Influence of Formulation and Rate on Rice Tolerance to Early-Season Applications of Acetochlor

Fogleman, M. E.; Norsworthy, Jason K.; Barber, Tom; Gbur, Edward E.

doi:10.1017/wet.2018.98

Cited by 18 publications

(20 citation statements)

References 21 publications

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“…Rice tolerance to acetochlor, butachlor, oxadiazon, pretilachlor, and thiobencarb is consistent with previous reports (Fogleman et al 2018;Kirkwood and Fletcher 1984;Wilson et al 2014). In the present study, however, substantial rice damage on both rice varieties was observed with anilofos and clomazone.…”

Section: Resultssupporting

confidence: 91%

Rice safety and control of penoxsulam-resistant and -susceptible barnyardgrass (Echinochloa crus-galli) populations with soil-applied herbicides

Liu

Fang

et al. 2021

Weed Technol

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Resistance to penoxsulam among barnyardgrass populations is prevalent in rice fields in China. Seeds of penoxsulam-resistant (AXXZ-2) and -susceptible (JLGY-3) barnyardgrass populations, as well as the seeds of two rice varieties including Wuyungeng32 (WY) and Liangyou669 (LY) were planted in plastic pots and then treated with a rate titration of acetochlor, anilofos, butachlor, clomazone, oxadiazon, pendimethalin, pretilachlor, pyraclonil, or thiobencarb. The two barnyardgrass populations exhibited similar susceptibility to acetochlor, anilofos, butachlor, oxadiazon, pretilachlor, or pyraclonil. However, the susceptibility differed between the barnyardgrass populations in response to clomazone, pendimethalin, and thiobencarb. For AXXZ-2, herbicide rates that caused 50% reduction in shoot biomass from the nontreated control (GR50) were 179, >800, and 1798 g ha-1 for clomazone, pendimethalin, and thiobencarb, respectively; while JLGY-3 GR50 values were 61, 166, and 552 g ha-1, respectively. Both rice varieties demonstrated excellent tolerance to acetochlor, butachlor, oxadiazon, pretilachlor, and thiobencarb. However, substantial rice damage was observed with anilofos and clomazone. Anilofos at 352 g ha-1 and clomazone at 448 g ha-1 reduced rice shoot biomass by 41 and 50% from the nontreated, respectively. Averaged across herbicide rates, clomazone reduced rice shoot biomass from the nontreated control by 52 and 34% for WY and LY, respectively; and pendimethalin reduced rice shoot biomass from the nontreated control by 25 and 9% for WY and LY, respectively.

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Section: Resultssupporting

confidence: 91%

Rice safety and control of penoxsulam-resistant and -susceptible barnyardgrass (Echinochloa crus-galli) populations with soil-applied herbicides

Liu

Fang

et al. 2021

Weed Technol

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“…Furthermore, the formulation of acetochlor can influence crop safety and weed control efficacy. Fogleman et al (2018) found 48% injury to rice at 2 WAA from the EC formulation, while injury from the CS formulation was only 22%. The CS formulation is a polymer coated product that slowly releases acetochlor over time which provides longer residual weed control and improved crop safety (Cahoon et al, 2015;Fogleman et al, 2018;Li et al, 2008;Rao, 2000).…”

Section: Introductionmentioning

confidence: 94%

Impact of Acetochlor Rate and Application Timing on Multiple-Herbicide-Resistant Waterhemp Control in Corn and Soybean

