Plant Disease Severity Estimated Visually, by Digital Photography and Image Analysis, and by Hyperspectral Imaging

Bock, Clive H.; Poole, Gavin H.; Parker, P. E.; Gottwald, T. R.

doi:10.1080/07352681003617285

Cited by 762 publications

(577 citation statements)

References 159 publications

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“…Iguais alturas implicam um valor de u igual a 0. Portanto, um avaliador perfeito é aquele em que suas estimativas estão todas iguais à linha concordante, ou seja, r = 1, Cb = 1 [υ = 1, u = 0], e, consequentemente, pc = 1 (NITA et al, 2003;BOCK et al, 2010;CAPUCHO et al, 2011;YADAV et al, 2012).…”

Section: −1unclassified

Validação de escala diagramática para quantificação da severidade da antracnose do colmo do milho

et al. 2015

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RESUMO Objetivou-se propor e validar uma escala diagramática para quantificar a antracnose do colmo em milho. A severidade da antracnose foi estimada por dez avaliadores sem o uso de escala em 139 entrenós, e os mesmos avaliadores avaliaram os entrenós usando uma escala publicada anteriormente na literatura (primeira escala) e uma nova escala proposta. Com o uso da escala proposta, todas as variáveis foram significativamentediferentes em relação à primeira escala, e os valores foram mais próximos de uma medição acurada (r=0,97, C b =0.98, u=0.09, υ=1.06, ρ c =0.96 INTRODUÇÃOA antracnose do colmo Colletotrichum graminicola (Ces.) Wils é uma das doenças mais importantes na cultura do milho em vários países, causando acamamento das plantas, redução na produção e qualidade dos grãos (BERGSTROM & NICHOLSON, 1999;COTA et al., 2012;MATIELLO et al., 2013). Os sintomas da antracnose do colmo são mais visíveis após o florescimento das plantas de milho, porém o processo infeccioso inicia-se pelos propágulos provenientes das lesões foliares ou daqueles presentes em restos culturais. Na casca, surgem lesões estreitras, longitudinais e com aspecto encharcado, que são inicialmente de coloração pardo-avermelhada, posteriormente tornando-se marromescuras a negras. Nos tecidos internos do colmo, ocorre uma coloração marrom-escura, que entra em processo de desintegração, afetando o fluxo de água e nutrientes do colmo para a parte superior, podendo ocasionar a morte prematura e o acamamento das plantas (KELLER &

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Section: −1unclassified

Validação de escala diagramática para quantificação da severidade da antracnose do colmo do milho

et al. 2015

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“…At the same time, there is a need for the evolution of plant health regulatory frameworks to catch up with the latest scientific developments, from taxonomic advancements (e.g. the identification of novel Phytophthora species: Jung et al 2011;Vettraino et al 2011) to network epidemiology (Jeger et al 2007;Keller et al 2011) and digital pest diagnostics and severity estimation (Bock et al 2010;Norton and Taylor 2010). The involvement of the many stakeholders in plant health (Furstenau et al 2007;Macleod et al 2010) deserves repetition in more than one section of this review, as it can be beneficial not just to adapt the regulatory framework, but also to improve dissemination of plant health knowledge (Jacobi et al 2011;Rebaudo and Dangles 2011) and to devise effective response strategies to new invasive pathogens (Crall et al 2010).…”

Section: Interdisciplinarity Stakeholder Involvement and Trade-offsmentioning

confidence: 99%

Impacts of climate change on plant diseases—opinions and trends

et al. 2012

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There has been a remarkable scientific output on the topic of how climate change is likely to affect plant diseases. This overview addresses the need for review of this burgeoning literature by summarizing opinions of previous reviews and trends in recent studies on the impacts of climate change on plant health. Sudden Oak Death is used as an introductory case study: Californian forests could become even more susceptible to this emerging plant disease, if spring precipitations will be accompanied by warmer temperatures, although climate shifts may also affect the current synchronicity between host cambium activity and pathogen colonization rate. A summary of observed and predicted climate changes, as well as of direct effects of climate change on pathosystems, is provided. Prediction and management of climate change effects on plant health are complicated by indirect effects and the interactions with global change drivers. Uncertainty in models of plant disease development under climate change calls for a diversity of management strategies, from more participatory approaches to interdisciplinary science. Involvement of stakeholders and scientists from outside plant pathology shows the importance of trade-offs, for example in the land-sharing vs. sparing debate. Further research is needed on climate change and plant health in mountain, boreal, Mediterranean and tropical regions, with multiple climate change factors and scenarios (including our responses to it, e.g. the assisted migration of plants), in relation to endophytes, viruses and mycorrhiza, using long-term and large-scale datasets and considering various plant disease control methods.Keywords Adaptive ecosystem management . Biotic interactions . Landscape pathology . Phytophthora ramorum . Plant disease epidemiology . Tree fungal pathogens Up to the 1990s, there was little information about climate change impacts on plant disease. For example, Eur J Plant Pathol

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“…Generally, ChF yield is highest when photochemistry and heat dissipation are lowest. Changes in ChF function take place before changes in Chl content, before any physical signs of tissue or chlorophyll deterioration are manifested in the plant, and therefore alterations in the fluorescence signal occur before any visible signs are apparent (Moshou et al 2005, Bock et al 2010.…”

Section: Chlorophyll Fluorescencementioning

confidence: 99%

Application of remote sensing techniques for the identification of biotic stress in plum trees caused by the Plum pox virus

Krezhova

Stoev

Petrov

et al. 2015

Folia Horticulturae

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Two hуperspectral remote sensing techniques, spectral reflectance and chlorophyll fluorescence, were used for the identification of biotic stress (sharka disease) in plum trees at an early stage without visible symptoms on the leaves. The research was focused on cultivars that are widely spread in Bulgaria: 'Angelina', 'Black Diamond' and 'Mirabelle'. Hyperspectral reflectance and fluorescence data were collected by means of a portable multichannel fibre-optics spectrometer in the visible and near infrared spectral ranges (400-1000 nm). Statistical and deterministic analyses were applied for assessing the significance of the differences between the spectral data of healthy (control) and infected plum leaves. Comparative analyses were performed with complementary serological test DAS-ELISA, broadly implemented in plant virology. The strong relationship that was found between the results from the two remote sensing techniques and serological analysis indicates the applicability of hyperspectral reflectance and fluorescence techniques for conducting health condition assessments of vegetation easily and without damage before the appearance of visible symptoms.Ke y wor d s: chlorophyll fluorescence, DAS-ELISA, hуperspectral remote sensing, leaf reflectance, sharka

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Plant Disease Severity Estimated Visually, by Digital Photography and Image Analysis, and by Hyperspectral Imaging

Cited by 762 publications

References 159 publications

Validação de escala diagramática para quantificação da severidade da antracnose do colmo do milho

Validação de escala diagramática para quantificação da severidade da antracnose do colmo do milho

Impacts of climate change on plant diseases—opinions and trends

Application of remote sensing techniques for the identification of biotic stress in plum trees caused by the Plum pox virus

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