Growth and Development of Digitaria insularis Biotypes Susceptible and Resistant to Glyphosate

Pereira, G.R.; Costa, Nivan B. da; Moratelli, Gustavo; Rodrigues-Costa, A.C.P.

doi:10.1590/s0100-83582017350100025

Cited by 7 publications

(6 citation statements)

References 13 publications

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“…By the data presented, roots of biotypes resistant and susceptible were the organs which present higher matter accumulation in the plant, in the analyzed period. Biomass production data upon different parts in this work differ from those analyzed by Pereira et al (2017), where the susceptible plants accumulated more dry leaf mass, while the resistant ones accumulated more roots dry mass, and by Machado et al (2008), in which sourgrass leaves (without distinction of herbicide-resistant plants) were the main dry matter allocation site. Carvalho et al Days after emergence (DAE) ± (2013), in which leaves are the main organs accumulating dry mass in the first half of sourgrass life cycle (without distinction of herbicide-resistant plants), while stems become the most important ones in the second half, from 77 DAE on.…”

Section: Discussionmentioning

confidence: 61%

Dry Matter and Macronutrient Accumulation in Digitaria insularis Biotypes Susceptible and Resistant to Glyphosate

Cesarin¹,

Martins²,

Barroso³

et al. 2019

JAS

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Herbicide resistant is associated with morphological, physiological and metabolic alterations in weeds. These alterations may reflect changes in the nutritional status of resistant plants and their growth it can be inferred in greater adaptability and competitive ability of the resistant biotypes. Thus, the objective of this research was to determine the dry matter and macronutrient accumulation and distribution by glyphosate-resistant and susceptible plants of Digitaria insularis (sourgrass), growing under mineral nutrition standard conditions. The experimental design was completely randomized, with eleven treatments and four replicates. The treatments consisted of evaluation periods at 15, 30, 45, 60, 75, 90, 105, 120, 135, 150 and 165 days after emergence (DAE). The average time for maximum theoretical accumulation (PtMax) and for inflection points of dry mass and macronutrient were lower for susceptible (133 DAE; 99 DAE) than for resistant biotype (141 DAE; 105 DAE). However, considering the average time obtained by susceptible, dry mass (g) and macronutrients (mg) accumulation was always higher for resistant biotype. The decreasing sequence of nutrient accumulation was similar for both sourgrass biotypes: K, N, Ca, Mg, P and S.

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Section: Discussionmentioning

confidence: 61%

Dry Matter and Macronutrient Accumulation in Digitaria insularis Biotypes Susceptible and Resistant to Glyphosate

Cesarin¹,

Martins²,

Barroso³

et al. 2019

JAS

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“…As doses de herbicidas utilizadas pelos autores foram semelhantes às doses usadas neste trabalho, representando as doses mais usadas a campo, com exceção de atrazina que foi usada à dose de 2.500 g i.a.ha -1 e no presente trabalho à dose de 1.500 g i.a.ha -1 . Pereira et al (2017) estudaram o desenvolvimento inicial de diferentes biótipos de capim amargoso, resistente e suscetível a glifosato, e relataram diferenças no padrão de acúmulo de matéria seca nas raízes e parte aérea de plântulas. O maior acúmulo de reservas no sistema radicular predisporia as plantas a apresentar maior resistência a condições adversas, inclusive ao efeito de herbicidas residuais.…”

Section: Variáveisunclassified

Germinação De Sementes De Capim Amargoso (Digitaria Insularis) Na Presença De Herbicidas Residuais

Corrêa¹,

Santos²,

Júnior³

et al. 2019

Agrarian

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RESUMO O manejo de capim amargoso (Digitaria insularis L. Fedde) em áreas agrícolas do Brasil tem se mostrado, ultimamente, um desafio difícil para produtores e técnicos. Devido à competitividade desta planta daninha, o que dificulta seu controle em áreas de plantio direto, torna-se interessante a busca de informações sobre a eficiência de herbicidas que poderiam suprimir o banco de sementes do solo, dispersão de sementes viáveis e reinfestação das áreas manejadas. O objetivo deste trabalho foi avaliar o efeito de herbicidas residuais sobre os percentuais de sementes não germinadas, plântulas mortas e plântulas vivas de capim amargoso. Os herbicidas foram diluídos e aplicados em Gerbox ® com papel mata borrão contendo as sementes e as avaliações foram feitas aos 7, 14 e 21 dias após aplicação. Os herbicidas testados foram atrazina, diclosulam, flumioxazina, s-metolacloro e sulfentrazona. O herbicida sulfentrazona aumentou a incidência de sementes não germinadas. Diclosulam e flumioxazina reduziram o número de plântulas vivas de Digitaria insularis. PALAVRAS-CHAVE: Controle químico, plantas daninhas perenes, plantas invasoras.

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“…In Brazil, glyphosate-resistant sourgrass was first reported in 2008 in the state of Paraná (Heap, 2022). This led to several studies aiming to understand the dynamics of biotypes of the species, focusing on their biology or management (Martins et al, 2017;Pereira et al, 2017;Ferreira et al, 2018;Marochi et al, 2018;Silveira et al, 2018). In agricultural fields, treatments based on ACCase-inhibiting herbicides, such as clethodim and haloxyfop-p-methyl, became the most applied because they were considered effective for the control of adult glyphosate-resistant sourgrass plants when combined or not with other management strategies (Cassol et al, 2019;Mendes et al, 2020;Nunes et al, 2021;Raimondi et al, 2020;.…”

Section: Introductionmentioning

confidence: 99%

Chemical and cultural management strategies for glyphosate-resistant sourgrass in central Brazil

Correia

2023

Pesq. agropec. bras.

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The objective of this work was to evaluate different chemical treatments, associating herbicide combinations with the maintenance of forage species in the off-season, for the management of glyphosate-resistant sourgrass (Digitaria insularis) in a soybean crop. The experimental design was a randomized complete block in a 4×5 split-plot arrangement, with four replicates. The treatments consisted of: four combinations of the clethodim, glyphosate, haloxyfop-p-methyl, glufosinate ammonium, and s-metolachlor herbicides in the plots; green covers with the Massai, BRS Tamani, and BRS Zuri cultivars of Panicum maximum and with Urochloa ruziziensis, as well as fallow, in the subplots; and a control with the isolated application of glyphosate at the desiccation and post-emergence of the soybean crop infested with sourgrass and weeded. The herbicides tested before sowing and at post-emergence of soybean promoted a control above 90% of adult sourgrass plants until grain harvest. After harvest, there was a new emergence of sourgrass, mainly in the plots without green cover in the off-season. Overseeding soybean with forage species allowed of the establishment of these plants, which consequently interfered in sourgrass emergence and growth. The chemical treatments with herbicide combinations associated with the maintenance of forage species in the off-season are effective for the control of adult glyphosate-resistant sourgrass plants.

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Growth and Development of Digitaria insularis Biotypes Susceptible and Resistant to Glyphosate

Cited by 7 publications

References 13 publications

Dry Matter and Macronutrient Accumulation in Digitaria insularis Biotypes Susceptible and Resistant to Glyphosate

Dry Matter and Macronutrient Accumulation in Digitaria insularis Biotypes Susceptible and Resistant to Glyphosate

Germinação De Sementes De Capim Amargoso (Digitaria Insularis) Na Presença De Herbicidas Residuais

Chemical and cultural management strategies for glyphosate-resistant sourgrass in central Brazil

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