Methiozolin sorption and mobility in sand-based root zones

Flessner, Michael L.; Wehtje, Glenn; McElroy, J. Scott; Howe, Julie A.

doi:10.1002/ps.3896

Cited by 12 publications

(7 citation statements)

References 46 publications

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“…can germinate from depths of 6 to 8 cm (Benvenuti et al 2001; Chauhan and Johnson 2008; Hoyle et al 2013). Methiozolin does not move below 2 cm deep within normal putting green soils (Flessner et al 2015), and methiozolin’s water solubility (3.4 mg L –1 ) and logK ow value (3.9) indicates that it has a high capacity for retention in the upper portion of the soil (Koo et al 2010). A portion of goosegrass and smooth crabgrass plants may germinate below methiozolin.…”

Section: Resultsmentioning

confidence: 99%

Methiozolin rate and application frequency influence goosegrass (Eleusine indica) and smooth crabgrass (Digitaria ischaemum) control in turf

Peppers,

McElroy,

Orlinski

et al. 2024

Weed Technol

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Methiozolin is labeled for goosegrass and smooth crabgrass control in golf course putting greens, but no peer-reviewed literature exists regarding this use. Greenhouse experiments were conducted evaluating goosegrass and smooth crabgrass response to increasing rates of methiozolin as affected by weed growth stage. In general, as weed growth stage increased, the methiozolin rate required to reduce weed biomass 90% (WR90) increased. Goosegrass was more sensitive to preemergence-applied methiozolin than smooth crabgrass, and the WR90 was 30.4 and 118 g ai ha-1 for goosegrass and smooth crabgrass, respectively. However, smooth crabgrass was generally more sensitive to postemergence-applied methiozolin than goosegrass. Subsequent field studies were conducted to evaluate goosegrass and smooth crabgrass control with methiozolin applied singularly or sequentially at standard preemergence timings. Results indicated methiozolin applied singularly or sequentially at the label-recommended rate (500 g ha-1) is not persistent enough to provide season-long control of goosegrass and smooth crabgrass. Ten field studies were conducted in Alabama, California, Florida and Virginia to evaluate frequent methiozolin application programs with the objective of providing selective, season-long goosegrass and smooth crabgrass control. Results from these studies indicate methiozolin can be safely applied to hybrid bermudagrass and creeping bentgrass putting greens despite exceeding the yearly maximum use rate for putting greens (2500 g ha-1) with some treatments. Methiozolin effectively controlled smooth crabgrass throughout the growing season in California and Virginia when ten biweekly applications were applied at 250 g ha-1 or higher. In Florida, methiozolin did not acceptably (80%) control goosegrass regardless of application rate. In Virginia, methiozolin acceptably controlled goosegrass only when applied at rates and frequencies that exceeded the maximum yearly methiozolin usage rate. These data indicate that methiozolin has the potential to control smooth crabgrass preemergence when applied frequently, but does not provide acceptable goosegrass control at labeled rates.

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Section: Resultsmentioning

confidence: 99%

Methiozolin rate and application frequency influence goosegrass (Eleusine indica) and smooth crabgrass (Digitaria ischaemum) control in turf

Peppers,

McElroy,

Orlinski

et al. 2024

Weed Technol

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“…When methiozolin was applied, 75% creeping bentgrass recovery required an additional 1.5 wk on average at CC2 but no additional time at CC1 (Table 5). Due to the general immobility of methiozolin in soil, substantial root loss is likely required to elicit creeping bentgrass injury from methiozolin in most cases (Brosnan et al 2013; Flessner et al 2015). Murphy et al (1993) observed a 16% decrease in root weight density following cultivation, most likely due to root severing and trauma to the soil.…”

Section: Resultsmentioning

confidence: 99%

Effect of core cultivation, fertility, and plant growth regulators on recovery of voided creeping bentgrass greens canopies following annual bluegrass control via methiozolin

