Modelos de pontos críticos para relacionar o rendimento de grãos de aveia branca com a intensidade de doença no patossistema múltiplo ferrugem da folha: helmintosporiose
Abstract:A ferrugem da folha e a helmintosporiose são as principais doenças fúngicas foliares de aveia branca. Em cultivares suscetíveis, o controle químico não considera o limiar de dano econômico (LDE). O objetivo deste trabalho foi obter funções de dano, por modelos de ponto crítico, ao relacionar o dano pela ocorrência simultânea da ferrugem da folha e a helmintosporiose com o rendimento de grãos nas safras de 2006 e 2007, em Lages, Santa Catarina (SC). O gradiente da intensidade das doenças foi gerado por número d… Show more
“…Considering the coefficients of determination, the variables incidence and severity showed good relationship with the data, while NERBASS JUNIOR et al (2010), had better relationship with the variable incidence in damage function equations for the culture of oats and AGOSTINETTO et al (2012) for variable severity in barley crop.…”
Section: Resultsmentioning
confidence: 87%
“…The equations were adjusted to a ton of rice grains, in order to facilitate its use in the calculation of EDT, according to simple pathossystem (REIS & CASA, 2007) and multiple pathossystem (BOHATCHUK et al, 2008) in wheat; simple pathossystem (REIS et al, 2008) and multiple in oat (NERBASS JUNIOR et al, 2010), and simple pathossystem (REIS et al, 2002) and multiple pathossystem in barley (AGOSTINETO et al, 2012).…”
Section: Resultsmentioning
confidence: 99%
“…According to REIS & CASA (2009), the complexity that involves the decision of apply fungicides, and the doubts about the probable damages of production leads to decisions that can be precipitated, resulting in unnecessary spending or delayed decisions resulting in unrecoverable losses. The EDT is characterized as scientific criteria for the use of fungicide on crops such as: some pathosystems in wheat (REIS & CASA, 2007;BOHATCHUCK et al, 2008) mildew and brown spot on barley (Reis et al, 2002;AGOSTINETO et al, 2012) and leaf rust in oat (NERBASS JUNIOR et al, 2010). Through EDT by using the critical point model is possible to identify a certain stage of development, in which the intensity of this disease is correlated with future damage (BERGAMIN FILHO & AMORIM, 1996).…”
Critical-point models to relate yield and disease intensity of the multiple pathosystem in rice leaf spots disease.Ciência Rural, v.46, n.1, jan, 2016. Critical-point models to relate yield and disease intensity of the multiple pathosystem in rice leaf spots disease tillering and 2012/2013 harvest resulted in R=13.404-92.98I and R=10.685-3.804S. Respectively in each harvest resulted in tillering (R=9.141-103.6I; R=7.605-1.538 and R=8.864-73.91I; R=7.202-77S), panicle initiation (R=9.432-188.5I; R=7.,038-1.466S and R=10.176-87.33I; R=8.258-533.55S), booting (R=7.044-71.78I; R=6.881-1.296S and R=9.993-71.74I; R=8.846-763.83S), flowering (R=7.447-82.29I; R=8.731-1.398S and R=8.347-54.36I; R=7.338-681.52S) de 2012de /2013 R=7.605-1.538 e R=8.864-73,91I; R=7.202-77S), iniciação da panícula (9.432-188,5I; R=7.038-1.466S e 10.176-87I; R=8.258-533,55S), emborrachamento (R=7.044-71,78I; 6.881-1.296S e R=9.993-71,74I; R=8.846-763,83S), floração (R=7.447-82,29I; R=8.731-1.398S e R=8.347-54,36I; R=7.338-681,52S) e grão leitoso (R=10.143-80,5I; R=7.522-1.402S e R=8.661-60.063I; R=9.754-1.465S). As funções geradas permitem obter o coeficiente de dano para uso no cálculo do LDE em patossistema múltiplo de manchas foliares, em arroz irrigado.
