Effect of Temperature on Picloram Absorption and Translocation in Leafy Spurge (<i>Euphorbia esula</i>)

Lym, Rodney G.

doi:10.1017/s0043174500051328

Cited by 8 publications

(8 citation statements)

References 10 publications

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“…Low temperatures likely reduced aminocyclopyrachlor and fluroxypyr efficacy for swinecress control more than triclopyr or 2,4-D + dicamba + MCPP. These results are consistent with previous reports of reductions in efficacy of synthetic auxins in cool weather from less absorption and mobility in targeted weeds (Lym and Messersmith, 1990;Radosevich and Bayer, 1979).…”

Section: Resultssupporting

confidence: 93%

Application Timing of Aminocyclopyrachlor, Fluroxypyr, and Triclopyr Influences Swinecress Control in Tall Fescue

Reed¹,

McCullough²

2012

horts

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Swinecress [Coronopus didymus (L.) Sm.] is a problematic weed in newly seeded tall fescue (Festuca arundinacea Schreb.) and often warrants control with herbicides. The objective of this research was to investigate the influence of application timing on efficacy of aminocyclopyrachlor, fluroxypyr, and triclopyr for swinecress control compared with dichlorophenoxyacetic acid (2,4-D) + 3,6-dichloro-o-anisic acid (dicamba) + methylchlorophenoxypropionic acid (MCPP). Aminocyclopyrachlor at 0.05 and 0.10 kg a.i./ha provided less than 35% control from February applications, but both rates averaged greater than 90% control with April applications. Fluroxypyr at 0.26 and 0.52 kg a.i./ha provided poor (less than 70%) control from February applications but control increased to 71% and 90% from April treatments, respectively. Triclopyr at 0.56 and 1.12 kg a.i./ha provided greater than 90% swinecress control at both application timings and was comparable to 2,4-D + dicamba + MCPP. Overall, aminocyclopyrachlor and fluroxypyr were only effective for controlling swinecress in April, whereas triclopyr provided excellent control with February and April applications.

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Section: Resultssupporting

confidence: 93%

Application Timing of Aminocyclopyrachlor, Fluroxypyr, and Triclopyr Influences Swinecress Control in Tall Fescue

Reed¹,

McCullough²

2012

horts

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“…Absorption of 14 C-quinclorac averaged 79% within 48 HAT in leafy spurge (Lamoureux and Rusness 1995). However, picloram absorption was less than 30% in several studies (Lym and Messersmith 1990;Lym and Moxness 1989), while fluroxypyr absorption ranged from 39% when leafy spurge was in the vegetative stage to 24% in the postflower stage (Lym 1992b). A maximum of 40% of imazapic was absorbed in leafy spurge within 48 HAT (Thompson et al 1998).…”

Section: Resultsmentioning

confidence: 95%

Comparison of Aminocyclopyrachlor Absorption and Translocation in Leafy Spurge (Euphorbia esula) and Yellow Toadflax (Linaria vulgaris)

Lym

2014

Weed sci.

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Aminocyclopyrachlor has provided excellent control of many perennial weed species including leafy spurge, but control of yellow toadflax has been inconsistent.14C-aminocyclopyrachlor absorption was rapid in both leafy spurge and yellow toadflax and averaged 72% 48 h after treatment (HAT). However, translocation within the plant differed by species. More14C translocated to the aboveground portion of yellow toadflax (28% of applied) compared to leafy spurge (16.5% of applied). There was rapid translocation of14C-label to the roots of both species but more reached the belowground portion of leafy spurge than yellow toadflax. Over 12% of applied14C translocated into leafy spurge roots within 24 HAT but declined to 2% by 192 HAT. In comparison, only 2% of applied14C was found in yellow toadflax roots 24 HAT, and just 0.15% remained in belowground plant parts by 192 HAT. The inconsistent long-term control of yellow toadflax with aminocyclopyrachlor is likely due to poor translocation to the root system, which would allow for rapid regrowth in this hard to control perennial species.

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“…An average of 1.1 and 1.4% of applied 14 C moved to the below treated led and root sections, respectively, and was not affected by temperature. In contrast, absorption of 14 C-picloram increased 1% for each 1º C increase in temperature, but translocation to the root system declined as temperature increased (11). Occasional poor leafy spurge control may be due to application during periods of temperature fluctuation adverse to picloram absorption and translocation.…”

Section: Temperaturementioning

confidence: 91%

“…Although the 14 C-fluroxypyr concentration in leafy spurge roots was highest when applied in the vegetative growth stage, percent of applied herbicide translocated to roots was similar regardless of growth stage (Table 1). In contrast, picloram translocation to leafy spurge roots was greatest during flowering and seed-set growth stages (11). Occasionally, fluroxypyr has provided better leafy spurge control than picloram during the seed-set growth stage (17), especially during drought conditions (8).…”

Section: Growth Stagementioning

confidence: 99%

Fluroxypyr Absorption and Translocation in Leafy Spurge (Euphorbia esula)

Lym

1992

Weed sci.

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Absorption and translocation of14C-fluroxypyr were determined for leafy spurge at various growth stages, under differing relative humidity and temperature conditions, and when applied with picloram or 2,4-D. Absorption of14C-fluroxypyr was greater in vegetative plants (39%) than in flowering or postflowering plants (25%), while total translocated to roots averaged 2% of applied herbicide regardless of growth stage. Greater14C-fluroxypyr absorption and translocation occurred in plants exposed to high relative humidity (>90%) compared to low humidity (<30%) for 6 h or longer following treatment. Absorption and translocation to roots was independent of temperature (18 or 24 C). Absorption and translocation declined by 50% when applied with picloram or 2,4-D. However, absorption and translocation of14C-picloram or14C-2,4-D were not affected by fluroxypyr. Fluroxypyr would likely be used in a leafy spurge control program only during environmental conditions adverse to control with picloram such as unseasonably warm or cold temperatures or in areas with a high water table.

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Effect of Temperature on Picloram Absorption and Translocation in Leafy Spurge (Euphorbia esula)

Cited by 8 publications

References 10 publications

Application Timing of Aminocyclopyrachlor, Fluroxypyr, and Triclopyr Influences Swinecress Control in Tall Fescue

Application Timing of Aminocyclopyrachlor, Fluroxypyr, and Triclopyr Influences Swinecress Control in Tall Fescue

Comparison of Aminocyclopyrachlor Absorption and Translocation in Leafy Spurge (Euphorbia esula) and Yellow Toadflax (Linaria vulgaris)

Fluroxypyr Absorption and Translocation in Leafy Spurge (Euphorbia esula)

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