Intensidade do mal das folhas em plantas jovens e adultas de seis clones de seringueira na região do Vale do Ribeira: South American leaf blight intensity evaluated in six clones of young and adult rubber trees in the Vale do Ribeira region, São Paulo state, Brazil

Furtado, Edson Luiz; Menten, José Otávio Machado; Passos, José Raimundo de Souza

doi:10.1590/s1982-56762008000200007

Cited by 15 publications

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“…Tabela 3. Dados pluviométricos do satélite TRMM entre julho e outubro, em 2001, 2004, 2005e 2008. Rainfall data from the TRMM satellite between July and October, in 2001, 2004, 2005 Coordenadas Dados pluviométricos Ano (Graus sexagesimais) (mm) Latitude Longitude Jul Ago Set Out 2001 17º21'50"S 54º42'54"O 3,2 16,8 116,7 104,9 2004 17º21'50"S 54º42'54"O 26,8 0,9 13,9 137,5 2005 17º21'50"S 54º42'54"O 6,8 4,1 92,4 137,4 2008 17º21'50"S 54º42'54"O 1,8 43,7 36,1 285,7…”

Section: Methodsunclassified

“…O consumo mundial de borracha no segundo trimestre de 2017 foi de 3,17 milhões de toneladas. No Brasil, foi em torno de 265 mil toneladas neste mesmo período (ROSSMANN, 2017) Os hábitos fenológicos de desfolha e reenfolha natural da seringueira apresentam importância para o manejo do mal das folhas, principal problema fitossanitário da cultura (FURTADO, 2008;SAMBUGARO, 2007). A duração da desfolha, intensidade e velocidade da troca de folhas variam de espécie para espécie e de clone para clone (FURTADO, 1996).…”

Section: Introductionunclassified

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Comportamento Do Vigor Foliar Em Seringueira Em Diferentes Fenologias De Dossel

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Lessa

et al. 2018

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O vigor foliar da seringueira demonstra variação durante o ano, refletindo fases fenológicas que influenciam na produção de látex, além de períodos suscetíveis à doenças e pragas. Assim, objetivou-se avaliar o vigor foliar dos clones GT 1 e RRIM 600 em abril e; em agosto, setembro e outubro, no município de Itiquira – MT, com clima classificado como Aw. Foram avaliados os vigores dos clones GT 1 e RRIM 600 em abril e; em agosto, setembro e outubro, meses precedente a desfolha anual e posterior a reenfolha natural, respectivamente. O vigor foliar foi avaliado baseado no Índice de Vegetação por Diferença Normalizada (NDVI) de imagens do satélite Landsat 5, onde suas médias foram avaliadas pelo teste de Tukey a 5% de probabilidade, com Delineamento em Blocos Casualizados e dois tratamentos (clones). Na análise, os dois clones apresentaram NDVI em abril com vigor foliar médio, ocorrendo diferença nas médias de NDVI, com maior no RRIM 600. Entre agosto e outubro o vigor foi alto, sem diferença entre o NDVI médio destes clones. O clone GT 1 com idade superior aos 19 anos demonstrou mudança de fenologia foliar em abril. O clone RRIM 600, posterior aos 17 ou 18 anos, demonstrou início de mudança fenológica das folhas em abril.Palavras-chave: Hevea brasiliensis, índice de vegetação, desfolha natural, fenologia. BEHAVIOR OF THE FOLIAR VIGOR IN SERINGUEIRA IN DIFFERENT PHENOLOGICAL PERIODS ABSTRACT:The leaf vigor of the rubber tree shows variation during the year, reflecting phenological phases that influence the production of latex, in addition to periods susceptible to diseases and pests. Thus, the objective was to evaluate the foliar vigor of clones GT 1 and RRIM 600 in April and; in August, September and October, in the municipality of Itiquira – MT, with climate classified as Aw. The vigores of clones GT 1 and RRIM 600 were evaluated in April and; in August, September and October, months preceding the annual defoliation and subsequent to natural refoliation, respectively. The foliar vigor was evaluated based on the Normalized Difference Vegetation Index (NDVI), Landsat 5 satellite images where its averages were evaluated by Tukey test at 5% probability, with a randomized block design and two treatments (clones). In the analysis the two clones presented NDVI in April with average leaf vigor, occurring difference in NDVI means, with greater in RRIM 600. Between August and October the vigor was high, with no difference between the mean NDVI of these clones. Clone GT 1 older than 19 years showed a change of foliar phenology in April. The RRIM 600 clone, after the age of 17 or 18 years, it showed the beginning of phenological change of leaves in April.Keywords: Hevea brasiliensis, NDVI, natural defoliation, phenology.

