Aplicação aérea e terrestre de fungicida para o controle de doenças do milho

Cunha, João Paulo Arantes Rodrigues da; Silva, Leandro Luiz da; Boller, Walter; Rodrigues, Jaqueline Fátima

doi:10.1590/s1806-66902010000300007

Cited by 19 publications

(17 citation statements)

References 9 publications

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“…There is evidence that the use of fungicide in maize culture enables the reduction in the percentage of grain rot; according to Juliatti et al (2007), the foliar application of triazole and strobilurinfungicides (Pyraclostrobin + Epoxiconazole, Azoxystrobin + Cyproconazole and Azoxystrobin) resulted in a lower percentage of grain rot. In recent years, research has shown the effectiveness of fungicide application in the management of foliar diseases and in reducing the damage caused by them to productivity (Cunha, Silva, Boller, & Rodrigues, 2010).…”

Section: Methodsmentioning

confidence: 99%

<b>Effect of foliar fungicide and plant spacing on the expression of lipoxygenase enzyme and grain rot in maize hybrids

et al. 2017

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ABSTRACT. This study was carried out with the objective of evaluating the effect of fungicide application on grain rot in commercial maize hybrids and the relation between grain rot and the expression of lipoxygenase enzyme in grain in conventional row spacing of 0.70 m and reduced row spacing of 0.45 m. Treatments were made in a 3 x 8 factorial scheme, using three forms of management with fungicide (Trifloxystrobin + Prothioconazole) and eight maize hybrids divided into two groups (tolerant and susceptible) with three repetitions, totaling 72 plots in each environment (conventional and reduced spacing) in the 2013/2014 crop. The following characteristics were evaluated: grain rot percentage and lipoxygenase enzyme expression (LOX) in the grain. The hybrid and the fungicide utilized influenced the grain rot percentage. Grain rot percentage was reduced by the use of the fungicide, and the highest reduction was in susceptible hybrids with two applications, V8 and V8+VT. There was higher expression of LOX enzyme in maize hybrids that belong to the group tolerant of fungi that cause grain rot .The use of the fungicide in two applications, V8 (eight leaves) and VT (tasseling), increased the intensity of the LOX enzyme, which was more evident for the reduced spacing. Efeito de fungicida foliar e espaçamento de plantas na expressão da enzima lipoxigenase e podridão de grãos em híbridos de milho RESUMO. O objetivo deste trabalho foi avaliar o efeito da aplicação de fungicida sobre a podridão de grãos em híbridos comerciais de milho e a relação entre os grãos ardidos e a expressão da enzima lipoxigenase no grão, em espaçamento convencional de 0,70 m e reduzido de 0,45 m. Os tratamentos foram no esquema fatorial 3 x 8, com três formas de manejo com fungicida (Trifloxistrobina + Protioconazol) e oito híbridos de milho, sendo divididos em dois grupos (tolerantes e suscetíveis), com três repetições, totalizando 72 parcelas em cada ambiente (espaçamento convencional e reduzido), na safra agrícola 2013/2014. As seguintes caractrísticas foram avaliadas: porcentagem de grãos ardidos e expressão da enzima lipoxigenase (LOX) nos grãos. O fungicida reduziu a incidência de grãos ardidos, e a maior redução ocorreu nos híbridos suscetíveis, com duas aplicações, V8 e V8+VT. Houve maior expressão da enzima LOX em híbridos de milho pertencentes ao grupo tolerante aos fungos causadores de grãos ardidos. A aplicação do fungicida em duas aplicações, V8 (oito folhas) e VT (pendoamento), aumentou a intensidade da enzima LOX, mais evidente no espaçamento reduzido.Palavras-chave: LOX, podridão de espigas, controle químico, espaçamento reduzido, Zea mays.

