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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
11/03/1999 |
Data da última atualização: |
11/03/1999 |
Autoria: |
CARVALHO JUNIOR, O. A. de; BAPTISTA, G. M. de M.; MADEIRA NETTO, J. da S.; MARTINS, E. de S.; CARVALHO, A. P. F.; MENESES, P. R. |
Título: |
Utilizacao de dados hiperespectrais do sensor A VIRIS para identificacao da feicao espectral da ligacao magnesio-hidroxila em latericos niqueliferos. |
Ano de publicação: |
1998 |
Fonte/Imprenta: |
In: SIMPOSIO BRASILEIRO DE SENSORIAMENTO REMOTO, 9., 1998, Santos, SP. Anais. Sao Jose dos Campos: INPE/MCT/SELPER, 1998. |
Páginas: |
nao paginado. |
Idioma: |
Português |
Conteúdo: |
Laterites containing nickel and occurring in the Votorantim mine in Niquelandia, GO, were sampled for mineral composition and reflectance spectra determinations in the laboratory. A VIRIS data of the sampled area, after atmospheric correction and reduction of radiance to scaled surface reflectance, were also used, with the objective of determining the spatial occurrences of nickel bearing minerals. Besides ferric oxides, the lateric material were rich in pimelite a clay mineral of the montmorilonite group presenting Mg-OH. In the reflectance spectra the Mg-OH bond is clearly identified by a sharp feature centered at 2300 nm regardless of the iron oxides occurrence. This feature could also be identified in the A VIRIS data. A simple arithmetic operation with two bands of the Mg-OH feature was useful in the determination of the occurrences of the pimelite rich laterites. |
Palavras-Chave: |
Brasil; Goias; Niquelandia. |
Thesagro: |
Cerrado; Sensoriamento Remoto. |
Thesaurus Nal: |
Brazil; remote sensing. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01783naa a2200277 a 4500 001 1544836 005 1999-03-11 008 1998 bl uuuu u00u1 u #d 100 1 $aCARVALHO JUNIOR, O. A. de 245 $aUtilizacao de dados hiperespectrais do sensor A VIRIS para identificacao da feicao espectral da ligacao magnesio-hidroxila em latericos niqueliferos. 260 $c1998 300 $anao paginado. 520 $aLaterites containing nickel and occurring in the Votorantim mine in Niquelandia, GO, were sampled for mineral composition and reflectance spectra determinations in the laboratory. A VIRIS data of the sampled area, after atmospheric correction and reduction of radiance to scaled surface reflectance, were also used, with the objective of determining the spatial occurrences of nickel bearing minerals. Besides ferric oxides, the lateric material were rich in pimelite a clay mineral of the montmorilonite group presenting Mg-OH. In the reflectance spectra the Mg-OH bond is clearly identified by a sharp feature centered at 2300 nm regardless of the iron oxides occurrence. This feature could also be identified in the A VIRIS data. A simple arithmetic operation with two bands of the Mg-OH feature was useful in the determination of the occurrences of the pimelite rich laterites. 650 $aBrazil 650 $aremote sensing 650 $aCerrado 650 $aSensoriamento Remoto 653 $aBrasil 653 $aGoias 653 $aNiquelandia 700 1 $aBAPTISTA, G. M. de M. 700 1 $aMADEIRA NETTO, J. da S. 700 1 $aMARTINS, E. de S. 700 1 $aCARVALHO, A. P. F. 700 1 $aMENESES, P. R. 773 $tIn: SIMPOSIO BRASILEIRO DE SENSORIAMENTO REMOTO, 9., 1998, Santos, SP. Anais. Sao Jose dos Campos: INPE/MCT/SELPER, 1998.
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Registro original: |
Embrapa Cerrados (CPAC) |
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Registro Completo
Biblioteca(s): |
Embrapa Mandioca e Fruticultura; Embrapa Uva e Vinho. |
Data corrente: |
18/09/2018 |
Data da última atualização: |
27/04/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
BASSANEZI, R. B.; CZERMAINSKI, A. B. C.; BARBOSA, F. F. L.; MOREIRA, A. S.; RIBEIRO JUNIOR, P. J.; KRAINSKI, E. T.; AMORIM, L. |
Afiliação: |
R. B. BASSANEZI, Fundecitrus; ANA BEATRIZ COSTA CZERMAINSKI, CNPUV; FRANCISCO FERRAZ LARANJEIRA BARBOSA, CNPMF; ALECIO SOUZA MOREIRA, CNPMF; P. J. RIBEIRO JUNIOR, UFPR; E. T. KRAINSKI, UFPR; L. AMORIM, USP. |
Título: |
Spatial patterns of the Citrus leprosis virus and its associated mite vector in systems without intervention. |
Ano de publicação: |
2018 |
Fonte/Imprenta: |
Plant Pathology, 2018.[online] |
DOI: |
10.1111/ppa.12930 |
Idioma: |
Inglês |
Notas: |
Publicação impressa em: Plant Pathology, v. 68, p. 85-93, 2019. |
Conteúdo: |
Leprosis is caused by the Citrus leprosis virus cytoplasmic type and is vectored by the mite Brevipalpus yothersi. Miticide applications, which cost $54 million annually, are based on inspection for the presence of mites. The aim of the present study was to characterize the spatial patterns of B. yothersi-infested trees and trees with leprosis symptoms for further improvement in sampling and disease control. The presence of mites and the occurrence of leprosis were assessed over two years in 1160 Valencia trees and 720 Natal trees in a commercial sweet orange grove in Sao Paulo State, Brazil. To assess the natural growth and dispersal of mites and leprosis, mite populations were not controlled during the experimental period. Maps of mite-infested trees and trees with leprosis symptoms were analysed at three different levels of spatial hierarchy using complementary methods, i.e. among adjacent trees within and across rows, within quadrats, and the strength and