Control of Amaranthus quitensis in soybean crops in Argentina : an alternative to reduce herbicide use

Vitta, J. I.; Faccini, Delma; Nisensohn, Luisa

doi:10.1016/s0261-2194(00)00039-9

Cited by 14 publications

(14 citation statements)

References 2 publications

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“…This species is a widespread weed in agricultural systems in many countries. In Argentina, it is a common weed in current cropping systems that has biotypes known to be susceptible to glyphosate [3]. However, the weed has been cited as being resistant to ALS inhibitors [4] and to glyphosate [5].…”

Section: Introductionmentioning

confidence: 99%

First Report of Amaranthus hybridus with Multiple Resistance to 2,4-D, Dicamba, and Glyphosate

et al. 2018

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In many countries, Amaranthus hybridus is a widespread weed in agricultural systems. The high prolificacy and invasive capacity as well as the resistance of some biotypes to herbicides are among the complications of handling this weed. This paper reports on the first A. hybridus biotypes with resistance to auxinic herbicides and multiple resistance to auxinic herbicides and the EPSPs inhibitor, glyphosate. Several dose response assays were carried out to determine and compare sensitivity of six population of A. hybridus to glyphosate, 2,4-D, and dicamba. In addition, shikimic acid accumulation and piperonil butoxide effects on 2,4-D and dicamba metabolism were tested in the same populations. The results showed four populations were resistant to dicamba and three of these were also resistant to 2,4-D, while only one population was resistant to glyphosate. The glyphosate-resistant population also showed multiple resistance to auxinic herbicides. Pretreatment with piperonil butoxide (PBO) followed by 2,4-D or dicamba resulted in the death of all individual weeds independent of herbicide or population.

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Section: Introductionmentioning

confidence: 99%

First Report of Amaranthus hybridus with Multiple Resistance to 2,4-D, Dicamba, and Glyphosate

et al. 2018

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“…, 1995). Infestations of this weed can cause reduction in yields of summer crops by competition (Vitta et al. , 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Amaranthus quitensis Kunth is one of the most important annual weeds in Argentina (de la Fuente et al, 1995). Infestations of this weed can cause reduction in yields of summer crops by competition (Vitta et al, 2000). In recent years the species has declined with increasing use of transgenic cultivars of soya bean tolerant to glyphosate (Vitta et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Germination characteristics of Amaranthus quitensis as affected by seed production date and duration of burial

Faccini¹,

Vitta

2005

Weed Research

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Summary Thermal requirements for the germination of Amaranthus quitensis, a common annual weed in Argentina, were studied. In addition, temporal changes in dormancy from seeds produced at different times during the growing season were examined. For this second objective, thermal and light requirements for germination were tested in seeds buried at different depths, with or without crop residues. Base and optimum temperatures for germination rates were 12.8°C and 37°C respectively. At dispersal time, maximum percentage germination was 60–70% and this was generally recorded at 35°C/25°C in a 14‐h photoperiod. Seed germination tended to increase in later seed collection dates. Seeds of A. quitensis showed seasonal changes in germinability in the soil. In winter, germination of retrieved seeds increased to over 90% until summer, after which there was a decrease until the following winter when germination was close to 40%. There were no differences in germinability between burial depths and crop residue levels. Germination requirements for alternating temperatures and light tended to disappear after burial. Initial viability was 99% and declined slightly during burial. Soil temperature seems to play a crucial role not only by regulating seasonal changes in dormancy, but also by defining the percentage and the germination rate in non‐dormant seeds.

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“…In their study, when a rate of 30 g a.i. ha −1 of imazethapyr was applied, weed control was acceptable for all species evaluated, except Ambrosia artemisiifolia L. Vitta et al. (2000) found that the optimal doses of imazethapyr for Amaranthus spp.…”

Section: Discussionmentioning

confidence: 86%

“…The economically optimal dose of herbicides is strongly influenced by weed infestation levels and weed size. Vitta et al. (2000) found that optimal doses of imazethapyr for Amaranthus quitensis Kunth.…”

Section: Introductionmentioning

confidence: 99%

Interactions between reduced rate of imazethapyr and multiple weed species–soyabean interference in a semi‐arid environment

Yousefi¹,

González‐Andújar²,

Mohammad-Alizadeh³

et al. 2012

Weed Research

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Yousefi AR, Gonzalez‐Andujar JL, Alizadeh H, Baghestani MA, Rahimian H & Karimmojeni H (2012). Interactions between reduced rate of imazethapyr and multiple weed species–soyabean interference in a semi‐arid environment. Weed Research.52, 242–251. Summary Field experiments were conducted to evaluate Xanthium strumarium and Amaranthus retroflexus competitive ability with soyabean under unsprayed and sprayed (half the recommended rate of imazethapyr) conditions. Weed density combinations of 0, 4, 8 or 12 plants m−1 of row for A. retroflexus and 0, 2, 4 or 8 plants m−1 of row for X. strumarium were established alone, and in all possible combinations. When X. strumarium and A. retroflexus were grown at the same density, X. strumarium contributed 60–69% of the total weed biomass depending on weed density. The half rate of imazethapyr reduced the biomass of both weed species by 90% as compared with untreated plots. Untreated A. retroflexus and X. strumarium reduced soyabean yields to 1911 kg and 1656 kg ha−1, respectively, while with the reduced rate of herbicide, the yield only decreased to 3612 kg and 3453 kg ha−1 respectively. The total weed density required to cause a 5% soyabean yield loss was 0.16 and 0.32 plants m−1 of row with no‐herbicide treatment, while with the half rate of imazethapyr, it increased up to 2.78 and 4.32 plants m−1 in 2007 and 2008 respectively. Owing to the higher competitive ability of X. strumarium, it should be given a greater priority for control than A. retroflexus in soyabean grown in a semi‐arid environment. The half rate of herbicide significantly decreased the competitive ability of X. strumarium and A. retroflexus indicating that, in soyabean, application of this rate might be more cost‐effective and more environment‐friendly than the recommended ones.

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Control of Amaranthus quitensis in soybean crops in Argentina : an alternative to reduce herbicide use

Cited by 14 publications

References 2 publications

First Report of Amaranthus hybridus with Multiple Resistance to 2,4-D, Dicamba, and Glyphosate

First Report of Amaranthus hybridus with Multiple Resistance to 2,4-D, Dicamba, and Glyphosate

Germination characteristics of Amaranthus quitensis as affected by seed production date and duration of burial

Interactions between reduced rate of imazethapyr and multiple weed species–soyabean interference in a semi‐arid environment

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