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Section: Introductionunclassified

Comportamento Do Vigor Foliar Em Seringueira Em Diferentes Fenologias De Dossel

Filho

Filgueiras

Lessa

et al. 2018

NAT

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“…Long periods of relative humidity enhance the development of the disease as mentioned by Guyot et al (2010). This causes severe and consecutive defoliation, which entail a reduction in the latex production and eventually the death of the trees (Furtado et al, 2008;Guyot et al, 2010;Jaimes and Rojas, 2011;Rivano et al, 2012).…”

Section: Relation Between Total Solids and Climatic Variablesmentioning

confidence: 99%

Repeatability for yield total solids in a segregating population of rubber (Hevea brasiliensis) in Colombia

Monsalve¹,

Torres²,

Arboleda³

et al. 2018

Rev. Fac. Nac. Agron. Medellín

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Rubber (Hevea brasiliensis) is a specie of late yield performance. This makes breeding programs long-term and the decisions taken are based in the base population genetic parameters. The aim of this research was to determinate a genetic potential of a rubber segregating population through the use of repeatability as a parameter, in order to make decisions to start a breeding program, with the purpose of increasing the total solids. In addition, to describe the target population and to explore the relation between total solids yield and climate variables. This research was carried out in a segregating population with 3395 trees in 12,000 m 2 divided into nine plots located in the research center El Nus of Corpoica. Ten evaluations of total solids were recorded in the period between October 2014 and September 2016. The repeatability of total solids was determined from estimation of individual and temporal environments variance using the Bayesian approach. Descriptive statistics for the total solid mean were used per plot and the correlation between total solids and climate variables were obtained. The repeatability estimate value was among 0.64 and 0.66. The plots had a total solids variation coefficient among 64.76 and 86.51%. Total solids and cumulate photosynthetic active radiation had a direct correlation (0.25) for 15 and 30 days prior period, while mean relative humidity had an inverse correlation of -0.44 and -0.42 with total solid in the same periods. There is a good probability that for this population the total solid can be inherited in a high proportion.

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Dynamic analysis of resistance in Colombian elite Hevea brasiliensis genotypes as a breeding strategy for enhancing South American leaf blight management under disease non-escape conditions in the Amazon region

Galindo-Rodríguez,

Sterling,

Muñoz-Ramirez

et al. 2024

Eur J Plant Pathol

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South American Leaf Blight (SALB) is the primary limitation to the establishment of new rubber (Hevea brasiliensis) crops in Latin America. This study aimed to assess the temporal dynamics of resistance to SALB in 99 elite Colombian genotypes and the IAN 873 cultivar (control) of H. brasiliensis in small-scale clone trials conducted under conditions with a high disease prevalence in the northwestern Colombian Amazon. Resistance monitoring was carried out on a monthly basis and analyzed over five climatic periods. Three variables were recorded: attack severity (AT, ranging from 0 to 4), reaction type (TR, ranging from 1 to 6) and stromal density (ST, ranging from 0 to 4). The maximum scores for TR and ST were used to classify the level of resistance of the genotypes. Highly significant differences in the mean values of AT, TR and ST among the genotypes, across the periods, and in the interaction between genotype and period were found. Over time, an increase in symptoms (AT) and signs (TR and ST) of SALB was observed. During the rainy periods, SALB intensity was highest, resulting in a leaf area affected ranging from 16 to 30%. Eight genotypes showed partial resistance (PR) (TR < 5 and ST < 2), while 16 genotypes demonstrated complete resistance (CR) (TR < 3 and ST = 0), and 76 genotypes were highly susceptible (HS) (TR > 5 or ST > 2). The temporal analysis identified 23 Colombian superior genotypes with varying degrees of SALB resistance, which can be a valuable breeding resource for improving SALB management in the Colombian Amazon region.

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Intensidade do mal das folhas em plantas jovens e adultas de seis clones de seringueira na região do Vale do Ribeira: South American leaf blight intensity evaluated in six clones of young and adult rubber trees in the Vale do Ribeira region, São Paulo state, Brazil

Cited by 15 publications

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Comportamento Do Vigor Foliar Em Seringueira Em Diferentes Fenologias De Dossel

Comportamento Do Vigor Foliar Em Seringueira Em Diferentes Fenologias De Dossel

Repeatability for yield total solids in a segregating population of rubber (Hevea brasiliensis) in Colombia

Dynamic analysis of resistance in Colombian elite Hevea brasiliensis genotypes as a breeding strategy for enhancing South American leaf blight management under disease non-escape conditions in the Amazon region

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