Fluroxypyr Efficacy is Affected by Relative Humidity and Soil Moisture

Lubbers, Mark D.; Stahlman, Phillip W.; Al‐Khatib, Kassim

doi:10.1614/ws-06-084.1

Cited by 15 publications

(10 citation statements)

References 18 publications

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“…Nevertheless, it is reasonable to anticipate better control results with applications to well-watered, unstressed yellow starthistle plants. Similar reductions in efficacy of auxinic herbicides under drought stress conditions have been demonstrated in many studies, e.g., Basler et al (1961) with 2,4-D on dry beans; Lubbers et al (2007) with fluroxypyr on kochia [Kochia scoparia (L.) Schrad.] and Palmer amaranth (Amaranthus palmeri S.…”

Section: Resultssupporting

confidence: 75%

Control of Yellow Starthistle (Centaurea solstitialis) and Coast Fiddleneck (Amsinckia menziesii) with Aminopyralid

Kyser¹,

Peterson²,

Orloff³

et al. 2011

Invasive plant sci. manag.

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Yellow starthistle is the most widespread broadleaf invasive plant in the western United States, and it is particularly prevalent in California. Prior to the registration of aminopyralid in 2005, the standard for chemical control of yellow starthistle was the herbicide clopyralid. We report on a compilation of several independent trials comparing the efficacy of aminopyralid and clopyralid on yellow starthistle. Treatments were applied at several rates and timings at 11 locations in four states between 2001 and 2007. Treatments were made pre-emergence and postemergence at the seedling and rosette stages of yellow starthistle. Results showed that aminopyralid, even at the low rate of 18 g ae ha−1, provided nearly complete control of yellow starthistle when treatments were made at the seedling stage. However, less consistent control (80 to 100%) resulted with applications made at the pre-emergence and rosette stages. At the seedling stage, aminopyralid is about four times more effective on yellow starthistle compared to clopyralid, based on the rate of acid equivalent. In the Central Valley of California, complete control was obtained at the lowest registered rate (53 g ae ha−1) when applications were made from December through February. At two locations we also evaluated control of the poisonous native plant coast fiddleneck. Although clopyralid does not adequately control coast fiddleneck, aminopyralid provided almost complete control when applied in the winter growing season. Applications of aminopyralid at the rosette stage resulted in a two-fold increase in annual forage grass biomass the following year. These results indicate that aminopyralid is a valuable tool for land managers and can play an important role in integrated management strategies for yellow starthistle and coast fiddleneck.

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Section: Resultssupporting

confidence: 75%

Control of Yellow Starthistle (Centaurea solstitialis) and Coast Fiddleneck (Amsinckia menziesii) with Aminopyralid

Kyser¹,

Peterson²,

Orloff³

et al. 2011

Invasive plant sci. manag.

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“…Therefore, A. palmeri grown under field condition will have better chance of survival and higher seed production due to limited periods of water stress compared with continuous water stress conditions in this study. Previous research has shown reduced control of different weed species, including A. tuberculatus , with POST herbicides when grown under high soil water stress conditions, due to reduced herbicide retention, absorption, or translocation (Lubbers et al 2007; Morrison et al 1995; Ruiter and Meinen 1998; Skelton et al 2016; Zhou et al 2007). Therefore, more research needs to be conducted regarding herbicide efficacy on A. palmeri plants under varying water stress levels.…”

Section: Resultsmentioning

confidence: 99%

Evaluating Effect of Degree of Water Stress on Growth and Fecundity of Palmer amaranth (Amaranthus palmeri) Using Soil Moisture Sensors

