%0 Conference Proceedings
%4 sid.inpe.br/marte2/2017/10.27.13.15.30
%2 sid.inpe.br/marte2/2017/10.27.13.15.31
%@isbn 978-85-17-00088-1
%F 60114
%T Espectrorradiometria para detecção de alterações na assinatura espectral de folhas de videiras por doenças de causa fúngica e viral
%D 2017
%A Junges, Amanda Heemann,
%A Almança, Marcus André Kurtz,
%A Ducati, Jorge Ricardo,
%A Lampugnani, Cristian Scalvi,
%@electronicmailaddress amanda-junges@fepagro.rs.gov.br
%E Gherardi, Douglas Francisco Marcolino,
%E Aragão, Luiz Eduardo Oliveira e Cruz de,
%B Simpósio Brasileiro de Sensoriamento Remoto, 18 (SBSR)
%C Santos
%8 28-31 maio 2017
%I Instituto Nacional de Pesquisas Espaciais (INPE)
%J São José dos Campos
%P 3680-3686
%S Anais
%1 Instituto Nacional de Pesquisas Espaciais (INPE)
%X Considering the causal agents of grapevine decline and death in vineyards, we can highlight the Grapevine Trunk Diseases, such as the Esca fungal complex and the Grapevine leafroll-associated virus (GLRaV). The identification and quantification of changes in leaf spectral signature by remote sensing can improve the vinegrape diseases diagnosis. The aim of this study was to characterize the spectral features of vines leaves by spectroradiometry, to detect changes due to the occurrence of Esca fungal complex and the Grapevine leafroll-associated virus. For this, grapevine leaves were collected in May, 2015 and May, 2016 in a ''Merlot'' vineyard located in Veranópolis, Rio Grande do Sul, Brazil. The reflectance measurements were performed using a spectroradiometer in 350 to 2500 nm wavelenghts. The treatments consisted of asymptomatic leaves (1), (2) leaves with symptoms of GLRaV and leaves with initial (3) and final (4) symptoms of the Esca fungal complex. The results indicated that the spectral reflectance of vine leaves with GLRaV and Esca symptoms were distinct from the asymptomatic leaves spectral reflectance. There were increase of reflectance at wavelengths near 700 nm, that indicated reduction in leaf chlorophyll concentration and photosynthetic activity due to the pathogens. Leaves with GLRaV symptoms showed spectral changes at wavelengths near to 550 nm, that can be used to discriminate this disease.
%9 Monitoramento agrícola
%@language pt
%3 60114.pdf