Dissipation of Diquat and Paraquat, and Effects on Aquatic Weeds and Fish

Yeo, R. R.

doi:10.2307/4041065

Cited by 47 publications

(23 citation statements)

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“…Cyanatryn, used in flowing water, is provided in the form of a slow-release granule. Breakdown of herbicides in water generally occurs after 2-11 days (Magee and Colmer 1959;Coats 1965;Frank and Comes 1967;Yeo 1967;Cope et al 1969;Way et al 1971;Ogg 1972), depending on bacteria present and sometimes light (Newbold 1975) .…”

Section: Response To Herbicides and Other Chemicalsmentioning

confidence: 99%

The biology of Canadian weeds. 124. Hydrocharis morsus-ranae L.

Catling¹,

Mitrow²,

Haber³

et al. 2003

Can. J. Plant Sci.

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Catling, P. M., Mitrow, G., Haber, E., Posluszny, U. and Charlton, W. A. 203. The biology of Canadian weeds. 124. Hydrocharis morsus-ranae L. Can. J. Plant Sci. 83: 1001-1016. European frog-bit (Hydrocharis morsus-ranae L.), a free-floating, stoloniferous aquatic, is native to Europe and parts of Asia and Africa. It was discovered in Canada in 1932 in Ottawa, but earlier introduction is possible. By 1955 its North American distribution extended from Ottawa to Montreal. By 1980 it had extended southwest to Lake Ontario and northeast to Quebec City. Recently it has spread throughout much of the central and southwestern parts of southern Ontario, and further into northern New York and Vermont and eastern Michigan. The maximum rate of spread has been 15.6 km yr -1 . Reproduction by seeds is rarely reported but vegetative reproduction is very important in spread and colonization. In the fall, turions separate from the plant, sinking to the bottom where they overwinter. In the spring, these turions grow into small floating rosettes. Extremely rapid stoloniferous growth during the summer months results in the formation of large masses of interlocking plants that diminish native submerged aquatic plant communities by reducing available light. It is also of importance in limiting water flow in irrigation systems and restricting water traffic, thereby hindering recreational activity. Management has been largely mechanical. Hydrocharis morsus-ranae is a food plant for several water birds, rodents, fish and insects.

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Section: Response To Herbicides and Other Chemicalsmentioning

confidence: 99%

The biology of Canadian weeds. 124. Hydrocharis morsus-ranae L.

Catling¹,

Mitrow²,

Haber³

et al. 2003

Can. J. Plant Sci.

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“…De forma geral, na literatura, os trabalhos de degradação de diquat necessitaram de períodos bem menores para atingir a meia-vida do produto ou a sua dissipação/degradação por completo, em comparação aos ora observados (Coats et al, 1964;Frank & Gomes, 1967;Yeo, 1967;Simsiman et al, 1976;Van Horn et al, 1974).…”

Section: Tabela 1 -Leituras Em Absorbância E Porcentagem De Degradaçãunclassified

“…Também Frank & Gomes (1967) encontraram degradação quase que total do diquat com 14 dias após a sua aplicação em campo. Já Yeo (1967) concluíram que, dependendo da dose e da qualidade de água , a dissipação de diquat em lagoas era de 4 a 12 dias e entre 4 e 13 dias, respectivamente.…”

Section: Introductionunclassified

Degradação de diquat em condições de caixa d'água com e sem plantas de egéria

et al. 2003

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RESUMO -Dentre as plantas daninhas aquáticas submersas, o gênero Egeria é considerado um dos mais importantes de ocorrência nos reservatórios da região centro-sul do Brasil, pois acarreta prejuízos à geração de energia, pesca, navegação e recreação. O presente trabalho teve como objetivo estudar, em condições de caixa d'água, a degradação do herbicida diquat, na presença e na ausência de plantas de Egeria densa e Egeria najas e no solo. O experimento foi instalado e conduzido no Núcleo de Pesquisas Avançadas em Matologia, do Departamento de Produção Vegetal da FCA/UNESP-Botucatu-SP. Utilizaram-se caixas de 330 litros de água, com uma camada de solo de 20 cm de altura + 5 cm de areia, no qual foram plantados 20 ramos de cada uma das espécies de egéria. Os tratamentos constituíram-se de aplicações de 6 ppm de diquat (Reward), utilizando-se os seguintes tipos de combinação: caixas d´água apenas com água; caixas d'água com água e solo; e caixas d'água com água, plantas e solo. As plantas foram coletadas no reservatório de Jupiá, localizado no município de Castilho-SP; elas se encontravam no estádio adulto de desenvolvimento e foram transportadas às caixas no mesmo dia de coleta. As determinações das concentrações de diquat foram mensuradas através de espectrofometria (308 nm), em que se obteve a seguinte curva: CONCENTRAÇÃO DO HERBICIDA (ppm)=0,7418+50,95391*A, sendo A= leitura de absorbância. Obteve-se um coeficiente de correlação de 0,9956648. Na condição de caixas com água + planta + solo, a meia-vida do diquat foi de 29 dias após a aplicação do herbicida. Utilizando caixas com água + solo, a meia-vida do diquat foi de 23 dias após a aplicação do herbicida. Em se tratando de caixas contendo apenas água, a meia-vida do diquat foi de 18 dias após a aplicação do herbicida.Palavras-chave: planta aquática, meia-vida, herbicida. ABSTRACT -Egeria is considered to be the most important aquatic weed in Brazilian reservoirs since it causes great damage to navigation, fishing and power generation. The objective of this work was to study diquat degradation under small-tank conditions with and without

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“…This does not mean that pH has no effect on the properties of diquat. For example, diquat is more effective in controlling duckweed at pH 4 to 6 than at pH 8 to 10 (Guse, 1961 in Yeo, 1967). Also, diquat is more toxic to bluegills, fathead minnows and grass carp at lower pH than at higher pH (Surber and Pickering, 1962, El-Deen &Rogers, 1992 and Toobey et al, 1980).…”

Section: Physical and Chemical Factorsmentioning

confidence: 99%

“…For this riverine environment, the bottom of the river was assumed to be sandy and the suspended sediment had a concentration of 1.0 mg/L. Yeo (1967) found that treatment of reservoirs in California with diquat at concentrations varying from 0.125 to 1.0 ppm could produce water concentrations of diquat that varied considerably. Furthermore, this dissipation appeared to be controlled by turbidity and aquatic plant density with little impact from hardness, pH or temperature.…”

Section: Half-life and Disappearance Timementioning

confidence: 99%

Effects of Aquatic Herbicides and Housing Density on Abundance of Pond-Breeding Frogs

Picone

2015

Northeastern Naturalist

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Dissipation of Diquat and Paraquat, and Effects on Aquatic Weeds and Fish

Cited by 47 publications

References 0 publications

The biology of Canadian weeds. 124. Hydrocharis morsus-ranae L.

The biology of Canadian weeds. 124. Hydrocharis morsus-ranae L.

Degradação de diquat em condições de caixa d'água com e sem plantas de egéria

Effects of Aquatic Herbicides and Housing Density on Abundance of Pond-Breeding Frogs

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