Seletividade de herbicidas pós-emergentes na cultura da mandioca

Silva, D.V.; Santos, J.B.; Carvalho, Frédéric A.; Ferreira, E.A.; França, André Cabral; Fernandes, José Sebastião Cunha; Gandini, Elizzandra Marta Martins; Cunha, Viviane Cristina da

doi:10.1590/s0100-83582012000400018

Cited by 24 publications

(37 citation statements)

References 8 publications

(7 reference statements)

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“…Among these products we can cite S-metolachlor, which showed to be selective and can be included in the weeds management programs (Silva et al, 2009;Biffe et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Selectivity of clomazone and S-metolachlor applied after cassava pruning

et al. 2013

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-The objective of this work was to evaluate the selectivity of clomazone in two formulations and S-metolachlor applied on shoots of different sizes after pruning of 'Baianinha' cassava. The experiment was arranged in a randomized block design in a factorial 5 x 2 (5 treatments x 2 sizes of shoots after pruning -10 and 33 cm) with four replications. The herbicides evaluated were: clomazone (encapsulated suspension -900 g h -1 ), clomazone (encapsulated suspension -1,080 g ha -1 ), clomazone (emulsifiable concentrate 900 g ha -1 ), S-metolachlor (1,920 g ha -1 ) and an untreated control. During the experiment, all plots were kept free of weed interference by hand weeding. It was concluded that both the formulations of clomazone and S-metolachlor were selective when applied on both the shoot sizes evaluated. However, the application of S-metolachlor on 33 cm shoots gave higher selectivity to 'Baianinha' cassava plants. Keywords:Manihot esculenta, microencapsulated, weed, clomazone, S-metolachlor. RESUMO -Objetivou-se neste estudo avaliar a seletividade do clomazone em duas formulações e do S-metolachlor aplicados em diferentes tamanhos de brotos depois da poda da mandioca Baianinha. O delineamento experimental utilizado foi o de blocos ao acaso, em esquema fatorial 5 x 2 (5 tratamentos x 2 tamanhos de brotos após a poda -10 e 33 cm), com quatro repetições. Os herbicidas

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“…Among these products we can cite S-metolachlor, which showed to be selective and can be included in the weeds management programs (Silva et al, 2009;Biffe et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Selectivity of clomazone and S-metolachlor applied after cassava pruning

et al. 2013

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“…Parte da tolerância da mandioca as menores doses da mistura está relacionada com a insensibilidade enzimática da mandioca ao fluazifop-p-butil e com a metabolização do fomesafen, que chega em menor quantidade ao sítio de ação, provocando, desta forma, incremento dos valores destas variáveis. Esses resultados concordam com os observados por Silva et al (2012b), que relataram que o herbicida fluazifop-p-butil mostrouse promissor para aplicação em área total, uma vez que foi altamente seletivo para a cultura da mandioca.…”

Section: Resultsunclassified

“…Esses resultados indicam a possibilidade de aplicação, em pós-emergên-cia, do fluazifop-p-butil, em área total. Para o fomesafen, pesquisas de campo são necessárias, para avaliar se a intoxicação visual (Silva et al, 2011(Silva et al, , 2012b) e a fisioló-gica, observadas neste trabalho, causam efeitos negativos na produtividade da cultura.…”

Section: Resultsunclassified

Aspectos fisiológicos da mandioca após a aplicação dos herbicidas fluazifop-p-butil e fomesafen