“…Considering the coefficients of determination, the variables incidence and severity showed good relationship with the data, while NERBASS JUNIOR et al (2010), had better relationship with the variable incidence in damage function equations for the culture of oats and AGOSTINETTO et al (2012) for variable severity in barley crop.…”
Section: Resultsmentioning
confidence: 87%
“…The equations were adjusted to a ton of rice grains, in order to facilitate its use in the calculation of EDT, according to simple pathossystem (REIS & CASA, 2007) and multiple pathossystem (BOHATCHUK et al, 2008) in wheat; simple pathossystem (REIS et al, 2008) and multiple in oat (NERBASS JUNIOR et al, 2010), and simple pathossystem (REIS et al, 2002) and multiple pathossystem in barley (AGOSTINETO et al, 2012).…”
Section: Resultsmentioning
confidence: 99%
“…According to REIS & CASA (2009), the complexity that involves the decision of apply fungicides, and the doubts about the probable damages of production leads to decisions that can be precipitated, resulting in unnecessary spending or delayed decisions resulting in unrecoverable losses. The EDT is characterized as scientific criteria for the use of fungicide on crops such as: some pathosystems in wheat (REIS & CASA, 2007;BOHATCHUCK et al, 2008) mildew and brown spot on barley (Reis et al, 2002;AGOSTINETO et al, 2012) and leaf rust in oat (NERBASS JUNIOR et al, 2010). Through EDT by using the critical point model is possible to identify a certain stage of development, in which the intensity of this disease is correlated with future damage (BERGAMIN FILHO & AMORIM, 1996).…”
Critical-point models to relate yield and disease intensity of the multiple pathosystem in rice leaf spots disease.Ciência Rural, v.46, n.1, jan, 2016. Critical-point models to relate yield and disease intensity of the multiple pathosystem in rice leaf spots disease tillering and 2012/2013 harvest resulted in R=13.404-92.98I and R=10.685-3.804S. Respectively in each harvest resulted in tillering (R=9.141-103.6I; R=7.605-1.538 and R=8.864-73.91I; R=7.202-77S), panicle initiation (R=9.432-188.5I; R=7.,038-1.466S and R=10.176-87.33I; R=8.258-533.55S), booting (R=7.044-71.78I; R=6.881-1.296S and R=9.993-71.74I; R=8.846-763.83S), flowering (R=7.447-82.29I; R=8.731-1.398S and R=8.347-54.36I; R=7.338-681.52S) de 2012de /2013 R=7.605-1.538 e R=8.864-73,91I; R=7.202-77S), iniciação da panícula (9.432-188,5I; R=7.038-1.466S e 10.176-87I; R=8.258-533,55S), emborrachamento (R=7.044-71,78I; 6.881-1.296S e R=9.993-71,74I; R=8.846-763,83S), floração (R=7.447-82,29I; R=8.731-1.398S e R=8.347-54,36I; R=7.338-681,52S) e grão leitoso (R=10.143-80,5I; R=7.522-1.402S e R=8.661-60.063I; R=9.754-1.465S). As funções geradas permitem obter o coeficiente de dano para uso no cálculo do LDE em patossistema múltiplo de manchas foliares, em arroz irrigado.
“…Each plot had an experimental unit area of 5.0x2.5m. To generate the disease gradients, strobilurin and triazol fungicide rates (one half and full recommended rates) and numbers of fungicides sprays (once, twice, third and fourth) were applied, according to REIS et al, (2000REIS et al, ( , 2002REIS et al, ( , 2008, BOHATCHUK et al (2008) andNERBASS et al (2010). The fungicide applications were performed at the plant GS 22 (Main shoot and 2 tillers), GS 31 (Swelling 1st node detectable), GS 39 (Flag leaf ligule just visible), GS 45 (Full-boot, boot above ligule of 2nd last leaf) and GS 56 (50% of spikes visible), according to the diagrammatic scale of ZADOKS et al (1974).…”
Barley (Hordeum vulgaris L.) is the second most important winter crop in Southern Brazil. The excessive rainfall in this region during the crop-growing season increases the frequency and intensity of foliar fungal diseases. The research aimed to determine the damage function equations (DFE 219.5 to 6,276.6 (2009) and 102.3 to 5,292.5kg ha -1 (2010)
RESUMO
A cevada (Hordeum vulgaris L.) é a segunda mais importante cultura de inverno no Sul do Brasil. Nessa região, o excesso de chuvas durante a estação de crescimento da cultura favorece o aumento na frequência e intensidade de doenças foliares. O trabalho objetivou determinar as equações de função de dano (EFD) para o patossistema múltiplo mancha-marrom e oídio da cevada pela relação entre rendimento de grãos e intensidade foliar das doenças em diferentes estádios fenológicos da cultivar de cevada 'BRS
“…Therefore, the high percentage of caryopsis, the high weight of hectoliter and the grain size have been increasingly required [6]- [8]. These characteristics are not always obtained due to climatic factors and the prevalence of fungal diseases [9] [10]. Among the diseases, leaf rust (Puccinia coronata C da.…”
The use of productive cultivars with adaptability and stability and less demanding to fungicide use are critical to the sustainability of production factors. The objective of this work was to determine the per se performance of white oat cultivars and parameters of adaptability and stability on yield and grain quality in the proposition of cultivars more responsive in reducing the use fungicide. The study was conducted in Augusto Pestana, RS, Brazil, between the years 2010 and 2013. The experimental design was randomized blocks with six replicates, three with and three without fungicide. The study evaluated 14 white oat cultivars for yield and industrial capability. The white oat cultivars FAEM 4 Carlasul and URS Corona indicate high grain yield with stability and general adaptability, independent of chemical control. The cultivar URS Corona shows together high yield and thousand grain weight and hectoliter with general adaptability and stability in the absence of fungicide. Although no stability has been detected in industrial yield without the use of fungicides, cultivars of URS Charrua, URS Corona and URS Taura show high means with general adaptability.
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