EFFECTIVENESS OF DIQUAT, BOTH ISOLATED AND ASSOCIATED WITH COPPER SOURCES IN CONTROLLING THE Hydrilla verticillata SUBMERGED MACROPHYTES AND ANKISTRODESMUS Gracilis microphyte

Malaspina, Igor Cruz; Cruz, Claudinei da; Garlich, Nathália; Bianco, S.; Pitelli, Robinson Antônio

doi:10.1590/s0100-83582017350100018

Cited by 6 publications

(8 citation statements)

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“…Em condição de laboratório, a utilização de imazamox até 10,0 mg L -1 causou redução da biomassa (y = -7,1306x + 97,158), com coeficiente de determinação de R 2 = 0,73 e do comprimento (y = -7,1556x + 93,929, R 2 = 0,80) dos fragmentos apicais de C. demersum em aproximadamente 50% após exposição de 30 dias (Figura 1). Com a utilização de imazamox + 0,1% de hidróxido de cobre ocorreu redução de 100% da biomassa (y = -17,679 + 111,61, com R 2 = 0,87) e do comprimento (y = -18,699 + 116,37, com R 2 = 0,92) da macrófita a partir de 2,5 mg L -1 (Figura 1), similar a utilização de 0,1 a 1,8 mg L -1 de diquat isolado e em mistura com 1,0% de hidróxido e oxicloreto de cobre que controlou 100% de H. verticillata (MALASPINA et al, 2017), assim, o emprego da mistura foi mais eficaz no controle de C. demersum. Figura 1.…”

Section: Resultsunclassified

“…Estudos sobre a eficácia de controle de macrófitas submersas foram realizados com o diquat em Hydrilla verticilata, Egeria densa e E. najas (HENARES et al, 2011); com diquat, hidróxido de cobre, oxicloreto de cobre e suas associações (diquat + 0,1% de oxicloreto de cobre e diquat + 0,1% de hidróxido de cobre) para o controle de Cerathophyllum demersum (GARLICH et al, 2016); diquat isolado e em mistura com hidróxido e oxicloreto para o controle de Hydrilla verticillata e da alga Ankistrodesmus gracilis (MALASPINA et al, 2017); e com endothall para controle de Vallisneria australis, Potamogeton sulcatus, Elodea canadensis, Sagittaria platyphylla e Myriophyllum papillosum) (CLEMENTS et al, 2018), dentre outros.…”

Section: Introductionunclassified

“…Um dos possíveis problemas após o controle de intensas infestações de macrófitas é a liberação de nutrientes inorgânicos como nitrogênio e fósforo no ambiente aquático, favorecendo o processo de eutrofização (GRUBER; GALLOWAY, 2008), o que pode contribuir para a reprodução e proliferação de algas (VIDOTTI;ROLLEMBERG, 2004;MALASPINA et al, 2017). Com o aumento de algas ocorre a diminuição do oxigênio dissolvido na água o que pode acarretar a mortalidade de peixes, liberação de toxinas secretadas por algumas espécies de cianobactérias.…”

Section: Introductionunclassified

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Eficácia Da Mistura De Algicida Com Herbicidas Em Macrófitas E Controle Secundário De Algas

Cruz

Silva²,

Garlich³

et al. 2019

RBHerbicidas

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Os objetivos deste estudo foram determinar a eficácia de controle dos herbicidas imazamox e saflufenacil, isolados e em mistura com hidróxido de cobre (fonte de íon cobre) no controle da macrófita (Ceratophyllum demersum) e determinar a eficácia de controle de alga unicelular (Ankistrodesmus gracilis) e filamentosa (Pitophora kewensis) das misturas imazamox + 0,1% de cobre e saflufenacil + 0,1% de cobre, em condição de laboratório. Para o controle de C. demersum, os experimentos foram instalados com as concentrações de 0,01; 0,1; 1,0; 2,5; 5,0; e 10,0 mg L-1 imazamox e saflufenacil isolados ou acrescido de 0,1% de fonte cobre. Para os experimentos com alga unicelular (70 mL da água coletada) e alga filamentosa (1,0g) foi utilizado a concentrações 0,01; 0,1; 1,0; 2,5; 5,0; e 10,0 mg L-1 imazamox e saflufenacil acrescidos de 0,1% de cobre. Após o término do experimento foi determinado à concentração de clorofila a e feofitina a presentes nas amostras. Com a utilização de imazamox + 0,1% de cobre ocorreu redução de 100% do peso e do comprimento da macrófita a partir de 2,5 mg L-1. Com o saflufenacil + 0,1% de cobre ocorreu 100% de mortalidade das plantas em 1,0 mg L-1. As misturas testadas também foram eficazes na redução da atividade fotossintética de algas unicelulares e filamentosas. A aplicação dos herbicidas imazamox e saflufenacil acrescidos de 0,1% de hidróxido de cobre apresenta sinergismo no controle de macrófitas submersas e pode apresentar efeito secundário algicida.

