Doenças com período de incubação variável em função da fenologia do hospedeiro

Filho, Armando Bergamin; Amorim, Lílian

doi:10.1590/s0100-41582002000600001

Cited by 26 publications

(13 citation statements)

References 6 publications

(6 reference statements)

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“…Therefore, the interaction between plant and pathogen was compatible (Bergamin Filho and Amorim, 2002). From the scoring scale, the results showed that all P 1 parent plants reached an incidence of 100%, i.e., all plants were susceptible ( Figure 4A).…”

Section: Resultsmentioning

confidence: 95%

Inheritance of bacterial spot resistance in Capsicum annuum var. annuum

Silva¹,

Rodrigues²,

Pimenta³

et al. 2017

Genet. Mol. Res.

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ABSTRACT. Since 2008, Brazil is the largest consumer of agrochemicals, which increases production costs and risks of agricultural products, environment, and farmers' contamination. Sweet pepper, which is one of the main consumed vegetables in the country, is on top of the list of the most sprayed crops. The bacterial spot, caused by Xanthomonas spp, is one of the most damaging diseases of pepper crops. Genetic resistant consists of a suitable way of disease control, but development of durable resistant cultivars as well as understanding of plant-bacterium interaction is being a challenge for plant breeders and pathologists worldwide. Inheritance of disease resistance is often variable, depending on genetic background of the parents. The knowledge of the genetic base controlling such resistance is the first step in a breeding program aiming to develop new genotypes, bringing together resistance and other superior agronomic traits. This study reports the genetic basis of bacterial spot resistance in Capsicum annuum var. annuum using mean generation analysis from crosses between accessions UENF 2285 (susceptible) and UENF 1381 (resistant). The plants of each generation were grown in a greenhouse and leaflets were inoculated with bacterial strain ENA 4135 at 10 5 CFU/mL in 1.0 cm 2 of the mesophyll. Evaluations were performed using a scoring scale whose grades ranged from 1.0 (resistant) to 5.0 (susceptible), depending on symptom manifestation. Genetic control of bacterial spot has a quantitative aspect, with higher additive effect. The quantitative analysis showed that five genes were the minimum number controlling bacterial spot resistance. Additive effect was higher (6.06) than dominant (3.31) and explained 86.36% of total variation.

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Section: Resultsmentioning

confidence: 95%

Inheritance of bacterial spot resistance in Capsicum annuum var. annuum

Silva¹,

Rodrigues²,

Pimenta³

et al. 2017

Genet. Mol. Res.

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“…Monomolecular models are usually fitted to disease progress data of monocyclic diseases, in which disease progress is a function of initial inoculum (Madden et al, 2007). However, the monomolecular model has also a good fit for diseases of relatively long and variable incubation period, typical of those of quiescent infections (Bergamin Filho & Amorim, 2002). In the case of SBFS, incubation periods longer than 50 days have been reported in Brazil (Spolti et al, 2011b) and Germany (Mayr et al, 2010), which may explain why monomolecular model described SBFS progress better than other models.…”

Section: Resultsmentioning

confidence: 99%

Sooty blotch and flyspeck control with fungicide applications based on calendar, local IPM, and warning system

Spolti

Valdebenito‐Sanhueza²,

Ponte

2011

Pesq. agropec. bras.

