A bioassay evaluation of pyroxasulfone behavior in prairie soils

Szmigielski, Anna M.; Johnson, Eric N.; Schoenau, Jeff J.

doi:10.1584/jpestics.d13-073

Cited by 12 publications

(12 citation statements)

References 20 publications

(33 reference statements)

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“…Pyroxasulfone is a residual, soil‐applied, pre‐emergent herbicide for the control of annual ryegrass ( Lolium rigidum Lam. ), barley grass ( Hordeum leporinum ), annual phalaris ( Phalaris minor ), silver grass ( Vulpia bromoides ) and toad rush ( Juncus bufonius ), and the suppression of certain grass weeds in wheat (not durum wheat) and triticale . Pyroxasulfone is an isoxazoline herbicide with a mode of action that inhibits cell division and very‐long‐chain fatty acids synthesis …”

Section: Introductionmentioning

confidence: 99%

“…), barley grass (Hordeum leporinum), annual phalaris (Phalaris minor), silver grass (Vulpia bromoides) and toad rush (Juncus bufonius), and the suppression of certain grass weeds in wheat (not durum wheat) and triticale. [28][29][30] Pyroxasulfone is an isoxazoline herbicide with a mode of action that inhibits cell division and very-long-chain fatty acids synthesis. 31,32 Lafond et al 33 reported significant economic and crop management advantages, such as faster harvest and easier seeding, when crops were cut high at harvest, then seeded between the residue rows in the following season.…”

Section: Introductionmentioning

confidence: 99%

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Pyroxasulfone efficacy for annual ryegrass control is affected by wheat residue height, amount and orientation

Khalil

Flower

Siddique

et al. 2019

Pest Management Science

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BACKGROUND Pre‐emergent herbicides play an important role in conservation agriculture, however, crop residues on the soil surface in these systems can intercept a considerable amount of herbicide during application. Cutting crops relatively high at harvest has some advantages, such as allowing faster harvest, and this also means that there is less horizontal residue on the soil surface. This field study tested the impact of standing wheat residue height and amount of horizontal residue on the interception, leaching and weed‐control efficacy of the pre‐emergent herbicide pyroxasulfone in the 2015 and 2016 growing seasons. RESULTS Spray coverage of pyroxasulfone declined from 14.6% to 7.5% with increasing amounts (0 to 4 t ha−1) of horizontal wheat residue. Horizontal wheat residue at 1 t ha−1 had 10.3% spray coverage (more herbicide interception) compared with 15.4% for the equivalent amount of standing residue. Greater amounts of horizontal residue also significantly reduced the efficacy of pyroxasulfone in controlling ryegrass in the field and decreased pyroxasulfone concentrations in the soil. Rainfall after herbicide application increased herbicide efficacy for all residue amounts. Generally, cutting standing residue higher resulted a relatively small decrease in spray coverage at the soil surface and weed control efficacy, and this was significant only between nil stubble and 0.3 m cut height. CONCLUSION Cutting residue relatively high, leaving less on the surface, improves spray coverage and herbicide efficacy compared with having more horizontal residue. This research may assist farmers and advisors to maximize the efficacy of pre‐emergent herbicide in no‐tillage systems. © 2019 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pyroxasulfone efficacy for annual ryegrass control is affected by wheat residue height, amount and orientation

Khalil

Flower

Siddique

et al. 2019

Pest Management Science

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“…Higher rates of pyroxasulfone were required to achieve similar control of wild oats and false cleavers ( Galium spurium L.) at locations in Alberta and Saskatchewan as soil organic matter increased (Tidemann et al 2014). Szmigielski et al (2014) measured pyroxasulfone bioactivity across 25 different prairie soils and reported decreased activity in soils with low pH, although Westra et al (2014) observed no correlation between soil adsorption and soil acidity. Pyroxasulfone is nonionizable, and therefore soil pH does not affect dissociation.…”

