Fluroxypyr Absorption and Translocation in Leafy Spurge (<i>Euphorbia esula</i>)

Lym, Rodney G.

doi:10.1017/s0043174500057039

Cited by 10 publications

(8 citation statements)

References 7 publications

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“…Forty percent of applied [i4C]-AC 263,222 was absorbed into the plant 2 OAT with no significant increase in absorption through 8 OAT (Table 1). AC 263,222 absorption by leafy spurge was greater than that reported for picloram (14%) (Lym and Moxness 1989;Moxness and Lym 1989;Thompson et al 1996) and quinclorac (0% without lutensol) (Lamoureux and Rusness 1995), similar to that reported for 2,4-0 (34 to 78%) (Lym and Moxness 1989;Thompson et al 1996) and fluroxypyr (48%) (Lym 1992) absorption, but less than that reported for imazapyr (80%) (Nissen et al 1995) and glyphosate (81 %) (Maxwell et al 1987). Imazethapyr absorption by leafy spurge ranged from 20 to 80% and was dependent on the use adjuvants, especially VAN and ammonium sulfate (AS) (Thompson et al 1996).…”

Section: Absorption Translocation and Root Releasesupporting

confidence: 81%

AC 263,222 absorption and fate in leafy spurge (Euphorbia esula)

Thompson¹,

Nissen

Masters³

1998

Weed sci.

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Absorption, translocation, and metabolism of AC 263,222 by leafy spurge were studied over 8 days. Based on the amount of herbicide applied and recovered from the leaf surfaces, 40% of applied AC 263,222 was absorbed by leafy spurge 2 days after treatment (DAT), with no further absorption observed by 8 DAT. Eight DAT 19% of applied [ 14 C]-AC 263,222 had translocated to below-ground plant parts while 4% was exuded from the roots into the sand media. AC 263,222 was not metabolized 2 DAT in the crown, root, and root buds, but 42% was metabolized in the treated leaves. Only 17% of recovered [ 14 C] was AC 263,222 in treated leaves 8 DAT (83% metabolized), while AC 263,222 accounted for 70% of recovered [ 14 C] in the root and root buds. HPLC analysis indicated that the balance of [ 14 C] was associated with a single, polar metabolite. Total recovery of [ 14 C] was 88% at 8 DAT. Nomenclature:AC 263,222; ammonium nitrate, NH 4 NO 3 ; leafy spurge, Euphorbia esula L. EPHES.

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Section: Absorption Translocation and Root Releasesupporting

confidence: 81%

AC 263,222 absorption and fate in leafy spurge (Euphorbia esula)

Thompson¹,

Nissen

Masters³

1998

Weed sci.

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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: 94%

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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“…Relative humidity directly affects the hydration and wax density of the leaf cuticle; thus, absorption and translocation of foliar-applied herbicides is typically greater under conditions of high RH (Muzik 1976;Richardson 1977). For example, Lym (1992) reported an increase in absorption and translocation of 14 C-fluroxypyr applied to leafy spurge (Euphorbia esula L.) when plants were exposed to 90% RH compared with 30% RH. However, the physiochemical properties of the leaf differ among plant species (Holloway 1970), which might explain why kochia did not respond to fluroxypyr the same as Palmer amaranth when plants were grown under controlled conditions.…”

Section: Resultsmentioning

confidence: 99%

Fluroxypyr Efficacy is Affected by Relative Humidity and Soil Moisture

2007

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An experiment was conducted in controlled environments to evaluate the effects of relative humidity (RH) and soil moisture (SM) on fluroxypyr efficacy on kochia and Palmer amaranth. Plants were grown in growth chambers with constant RH of 35 or 90 ± 5% and 28/23 C day/night temperature. Within each growth chamber, plants were grown in SM regimes of either −20 or −40 kPa. When plants were 8 to 10 cm tall, fluroxypyr was applied at 26, 52, 78, or 104 g ae ha−1; a nontreated control was included. At 21 days after treatment, control of both species increased with increasing fluroxypyr rate. Kochia control was not affected by RH, but control was greater when plants were grown in moist soil (−20 kPa) than in dry soil (−40 kPa). Conversely, Palmer amaranth control was greater when plants were grown at 90% RH than at 35% RH, but control did not differ between moist and dry soils. This study showed that the influence of environmental factors on fluroxypyr efficacy on kochia and Palmer amaranth is species dependent.

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Fluroxypyr Absorption and Translocation in Leafy Spurge (Euphorbia esula)

Cited by 10 publications

References 7 publications

AC 263,222 absorption and fate in leafy spurge (Euphorbia esula)

AC 263,222 absorption and fate in leafy spurge (Euphorbia esula)

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

Fluroxypyr Efficacy is Affected by Relative Humidity and Soil Moisture

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