Symington¹,

Soltani²,

Kaastra³

et al. 2023

JAS

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Documented 6-way (Groups 2, 4, 5, 9, 14, and 27) and 5-way (Groups 2, 5, 9, 14, and 27) multiple-herbicide-resistant (MHR) waterhemp have been confirmed in the US and Canada, respectively causing corn and soybean yield losses > 70%. The objective of this study was to determine the effect of acetochlor application timing and rate on non-emerged MHR waterhemp control in corn and soybean. Acetochlor is not yet registered in Canada, but it could be useful component of an integrated MHR waterhemp control program. Two studies, one in corn and one in soybean, were conducted in southwestern Ontario, Canada from 2020 to 2022. Three rates of acetochlor were applied preplant (PP), preemergence (PRE) and postemergence (POST) to non-emerged waterhemp. In corn, acetochlor [Emulsifiable Concentrate (EC)] applied at 1,225, 2,100 and 2,950 g ai ha-1 controlled MHR waterhemp 81, 85, and 90%, respectively, at 8 weeks after POST application (WAC). Acetochlor EC applied POST or PRE provided better control than when applied PP at 4, 8, and 12 WAC. In soybean, acetochlor [Capsule suspension (CS)] applied at 1,050, 1,375, and 1,700 g ai ha-1 controlled MHR waterhemp 63, 70, and 74%, respectively, at 8 WAC. The timing of acetochlor CS application did not affect MHR waterhemp control. Acetochlor applied at the low, medium, and high rate reduced waterhemp density by 87, 89, and 92% in corn, and by 82, 84, and 87% in soybean, respectively. The high rate of acetochlor provides acceptable control of MHR waterhemp in corn; control in soybean was inadequate.

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“…At Pine Tree and Stuttgart in 2019, when compared to all other treatments, the treatment containing pendimethalin þ thiobencarb applied DPRE followed by two sequential EPOST applications of acetochlor followed by benzobicyclon postflood was much more injurious (≥41%) to the rice when evaluated at 14 d after the postflood application (Table 7). Previous research indicated that when a single microencapsulated acetochlor application was made EPOST, rice injury was tolerable (Fogleman et al 2019); however, when an emulsifiable concentrate formulation of acetochlor was applied, rice injury was not tolerable. Therefore the microencapsulated formulation of acetochlor was chosen for use in this research.…”

Section: Rice Injurymentioning

confidence: 99%

Benzobicyclon for weedy rice control in quizalofop- and imidazolinone-resistant rice systems

et al. 2022

Self Cite

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Gowan Company recently registered benzobicyclon, a WSSA Group 27 herbicide, as a postflood option in rice. It is the first 4-hydroxyphenylpyruvate dioxygenase-inhibiting herbicide commercially available in mid-southern U.S. rice production. In 2018 and 2019, field experiments were conducted across multiple sites in Arkansas to determine if the addition of benzobicyclon to quizalofop- or imidazolinone-resistant rice herbicide programs would improve weedy rice control. Across site years, one application of quizalofop, either at the 1- or 3-leaf rice stage, followed by benzobicyclon applied postflood, provided comparable weedy rice control to two sequential applications of quizalofop, which is a standard herbicide program in quizalofop-resistant rice. Additionally, treatments containing quizalofop or quizalofop followed by benzobicyclon injured rice ≤5% at 28 d after the postflood application. Across site years, at 28 d after the postflood application of benzobicyclon, all treatments containing a full-season herbicide program followed by benzobicyclon postflood provided comparable or improved weedy rice control when compared to two sequential early postemergence applications of imazethapyr. In both experiments, rice treated with benzobicyclon yielded comparably or better than treatments containing the standard herbicide program for each system. Findings from this research suggest that the use of benzobicyclon in quizalofop- and imidazolinone-resistant rice systems could be an additional and viable weedy rice control option for rice producers.

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Influence of Formulation and Rate on Rice Tolerance to Early-Season Applications of Acetochlor

Cited by 18 publications

References 21 publications

Rice safety and control of penoxsulam-resistant and -susceptible barnyardgrass (Echinochloa crus-galli) populations with soil-applied herbicides

Rice safety and control of penoxsulam-resistant and -susceptible barnyardgrass (Echinochloa crus-galli) populations with soil-applied herbicides

Impact of Acetochlor Rate and Application Timing on Multiple-Herbicide-Resistant Waterhemp Control in Corn and Soybean

Benzobicyclon for weedy rice control in quizalofop- and imidazolinone-resistant rice systems

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