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Section: Resultsunclassified

Section: Introductionunclassified

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Eficácia Da Mistura De Algicida Com Herbicidas Em Macrófitas E Controle Secundário De Algas

Cruz

Silva²,

Garlich³

et al. 2019

RBHerbicidas

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“…Up to a certain limit, the development of aquatic vegetation can be considered harmful in several ecosystems (Malaspina et al, 2017). In order to reduce the environmental, social and economic impacts of hydrophytic plants, mechanical and biological control have been used (Pitelli et al, 2008;Diao et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Potential of Colletotrichum typhae H.C Greene mycoherbicide for bio-control of Southern cattail (Typha domingensis Pers.) plants

et al. 2020

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The anthropic interference in aquatic ecosystems favors the disordered colonization of T. domingensis, damaging the production of hydroelectric power and river traffic. Because of this, studies report the efficacy of fungal mycoherbicides, with control rates reaching as high as 90%. Thus, the objective of this study was to evaluate the potential of C. typhae as a mycoherbicide in bio control of T. domingensis, at in vitro and greenhouse conditions. 107 samples of symptomatic T. domingensis leaves were collected in flooded areas of rivers in Brazil, with identification and isolation of the collected fungal species. The concentration of inoculum was determined to evaluate the incidence and severity of the disease, the influence of temperature on mycelial growth and conidia germination, the effect of temperature and leaf wetness period on T. domingensis infection by C. typhae and the host range test in vitro. The growth of the colonies of C. typhae was higher at 25 to 30 ºC. There was no interference of the photoperiod on germination of the spores, but the highest percentage of germination was occurred at 20 ºC. The influence of environmental conditions on infection of inoculated leaves of T. dominguensis revealed that at 15 ºC and the period of leaf wetness of 48 hours the highest incidence of the disease was observed, as well as the severity for the same period of leaf wetness. The specificity test showed that C. typhae is specifically pathogenic to T. domingensis. This the first report of the occurrence of this pathogen in aquatic macrophytes of this species and in T. domingensis, a potential mycoherbicide for the control of this aquatic weed.

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“…Up to a certain limit, the development of aquatic vegetation can be considered harmful in several ecosystems [7]. In order to reduce the environmental, social and economic impacts caused by hydrophytic plants, mechanical and biological control have been used [8,9].…”

Section: Introductionmentioning

confidence: 99%

Biological Potencial of Colletotrichum typhae H.C Greene mycoherbicide for Typha domingensis Pers

Maia

Melo

Barreto

et al. 2018

Preprint

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24 The anthropic interference in aquatic ecosystems, favors the disordered colonization of T. domingensis, 25 damaging the production of hydroelectric power and river traffic. Thus, the objective of this study was 26 to evaluate the potential of C. typhae as a mycoherbicide in the control of T. domingensis, in vitro and 27 in greenhouse. 107 samples of symptomatic T. domingensis leaves were collected in flooded areas of 28 rivers in Brazil, with identification and isolation of the collected fungal species. The concentration of 29 inoculum was determined to evaluate the incidence and severity of the disease, the influence of 30 temperature on mycelial growth and conidia germination, the effect of temperature and leaf wetness 31 period on T. domingensis infection by C. typhae and the host range test. The growth of the colonies of 32 C. typhae was higher at 25 to 30 ºC, there was no interference of the photoperiod on germination of the 33 spores, but the highest percentage of germination occurred at 17.39 ºC. The influence of environmental 2 34 conditions on infection of inoculated leaves of T. dominguensis indicated that at 15 ºC and the period of 35 leaf wetness of 48 hours promoted the highest incidence of the disease, as well as the severity for the 36 same period of leaf wetness. The specificity test showed that C. typhae is specific and pathogenic to T. 37 domingensis. Being this the first report of the occurrence of this pathogen in aquatic macrophytes of 38 this species and in T. domingensis in Brazil. 39 Keywords: Biological control; Aquatic macrophytes, Leaf wetness 40 41 Introduction 42 Typha domingensis Pers. is an invasive macrophyte found in the Americas, Europe, Africa, Asia and 43 Oceania, being considered as a native species of South America, occurring throughout Brazil [1]. It is 44 propagated either by seeds or vegetatively, by rhizomes, with vigorous growth by the decomposition 45 and assimilation of organic matter as a source of nutrients, reaching about seven tons of rhizomes per 46 hectare [2]. Thus, T. domingensis is used as a biological filter for urban sewage, industrial effluents rich 47 in heavy metals and erosion control in drainage channels and reservoir banks [3]. 48However, anthropic interference in aquatic ecosystems favors the colonization of T. domingensis, 49 which may hinder the production of hydroelectric power, river traffic and agricultural irrigation [4]. In 50 the United States, this macrophyte accounts for the degradation of almost 12.000 ha -1 of Florida 51 marshes, due its aggressive growth in response to eutrophication by nitrates and phosphates from 52 agricultural and urban waste and frequent fires [5]. In Brazil, it is estimated that the intense growth of 53 T. domingensis in reservoirs of the country's hydroelectric dams extends to about 300 ha -1 in the water 54 mirror. These changes contribute to the reduction of water quality and biodiversity patterns in 55 environments colonized by this species [6]. 56Up to a certain limit, the development of aquatic vegetation c...

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EFFECTIVENESS OF DIQUAT, BOTH ISOLATED AND ASSOCIATED WITH COPPER SOURCES IN CONTROLLING THE Hydrilla verticillata SUBMERGED MACROPHYTES AND ANKISTRODESMUS Gracilis microphyte

Cited by 6 publications

References 27 publications

Eficácia Da Mistura De Algicida Com Herbicidas Em Macrófitas E Controle Secundário De Algas

Eficácia Da Mistura De Algicida Com Herbicidas Em Macrófitas E Controle Secundário De Algas

Potential of Colletotrichum typhae H.C Greene mycoherbicide for bio-control of Southern cattail (Typha domingensis Pers.) plants

Biological Potencial of Colletotrichum typhae H.C Greene mycoherbicide for Typha domingensis Pers

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