Venner¹,

Ervin

Koo

et al. 2023

Weed Technol

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Methiozolin is commonly used for the safe and selective removal of annual bluegrass from creeping bentgrass golf greens. Studies were conducted in 2013 and 2014 with the objective of assessing fertility programs consisting of synthetic fertilizers and biostimulants, with and without the plant growth regulator trinexapac-ethyl, to aid putting green canopy recovery following annual bluegrass removal via methiozolin. Additional studies were conducted to compare recovery of creeping bentgrass following an aggressive core aerification event with fertility programs with and without methiozolin. In all cases, the addition of 7 kg ha-1 of N, P, and K from fertilizer or biostimulant biweekly to greens increased turfgrass recovery time by 1 to 3 wk compared to a standard green’s fertility program alone. Creeping bentgrass treated with biostimulants recovered equivalent to or quicker than creeping bentgrass treated with synthetic fertilizer (SF) in all cases. In the presence of methiozolin treatments, trinexapac-ethyl reduced time to 90% recovery (T90) by 0.25 to 0.5 wk at two locations and increased T90 recovery time by 0.1 wk at one location. Otherwise, SF plus trinexapac-ethyl treated plots were equivalent to SF-only plots. Methiozolin slowed turfgrass recovery time at one location where severe drought stress occurred but not at the other location that did not experience drought stress. These results suggest that turf managers should increase fertilizer treatments but will not need to discontinue trinexapac-ethyl use to maximize creeping bentgrass recovery following annual bluegrass control with methiozolin. These data also suggest that methiozolin has the potential to negatively affect creeping bentgrass recovery when drought stress is experienced.

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“…Methiozolin's water solubility (3.4 mg L −1 ) and log K ow value (3.9) indicates that it has a high capacity for retention in the upper portion of the soil (Koo et al 2010). Further studies by Flessner et al (2015) confirmed that methiozolin does not readily move within the soil profile and is not likely to leach.…”

Section: Introductionmentioning

confidence: 96%

Dissipation of spring-applied methiozolin in turfgrass systems

Peppers,

Hwang,

Koo

et al. 2024

Weed Sci

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Methiozolin is applied five or more times per year to control annual bluegrass (Poa annua L.) in cool, temperate areas, but high market demand in the Southern US and recent registration in Australia expands the products use in variable climates. To better design weed control programs for variable turf types, more information is needed to characterize methiozolin dissipation in different turf systems. Methiozolin was applied biweekly thrice to a Kentucky bluegrass (Poa pratensis L.) lawn and adjacent bare soil in New Jersey and on twelve hybrid bermudagrass [Cynodon dactylon (L.) Pers. x transvaalensis Burtt Davy] putting greens in Virginia. Soil samples were collected immediately following each application and biweekly for 12 additional weeks. Methiozolin was extracted from each soil sample and analyzed using liquid chromatography with tandem mass spectrometry. Methiozolin was detected only within the top 2 cm of the soil (including verdure), but not below 2 cm, demonstrating limited vertical mobility of methiozolin. Dissipation was significantly faster in turf-covered soil compared to bare soil. The time required for 50% methiozolin dissipation was 13 and 3.5 d in bare soil and turf-covered soil, respectively. In Virginia, methiozolin dissipation in the one-month span of three sequential applications differed between years. Methiozolin concentration immediately following the third biweekly application to C. transvaalensis x dactylon greens was approximately 105 and 180% of the concentration immediately following the initial application, in 2021 and 2022, respectively. This difference in methiozolin accumulation following three applications was attributed to differential C. transvaalensis x dactylon greenup during methiozolin treatments each year. Despite differences in post-treatment methiozolin concentration between years, the temporal dissipation rate later into the summer was consistent. Following the final application on C. transvaalensis x dactylon greens, methiozolin dissipated 50 and 90% in 14 and 46 d, respectively. These data suggest that methiozolin dissipates more rapidly in turfgrass systems than in bare soil.

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Methiozolin sorption and mobility in sand-based root zones

Abstract: Approximately 24% of applied methiozolin is available for root uptake, and mobility is limited, suggesting resistance to loss through leaching displacement.

Cited by 12 publications

References 46 publications

Methiozolin rate and application frequency influence goosegrass (Eleusine indica) and smooth crabgrass (Digitaria ischaemum) control in turf

Methiozolin rate and application frequency influence goosegrass (Eleusine indica) and smooth crabgrass (Digitaria ischaemum) control in turf

Effect of core cultivation, fertility, and plant growth regulators on recovery of voided creeping bentgrass greens canopies following annual bluegrass control via methiozolin

Dissipation of spring-applied methiozolin in turfgrass systems

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