A general joint action model for herbicide mixtures

Streibig, J. C.; Kudsk, Per; Jensen, Jens Erik

doi:10.1002/(sici)1096-9063(199805)53:1<21::aid-ps748>3.3.co;2-c

Cited by 11 publications

(20 citation statements)

References 6 publications

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“…The parameter GR 50 is the dose producing a response halfway between the upper limit, d (fixed at 100), and the lower limit (fixed at 0), c. The parameter b denotes the relative slope around GR 50 [19].…”

Section: Dose Response Assaysmentioning

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: Dose Response Assaysmentioning

confidence: 99%

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

et al. 2018

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“…Em trabalho com associação de mecoprop-P e tribenuron-methyl sobre Veronica persica foi também observada redução dos I 50 para a variável MF, com o incremento da proporção de tribenuron-methyl na associação (Streibig et al, 1998).…”

Section: Resultsunclassified

“…Várias metodologias foram propostas e empregadas para a definição de qual tipo de interação ocorre em uma determinada associação. Na última década, tem sobressaído a proposta do uso de curvas de resposta às doses dos herbicidas e de isobologramas para a definição do tipo de interação (Gowing, 1960;Hatzios & Penner, 1985;Green & Bailey, 1987;Gressel, 1990;Streibig et al, 1998Streibig et al, , 1999.…”

Section: Introductionunclassified

“…A posição relativa desses pontos pode ser mais bem avaliada com a representação dos intervalos de confiança entre os I 50 obtidos. Assim, em torno da isobole de aditividade forma-se uma faixa de confiança e, em torno dos I 50 das associações, intervalos de confiança, exprimindo a amplitude de variação da dose estimada (Tammes, 1964;Morse, 1978;Drury, 1980;Campbell et al, 1981;Green & Bailey, 1987;Streibig, 1987;Green & Streibig, 1993;Gessner, 1995;Streibig et al, 1998).…”

Section: Introductionunclassified

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Curvas de resposta e isobolograma como forma de descrever a associação de herbicidas inibidores do fotossistema II e da síntese de carotenóides

Kruse¹,

Vidal

Trezzi

2006

Planta daninha

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RESUMO -A metodologia de curvas de resposta e isobologramas, feitos a partir dos I 50 gerados pelas curvas, tem sido bastante apregoada na comprovação de sinergismo. O experimento foi conduzido em casa de vegetação, com girassol cultivado em solução nutritiva (Hoagland), aplicando-se na solução 27 tratamentos, com os herbicidas metribuzin nas doses de 0, 70, 140, 280, 560 e 1.130 nM e clomazone nas doses de 0, 40, 80, 160, 320 e 640 mM. Combinaram-se as doses dos herbicidas de maneira a produzir os I 50 das seis curvas resultantes das associações. Nas plantas coletadas, cinco dias após a aplicação, determinou-se o percentual de dano, a massa fresca e a massa seca das plantas de girassol. Os seis pontos de I 50 de cada variável foram utilizados para formar isobologramas, onde os I 50 dos herbicidas aplicados isolados, unidos por uma reta, formaram a isobole de aditividade. Em torno desta, foram traçadas faixas de confiança, a partir do produto dos intervalos de confiança dos I 50 dos herbicidas isolados, dentro das quais se posicionaram os I 50 resultantes das associações. Todas as associações situaram-se na região de sinergismo, abaixo da isobole de aditividade, embora com diferentes probabilidades. Na variável massa seca, a associação das doses de clomazone com 140 nM de metribuzin demonstrou probabilidade de, em torno de 90%, ser uma interação sinérgica.Palavras-chave: mistura de herbicidas, sinergismo, metribuzin, clomazone. (Hoagland), applying in solution 27 treatments, with the herbicides metribuzin, at the rates of 0, 70, 140, 280, 560 and 1,130 nM and clomazone, at the rates of 0, 40, 80, 160, 320 and 640 ABSTRACT -The Dose-Response Curve and Isobolograms methodology, based on the I 50 generated by curves has been largely recommended to demonstrate synergism. The experiment was conducted in a greenhouse, with sunflower cultivated in nutrient solution

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“…In parallel, research has also been carried to establish more adequate and more rigorous bioassays and methods to investigate seed germination responses to allelopathins, namely in relation to the dependency of functional availability of phytochemicals on seed density [19,20], biologically meaningful parameterization of seed germination or growth over time [21,22] and the relevance of seed morphology including seed volume on seeds responses to allelopathic compounds [23].…”

Section: Introductionmentioning

confidence: 99%

Persistent and Transient Inhibition of Seed Germination by Fractions of Methanol-Water Extract of Wheat Straw

Dias

2014

ARRB

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The objectives of this work were to investigate the effects of wheat straw constituents on total seed germination and on time needed for seed germination to start and to assess the usefulness of evaluating the recovery of germination to help guide the screening for a sequential search of bioactive natural phytochemicals. Dose-response bioassays of lettuce seed germination to increasing concentrations of six fractions of methanol-water extract were conducted and whenever inhibition of germination exceeded 90% non-germinated seeds were transferred to distilled water and recovery of germination investigated. Only the fractions essentially composed by neutral polar compounds and by acids failed to inhibit total germination. Fractions composed by strong acids, basic compounds and fatty acids plus steroids completely inhibited total germination at 5mg mL −1 , the former also inhibiting germination by more than 90% at 1mg mL −1 . In these three fractions the concentration necessary for 100% inhibition was estimated to range between 4.1 mg mL −1 and 4.4mg mL −1 . Time needed for germination to start was always significantly increased even by fractions that failed to affect total germination. Basic compounds were the most effective in delaying the start of germination increasing it more than 4-fold at 2mg mL −1 from 1.0 to 4.3 days. When non-germinated seeds were transferred to distilled water persistence of complete inhibition was only found with strong acids, almost full persistence with basic compounds. Thus the consideration of recovery of germination makes possible a more informed choice of the fraction to select for further bioassay guided search for phytochemical with herbicide activity. The fraction is the one composed by strong acids, Original Research ArticleAnnual Research &Review in Biology, 4(24): 3993-4003, 2014 3994 mainly phenolic acids, all of them identified, provided that persistent seed inhibition is desired and long term weed control through depletion of weed seed banks in soil is aimed.

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A general joint action model for herbicide mixtures

Cited by 11 publications

References 6 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

Curvas de resposta e isobolograma como forma de descrever a associação de herbicidas inibidores do fotossistema II e da síntese de carotenóides

Persistent and Transient Inhibition of Seed Germination by Fractions of Methanol-Water Extract of Wheat Straw

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