et al. 2014

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Physiological responses of cassava to application of the herbicides fluazifop-p-butil and fomesafenSome herbicides can influence the water use efficiency by the direct negative effect on photosynthesis, transpiration and stomatal conductance, or indirect, by reduction of plant metabolic rate. Therefore, this study aimed to evaluate the influence of fluazifop-p-butil and fomesafen herbicides, alone and in mixture, on the characteristics associated with water use efficiency in cassava cultivars, seeking to select the most tolerant cultivar to these herbicides. The experiment was carried out in a greenhouse in a randomized block design with four repetitions. The factorial scheme 5x7 was Acredita-se que alguns herbicidas possam influenciar a eficiência do uso da água, pelo efeito negativo direto sobre fotossíntese, transpiração e condutância estomática ou, indiretamente, pela redução da taxa metabólica da planta. Diante disso, objetivou-se, neste trabalho, avaliar a influência dos herbicidas fluazifop-p-butil e fomesafen, isolados e em mistura, sobre as características associadas ao uso da água, por cultivares de mandioca, visando a selecionar aqueles mais tolerantes aos referidos herbicidas. Realizou-se experimento, em casa de vegetação no delineamento de blocos casualizados, com quatro repetições. Adotou-se arranjo fatorial em esquema 5x7, constituído pela combinação de cinco cultivares de mandioca: Cacau-UFV, Platina, Coqueiro, Coimbra e IAC-12, com quatro doses da mistura comercial dos herbicidas fomesafen + fluazifop-p-butil (0,5; 0,75; 1,0 e 1,5 L ha -1 ), além da dose comercial recomendada de cada princípio ativo isolado e uma testemunha sem herbicida. As características avaliadas foram: condutância estomática (gs), taxa de transpiração (E) e eficiência do uso da água (EUA). De maneira geral, a E, gs e EUA foram afetadas pela aplicação da mistura dos herbicidas. Os cultivares de mandioca apresentam diferentes níveis de sensibilidade ao fluazifop-p-butil + fomesafen, sendo que o cultivar Platina é o mais tolerante à aplicação da mistura. O fluazifop-p-butil mostrou-se seletivo para a cultura e o fomasafen causou efeitos negativos na fisiologia da mandioca.Palavras-chave: transpiração, condutância estomática, controle químico, Manihot esculenta. 179Aspectos fisiológicos da mandioca após a aplicação dos herbicidas fluazifop-p-butil e fomesafen Rev.

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“…Since cassava is a culture that has no great impact on the national productive scenario compared to cultures of greater expression, such as soybeans, maize and sugarcane, there is great interest from pesticide companies in registering their products for this culture (Silva et al, 2009). Moreover, there are few studies on weeds control methods involving selective herbicides for cassava cultivation, especially for use in crop preemergence.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, sulfentrazone emerges as an option for weed control in cassava crops because of the high efficiency and the fact that the mechanism of action (Protox) is different from the herbicides registered (El-Sharkawy, 2004;Silva et al, 2009;Scariot et al, 2013). However, sulfentrazone has shown low selectivity to cassava plants when grown in sandy soil (Oliveira Jr. et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Sulfentrazone Selectivity and Efficiency in Cassava Crops in Sandy and Clayey Soils

et al. 2015

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Recebido para publicação em 16.7.2015 ABSTRACT -Weeds have the potential to dramatically interfere in cassava cultivation, reducing its productive potential; however, there are few studies on the selective herbicides in this crop. Therefore, the objective was to evaluate in this work the selectivity and efficiency of sulfentrazone in cassava crops grown in sandy and clayey soils. Two experiments were carried out: The first one was carried out in sandy soil conditions in the conventional system; and the second one was carried out in clayey soil conditions in the no-tillage system. The experimental design was a randomized block with four replications. The treatments consisted in doses of 250, 500, 750 and 1,000 g ha -1 of sulfentrazone, and weeded and non-weeded controls. Sulfentrazone application in cassava crops has linearly reduced the production of roots in a proportion of 0.0153 and 0.0107 t ha -1 at each increment in grams of the active ingredient, respectively. It was concluded that sulfentrazone was not selective for cassava crops grown both in sandy and in clayey soil; however, it was highly effective in weed control in both soils.

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Seletividade de herbicidas pós-emergentes na cultura da mandioca

Cited by 24 publications

References 8 publications

Selectivity of clomazone and S-metolachlor applied after cassava pruning

Selectivity of clomazone and S-metolachlor applied after cassava pruning

Aspectos fisiológicos da mandioca após a aplicação dos herbicidas fluazifop-p-butil e fomesafen

Sulfentrazone Selectivity and Efficiency in Cassava Crops in Sandy and Clayey Soils

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