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Influence of Tillage on Control of Wild Oat (Avena fatua) by the Soil-applied Herbicide Pyroxasulfone

et al. 2017

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Wild oat control options are limited in western Canada due to resistance to most common herbicides. Control of wild oat with pyroxasulfone, a soil-applied, very-long-chain fatty-acid inhibitor, was investigated. A series of greenhouse and field experiments were conducted to isolate the effects of vertical seed position, site of herbicide interception, and tillage on wild oat control with pyroxasulfone in comparison with triallate. In greenhouse experiments, wild oat shoot length (soil surface to leaf tip) was reduced (P<0.05) in shallow-seeded wild oat compared with deep-seeded wild oat with pyroxasulfone (6.2 and 9.8 cm, respectively) and triallate (3.7 and 13.2 cm, respectively). Soil-applied pyroxasulfone remained in the top 2.5 cm of the soil with or without a simulated rainfall event. Pyroxasulfone was most effective if either the seed or the shoot 1 cm above the seed intercepted the herbicide layer. If a wild oat emerges from deeper in the soil profile, the sensitive part of the seedling may not intercept an effective rate of pyroxasulfone in the soil. In field experiments comparing deep- and shallow-seeded wild oat treated with pyroxasulfone and triallate in fields with and without tillage, there were no significant effects of tillage alone on wild oat shoot length. Deep-seeded wild oat emerged early, and while herbicides reduced shoot growth, shoots were >10 cm. Shallow-seeded wild oat had delayed emergence, possibly due to reduced soil moisture, and herbicides reduced shoot growth to <10cm. Pyroxasulfone is likely to be more effective in no-till fields where wild oat seeds are not located deep in the soil.

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“…(1 (King and Garcia 2008) has been observed; however, both studies were conducted on high pH soils ( ]8) which may have affected weed control (Szmigielski et al 2014).…”

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Weed control in soybean using pyroxasulfone and sulfentrazone

2015

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. 2015. Weed control in soybean using pyroxasulfone and sulfentrazone. Can. J. Plant Sci. 95: 1199Á1204. Pyroxasulfone and sulfentrazone are new herbicides currently being evaluated for weed control in soybean [Glycine max (L.) Merr.] in Ontario, Canada. Seven experiments were conducted over a 3-yr period (2011 to 2013) at Ridgetown and Exeter, Ontario, to evaluate weed management using pyroxasulfone, sulfentrazone and their tank-mixes relative to the industry standard, imazethapyr plus metribuzin. Tank-mixing pyroxasulfone and sulfentrazone provided up to 97, 46, 60, 100 and 71% control of common lambsquarters (Chenopodium album L.), common ragweed (Ambrosia artemisiifolia L.), green foxtail [Setaria viridis (L.) Beauv.], Powell amaranth [Amaranthus powellii (S.) Wats.] and velvetleaf (Abutilon theophrasti Medic.), respectively, at 2 wk after treatment. Control with pyroxasulfone and sulfentrazone was improved when tank-mixed, relative to application of each herbicide separately. Although control was variable across weed species, no difference in control was identified between pyroxasulfone plus sulfentrazone and imazethapyr plus metribuzin. Soybean yield was up to 2.7, 2.4 and 2.9 t ha(1 for pyroxasulfone, sulfentrazone and pyroxasulfone plus sulfentrazone application, yet imazethapyr plus metribuzin provided the highest yield (3.3 t ha(1 ). This research demonstrates that pyroxasulfone plus sulfentrazone may be used as a valuable weed control option in soybean; however, weed community composition may limit herbicidal utility.

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A bioassay evaluation of pyroxasulfone behavior in prairie soils

Cited by 12 publications

References 20 publications

Pyroxasulfone efficacy for annual ryegrass control is affected by wheat residue height, amount and orientation

Pyroxasulfone efficacy for annual ryegrass control is affected by wheat residue height, amount and orientation

Influence of Tillage on Control of Wild Oat (Avena fatua) by the Soil-applied Herbicide Pyroxasulfone

Weed control in soybean using pyroxasulfone and sulfentrazone

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