et al. 2018

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Palmer amaranth (Amaranthus palmeriS. Watson) is the most problematic weed in agronomic crop production fields in the United States. The objective of this study was to determine the effect of degree of water stress on the growth and fecundity ofA. palmeriusing soil moisture sensors under greenhouse conditions. TwoA. palmeribiotypes collected from Nebraska were grown in loam soil maintained at 100%, 75%, 50%, 25%, and 12.5% soil field capacity (FC) corresponding to no, light, moderate, high, and severe water stress levels, respectively. Water was regularly added to pots based on soil moisture levels detected by Watermark or Decagon 5TM sensors to maintain the desired water stress level.Amaranthus palmeriplants maintained at ≤25% FC did not survive more than 35 d after transplanting.Amaranthus palmeriat 100%, 75%, and 50% FC produced similar numbers of leaves (588 to 670 plant−1) based on model estimates; however, plants at 100% FC achieved a maximum height of 178 cm compared with 124 and 88 cm at 75% and 50% FC, respectively. The growth index (1.1×105to 1.4×105cm3plant−1) and total leaf area (571 to 693 cm2plant−1) were also similar at 100%, 75%, and 50% FC.Amaranthus palmeriproduced similar root biomass (2.3 to 3 g plant−1) at 100%, 75%, and 50% FC compared with 0.6 to 0.7 g plant−1at 25% and 12.5% FC, respectively. Seed production was greatest (42,000 seeds plant−1) at 100% FC compared with 75% and 50% FC (14,000 to 19,000 seeds plant−1); however, the cumulative seed germination was similar (38% to 46%) when mother plants were exposed to ≥50% FC. The results of this study show thatA. palmerican survive ≥50% FC continuous water stress conditions and can produce a significant number of seeds with no effect of on seed germination.

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“…Activity of foliar herbicide sprays can be influenced by the environmental conditions at the time of spraying (Ramsey, 2003;Lubbers et al, 2007;Idziak and Woznica, 2009). Effectiveness of herbicides is also strongly modified by biological properties of the target weeds and spray liquid properties.…”

Section: Resultsmentioning

confidence: 99%

Impact of tembotrione and flufenacet plus isoxaflutole application timings, rates, and adjuvant type on weeds and yield of maize

Idziak

Woźnica

2014

Chilean J. Agric. Res.

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Due to the steadily increasing cost of weed control in corn (Zea mays L.) and possible negative impact of chemicals on environment the demand for less and more efficient herbicide use is rising. Field studies were carried out in 2010 and 2011 in the Middle-West Poland in order to assessment the effective weed control. Treatments included herbicides tembotrione and flufenacet + isoxaflutole at recommended (88.0 and 36.0 + 7.5 g ha -1 ) and reduced rates (44 and 22 g ha -1 ; 19.2 + 4.0 or 9.6 + 2.0 g ha -1 ) with addition of methylated seed oil (MSO) and ammonium nitrate (AMN) adjuvants. Tembotrione was applied once at the stage of 3-5 maize leaves and flufenacet + isoxaflutole once at pre-emergence of maize. Mixtures of these herbicides were applied sequentially post-emergence, at 16-20-d intervals, after successive weed emergence. Results indicate that herbicide applied at reduced rates with adjuvants provided satisfactory weed control in maize. Application of reduced rates of tembotrione (44 and 22 g ha -1) and especially mixture of tembotrione with flufenacet + isoxaflutole and MSO + AMN adjuvants applied twice provided similar grain yield of maize as from treatments where tembotrione or flufenacet + isoxaflutole herbicides were applied only once at recommended rates (9.5, 9.7, and 10.0 t ha -1 , respectively).

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Fluroxypyr Efficacy is Affected by Relative Humidity and Soil Moisture

Cited by 15 publications

References 18 publications

Control of Yellow Starthistle (Centaurea solstitialis) and Coast Fiddleneck (Amsinckia menziesii) with Aminopyralid

Control of Yellow Starthistle (Centaurea solstitialis) and Coast Fiddleneck (Amsinckia menziesii) with Aminopyralid

Evaluating Effect of Degree of Water Stress on Growth and Fecundity of Palmer amaranth (Amaranthus palmeri) Using Soil Moisture Sensors

Impact of tembotrione and flufenacet plus isoxaflutole application timings, rates, and adjuvant type on weeds and yield of maize

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