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-The objective of this work was to compare fungicide application timing for the control of sooty blotch and flyspeck (SBFS) of 'Fuji' apples in Rio Grande do Sul state, Brazil. The following treatments were evaluated in two growing seasons: two warning system-based (modified version of the Brown-Sutton-Hartmann system) spray of captan plus thiophanate methyl, with or without summer pruning; two calendar/rain-based spray of captan or a mixture of captan plus thiophanate methyl; fungicide spray timing based on a local integrated pest management (IPM) for the control of summer diseases; and a check without spraying. Sooty blotch and flyspeck incidence over time and their severity at harvest were evaluated. The highest number of spray was required by calendar/rain-based treatments (eight and seven sprays in the sequential years). The warning system recommended five and three sprays, in the sequential years, which led to the highest SBFS control efficacy expressed by the reduced initial inoculum and disease progress rate. Summer pruning enhanced SBFS control efficacy, especially by suppressing SBFS signs which tended to be restrained to the peduncle region of the fruit. Sooty blotch and flyspeck can be managed both with calendar and the grower-based IPM practices in Brazil, but a reduced number of sprays is required when the warning system is used.Index terms: Malus domestica, disease forecasting, fungicide management, integrated pest managemet. Controle de fuligem e sujeira-de-mosca com aplicações de fungicidas baseadas em calendário, MIP local e sistema de alertaResumo -O objetivo deste trabalho foi comparar épocas de aplicação de fungicida para o controle da fuligem e sujeira-de-mosca (FSM) em maçãs 'Fuji' no Estado do Rio Grande do Sul. Foram avaliados os seguintes tratamentos em dois ciclos de produção: dois baseados em sistema de previsão (modificação do sistema Brown-Sutton-Hartmann), com aplicação de captan em mistura com tiofanato metílico, com ou sem poda de verão; dois baseados em calendário ou ocorrência de chuva, com aplicação de captan ou mistura deste com tiofanato metílico; aplicação de fungicidas com base no manejo integrado de pragas (MIP) local para o controle de doenças de verão; e testemunha sem aplicação de fungicida. A incidência de FSM foi avaliada ao longo do tempo, e a severidade, na colheita. O maior número de aplicações (oito e sete em anos sequenciais) foi necessário nos tratamentos com recomendação de aplicação baseada no calendário. O sistema de previsão recomendou cinco e três aplicações, o que levou à maior eficiência de controle de FSM, pela redução de inóculo e da taxa de progresso da doença. A poda de verão incrementou a eficácia do controle da doença, especialmente pela restrição dos sinais de FSM na região peduncular do fruto. A FSM pode ser controlada tanto com o método do calendário, quanto com o uso das práticas de MIP com manejo local, mas o controle baseado no sistema de previsão requer menor número de aplicações.Termos para indexação: Malus domestica, previsão de d...

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“…The role of latent infections in influencing the pattern of disease progress curves has been discussed (Bergamin Filho & Amorim, 2002). However, the authors are not aware of any literature depicting the spatial patterns of fruit with latent infections, particularly studying its spatial association with rotted fruit from the same sample.…”

Section: Discussionmentioning

confidence: 99%

Comparative spatial analysis of the sooty blotch/flyspeck disease complex, bull’s eye and bitter rots of apples

et al. 2011

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The incidence of sooty blotch ⁄ flyspeck (SBFS) and bitter and bull's eye rots were assessed in a Fuji apple orchard during two seasons. Using a regular sampling design, 252 trees were selected and 20 fruits per tree were sampled at harvest and scored for disease incidence. For bitter and bull's eye rots, additional assessments were made on all symptomless fruit after a 30-day period of storage. Randomness in the spatial pattern was assessed using beta-binomial analysis of incidence data for three sampling scales (one, three or six adjacent trees as sampling units) and using Spatial Analysis by Distance Indices (SADIE) for disease counts for the 3-tree sampling scale. SADIE was also used for testing spatial associations between a pair of diseases, between years for the same disease or between rotted and latently infected fruit. Using a toroidal-shifts procedure, 360 maps of disease counts were created based on the observed data, which were further analysed using SADIE. Most datasets showed an aggregated spatial pattern, which was more consistent for the two fruit rots than SBFS, which showed distinct patterns depending on the year or method of analysis. The two fruit rots were spatially associated in most situations but SBFS and bull's eye rot were dissociated in one season. Results from virtual orchards showed that the patterns observed in the original maps may accurately represent those in similar apple-growing areas. Hypotheses regarding aspects of ecology and epidemiology of pathogens studied and potential efficacy of control measures in the region are discussed.

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Doenças com período de incubação variável em função da fenologia do hospedeiro

Cited by 26 publications

References 6 publications

Inheritance of bacterial spot resistance in Capsicum annuum var. annuum

Inheritance of bacterial spot resistance in Capsicum annuum var. annuum

Sooty blotch and flyspeck control with fungicide applications based on calendar, local IPM, and warning system

Comparative spatial analysis of the sooty blotch/flyspeck disease complex, bull’s eye and bitter rots of apples

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