orientation of aggregation among quadrats. The study showed that the spatial patterns of virus-infected and mite-infested trees were different, with a strong aggregation pattern of trees with leprosis symptoms that increased over time. Conversely, the spatial pattern of B. yothersi showed randomness or weak aggregation at all three spatial hierarchical levels. Disease incidence increased steadily in plots of both cultivars, unlike in miteinfested trees where incidence fluctuated over time. These results have important implications for the development of better management strategies for leprosis. Sampling methods and action thresholds for mite control should consider primary disease inoculum in addition to the incidence of mites. Keywords: Brevipalpus yothersi, Citrus leprosis virus, Citrus sinensis, epidemiology, flat mite, spatial analysis MenosLeprosis is caused by the Citrus leprosis virus cytoplasmic type and is vectored by the mite Brevipalpus yothersi. Miticide applications, which cost $54 million annually, are based on inspection for the presence of mites. The aim of the present study was to characterize the spatial patterns of B. yothersi-infested trees and trees with leprosis symptoms for further improvement in sampling and disease control. The presence of mites and the occurrence of leprosis were assessed over two years in 1160 Valencia trees and 720 Natal trees in a commercial sweet orange grove in Sao Paulo State, Brazil. To assess the natural growth and dispersal of mites and leprosis, mite populations were not controlled during the experimental period. Maps of mite-infested trees and trees with leprosis symptoms were analysed at three different levels of spatial hierarchy using complementary methods, i.e. among adjacent trees within and across rows, within quadrats, and the strength and orientation of aggregation among quadrats. The study showed that the spatial patterns of virus-infected and mite-infested trees were different, with a strong aggregation pattern of trees with leprosis symptoms that increased over time. Conversely, the spatial pattern of B. yothersi showed randomness or weak aggregation at all three spatial hierarchical levels. Disease incidence increased steadily in plots of both cultivars, unlike in miteinfested trees where incidence fluctuated over time. These results have important i... Mostrar Tudo |
Palavras-Chave: |
Brevipalpus yothersi; Citrus leprosis virus; Flat mite; Leprosis; Spatial analysis; Spatial patterns. |
Thesagro: |
Citrus Sinensis; Fruta Cítrica. |
Thesaurus NAL: |
Epidemiology. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/190446/1/Bassanezi-et-al-2019-Plant-Pathology.pdf
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Marc: |
LEADER 02820naa a2200325 a 4500 001 2103966 005 2019-04-27 008 2018 bl uuuu u00u1 u #d 024 7 $a10.1111/ppa.12930$2DOI 100 1 $aBASSANEZI, R. B. 245 $aSpatial patterns of the Citrus leprosis virus and its associated mite vector in systems without intervention.$h[electronic resource] 260 $c2018 500 $aPublicação impressa em: Plant Pathology, v. 68, p. 85-93, 2019. 520 $aLeprosis is caused by the Citrus leprosis virus cytoplasmic type and is vectored by the mite Brevipalpus yothersi. Miticide applications, which cost $54 million annually, are based on inspection for the presence of mites. The aim of the present study was to characterize the spatial patterns of B. yothersi-infested trees and trees with leprosis symptoms for further improvement in sampling and disease control. The presence of mites and the occurrence of leprosis were assessed over two years in 1160 Valencia trees and 720 Natal trees in a commercial sweet orange grove in Sao Paulo State, Brazil. To assess the natural growth and dispersal of mites and leprosis, mite populations were not controlled during the experimental period. Maps of mite-infested trees and trees with leprosis symptoms were analysed at three different levels of spatial hierarchy using complementary methods, i.e. among adjacent trees within and across rows, within quadrats, and the strength and orientation of aggregation among quadrats. The study showed that the spatial patterns of virus-infected and mite-infested trees were different, with a strong aggregation pattern of trees with leprosis symptoms that increased over time. Conversely, the spatial pattern of B. yothersi showed randomness or weak aggregation at all three spatial hierarchical levels. Disease incidence increased steadily in plots of both cultivars, unlike in miteinfested trees where incidence fluctuated over time. These results have important implications for the development of better management strategies for leprosis. Sampling methods and action thresholds for mite control should consider primary disease inoculum in addition to the incidence of mites. Keywords: Brevipalpus yothersi, Citrus leprosis virus, Citrus sinensis, epidemiology, flat mite, spatial analysis 650 $aEpidemiology 650 $aCitrus Sinensis 650 $aFruta Cítrica 653 $aBrevipalpus yothersi 653 $aCitrus leprosis virus 653 $aFlat mite 653 $aLeprosis 653 $aSpatial analysis 653 $aSpatial patterns 700 1 $aCZERMAINSKI, A. B. C. 700 1 $aBARBOSA, F. F. L. 700 1 $aMOREIRA, A. S. 700 1 $aRIBEIRO JUNIOR, P. J. 700 1 $aKRAINSKI, E. T. 700 1 $aAMORIM, L. 773 $tPlant Pathology, 2018.[online]
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