Effects of environmental factors on the herbicidal activity and phytotoxicity of ipfencarbazone

Kasahara, Tatsuya; Takeuchi, Takashi; Koyama, Kohei; Kuzuma, Seiichi

doi:10.1584/jpestics.d18-024

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…a herbicide-treated layer on the soil surface regardless of soil texture or rate of water leakage. 3,8) In this study, it was shown that ipfencarbazone strongly inhibits the growth of the third and fourth leaves in late watergrass but not in rice in a hydroponic culture (Fig. 2Aa, Ba).…”

Section: Discussionmentioning

confidence: 66%

Characterization of very long chain fatty acid synthesis inhibition by ipfencarbazone

et al. 2019

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Ipfencarbazone exhibits excellent herbicidal activity against Echinochloa spp. and is safe for rice. The effects of ipfencarbazone on very long chain fatty acid (VLCFA) elongation in rice and late watergrass and its inhibitory mechanism were investigated in this study. Although ipfencarbazone inhibited VLCFA elongation in the microsomes prepared from late watergrass and rice at low concentrations, the inhibitory effect was higher in late watergrass than in rice. These results suggested that the primary site of action of ipfencarbazone is VLCFA elongase (VLCFAE) and ipfencarbazone has a differential affinity between the VLCFAEs of the plants. The inhibitory activity of ipfencarbazone became higher in proportion to pre-incubation period with the VLCFAE. The degree of inhibition did not decrease by dilution of the VLCFAE-ipfencarbazone complex. These results suggested that ipfencarbazone binds to the VLCFAE irreversibly.

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Section: Discussionmentioning

confidence: 66%

Characterization of very long chain fatty acid synthesis inhibition by ipfencarbazone

et al. 2019

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“…ha −1 of 750 g L −1 cinmethylin, the percentages of plant height, fresh weight, and plant survival of L. multiflorum and A. myosuroides all reached zero in the greenhouse. These divergences are mostly related to the differences in greenhouse culture conditions, field climate, temperature and humidity, soil, and other conditions [32][33][34]. Under the greenhouse culture, the reductions in L. multiflorum in emergence and aboveground biomass were more than 85% and 90%, respectively, at a dose of 400 g a.i.…”

Section: Discussionmentioning

confidence: 99%

Herbicidal Activity of Cinmethylin against Grass Weeds and Its Safety for Use with Different Wheat Varieties

Xu,

Leng,

et al. 2024

Agronomy

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Cinmethylin is a potential pre-emergence herbicide that could be used to control grass weeds in winter cereals. To determine the herbicidal activity of cinmethylin against common gramineous weeds in wheat fields in China and its level of safety on wheat, we conducted the following experiments: (i) assessing the efficacy of cinmethylin against 11 grass weeds and (ii) determining its safety against 19 wheat varieties. The results showed that cinmethylin had good herbicidal efficacy against annual bluegrass (Poa annua L.), shortawn foxtail (Alopecurus aequalis Sobol.), slender meadow foxtail (Alopecurus myosuroides Huds.), Japanese foxtail (Alopecurus japonicus Steud.), Italian ryegrass (Lolium multiflorum Lam.), British timothy (Phleum paniculatum Huds.), Asia Minor bluegrass (Polypogon fugax Nees ex Steud.), Helictotrichon tibeticum (Roshev.) Holub., and wild oat (Avena fatua L.), with a GR50 (the herbicide dose resulting in 50% growth inhibition) value of 4.50–99.21 g a.i. ha−1 in plant height and 1.43–70.34 g a.i. ha−1 in fresh weight. However, cinmethylin cannot control Japanese brome (Bromus japonicus L.) or Tausch’s goatgrass (Aegilops tauschii Coss.) at a dose of 200 g a.i. ha−1. Different wheat varieties varied in their phytotoxicity to cinmethylin. Overall, there is a phytotoxicity risk when using cinmethylin on wheat, mainly to wheat roots, with a reduction in root length of 40.81–64.09% at a dose of 400 g a.i. ha−1. These findings indicate that the pre-emergence herbicide cinmethylin provides good efficacy against most grass weeds and may possess potential for weed management in wheat fields. However, attention should be given to the application dosage and the sensitivity of wheat varieties when using cinmethylin in wheat fields.

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“…Under greenhouse conditions, a flood loss of 2 cm per day after applying ipfencarbazone resulted in a comparable dry shoot weight of Echinochloa spp. compared to no flood loss, explaining that a small amount of flood loss equated to little herbicide loss or reduction in efficacy (Kasahara et al 2018). However, a flood loss in a commercial rice field would likely lead to large amounts of water being lost and potentially losing herbicide depending on the route of water loss.…”

Section: Introductionmentioning

confidence: 99%

Flood timing and flood loss impact on effectiveness of florpyrauxifen-benzyl coated on urea in rice

Cotter,

Norsworthy,

Butts

et al. 2024

Weed Technol

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Florpyrauxifen-benzyl applications generated complaints and concerns around rice injury and off-target movement to soybean after the commercial launch in 2018. A precise application method for florpyrauxifen-benzyl was imperative for its continued use. Experiments were conducted in 2020 and 2021 to evaluate rice weed control as influenced by preflood application interval and flood loss following florpyrauxifen-benzyl at 30 g ai ha-1 applied as a spray or coated on urea. In the preflood application experiment, coating florpyrauxifen-benzyl on urea and applying it the day of flood establishment, 5, and 10 d prior to flooding (DPTF) resulted in lower yellow nutsedge, broadleaf signalgrass, and barnyardgrass control than when the herbicide was spray at 3 and 5 wk after final treatment (WAFT). Coating florpyrauxifen-benzyl on urea only provided 61 to 63% yellow nutsedge control at 3 and 5 WAFT, which was 35 to 37 percentage points lower than when spray applied at 5 or 10 DPTF. Likewise, rice yields following applications of florpyrauxifen-benzyl coated on urea were 1200 kg ha-1 less than yields following spray applications. Florpyrauxifen-benzyl coated on urea and clomazone provided lower levels of weed control than spraying the herbicide, suggesting an explanation for the yield losses. The timing of flood loss experiment suggested that when florpyrauxifen-benzyl coated on urea at 30 g ai ha-1 was applied preflood and flood was relinquished at 2 hours, 24 hours, and 7 d after flood establishment, hemp sesbania and yellow nutsedge control were not affected. However, loss of floodwater 2 hours after flood establishment resulted in lower barnyardgrass control than when the flood was lost 24 hours and 7 d after flooding. Generally, the period between a herbicide application and flooding completion should be minimized to aid in weed control. These results indicate the importance of maintaining a flood for weed control and nutrient management.

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Effects of environmental factors on the herbicidal activity and phytotoxicity of ipfencarbazone

Cited by 5 publications

References 14 publications

Characterization of very long chain fatty acid synthesis inhibition by ipfencarbazone

Characterization of very long chain fatty acid synthesis inhibition by ipfencarbazone

Herbicidal Activity of Cinmethylin against Grass Weeds and Its Safety for Use with Different Wheat Varieties

Flood timing and flood loss impact on effectiveness of florpyrauxifen-benzyl coated on urea in rice

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