safening and weed control with fall‐applied acetochlor and pyroxasulfone

Interação do tratamento de sementes e da mistura em tanque de herbicidas na seletividade para o arroz irrigado

Rice tolerance to acetochlor with a fenclorim seed treatment

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