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Section: Methodsmentioning

confidence: 99%

<b>Effect of foliar fungicide and plant spacing on the expression of lipoxygenase enzyme and grain rot in maize hybrids

et al. 2017

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“…Entretanto, a produção de grãos por unidade de área ainda não traduz o potencial genético das cultivares disponíveis, levando a constantes buscas por alternativas que aumentem a produtividade (CUNHA et al, 2010).…”

Section: Introductionunclassified

Divergência genética em genótipos de milho, no estado do Tocantins

Rotili¹,

Cancellier²,

Dotto³

et al. 2012

Rev. Ciênc. Agron.

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RESUMO -Este trabalho objetivou avaliar a divergência genética em genótipos de milho no sul do estado do Tocantins. O experimento foi realizado no município de Gurupi -TO. As populações foram obtidas de 70 híbridos top cross pelo cruzamento de linhagens S 6 com um testador, utilizando-se 11 cultivares como testemunha, totalizando 81 genótipos. O delineamento experimental utilizado foi blocos casualizados com duas repetições. As características avaliadas foram: altura da planta, altura da espiga, prolificidade, comprimento de espiga, diâmetro de espiga, peso de 100 grãos, peso hectolítrico e produtividade de grãos. A divergência genética foi avaliada por procedimentos multivariados como a distância generalizada de Mahalanobis e pelos métodos de agrupamento de otimização de Tocher e vizinho mais próximo. Encontrou-se divergência genética entre as populações estudadas promovendo a formação de grupos diferentes entre o método de Tocher e do vizinho mais próximo. As características produtividade e comprimento de espiga foram as que mais e menos, respectivamente, contribuíram na diversidade genética dos genótipos. Palavras-chave: Zea mays. Plantas-melhoramento genético. Análise multivariada.ABSTRACT -This study aimed to evaluate the genetic diversity in maize genotypes in the southern of Tocantins. The experiment was conducted at Gurupi -TO, Brazil. The populations were obtained from 70 top cross, with crossing the lineages S 6 with a tester, and using 11 cultivars as a witness, totaling 81 genotypes. The experimental design was randomized blocks with two replications. The characteristics assessed were: plant height, ear height, prolificacy, ear length, ear diameter, weight of 100 grains, hectoliter weight and grain yield. Genetic divergence was assessed by multivariate procedures: Mahalanobis distance, clustering methods of Tocher and nearest neighbor. It was found genetic divergence among populations and the formation of non congruent groups between the method of Tocher and nearest neighbor. The yield grain was the major contributor to the genetic diversity and the ear length was the least.

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“…The One of the major challenges facing modern agriculture is to lower the amount of chemical pesticides applied per unit of land without compromising their efficacy (Tsai et al, 2005;Nuyttens et al, 2006;Cunha et al, 2010). Brachiaria plantaginea L., also known as alexandergrass, is a very common weed in both annual and perennial crops in Brazil and particularly serious in annual crops such as soybean and maize against which the weed is particularly competitive (Brighenti & Oliveira, 2011), leading to substantial reduction in their yield (Dias et al, 2010;Pereira et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Irradiated Glyphosate Against Brachiaria plantaginea L.

Machi¹,

Ferrari²,

Arthur³

2018

JAS

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Glyphosate irradiated with cobalt-60 type Gammacell 220 at different rates was sprayed on seedlings of Brachiaria plantaginea L., a common weed, grown in pots (one seedling with 3-4 leaves in each pot), at different concentrations equivalent to 1 L h -1 or 3 L h . It is important to know that gamma radiation in glyphosate herbicide can be used without antagonistic interactions without cause resistance.

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Aplicação aérea e terrestre de fungicida para o controle de doenças do milho

Cited by 19 publications

References 9 publications

<b>Effect of foliar fungicide and plant spacing on the expression of lipoxygenase enzyme and grain rot in maize hybrids

<b>Effect of foliar fungicide and plant spacing on the expression of lipoxygenase enzyme and grain rot in maize hybrids

Divergência genética em genótipos de milho, no estado do Tocantins

Efficacy of Irradiated Glyphosate Against Brachiaria plantaginea L.

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