ISHS Acta Horticulturae 733: III International Grapevine Phylloxera Symposium
INSIGHTS INTO THE EARLY DETECTION OF GRAPEVINE PHYLLOXERA FROM IN SITU HYPERSPECTRAL DATA |
| Authors: | L.J. Renzullo, A.L. Blanchfield, K.S. Powell |
| Keywords: | grapevine phylloxera, hyperspectral reflectance spectrometry |
| Abstract:
In the interests of characterising a “unique” spectral signature of phylloxera infestation, leaf-level reflectance spectrometry was employed in a glasshouse trial and at various vineyards throughout north eastern Victoria, Australia. These hyperspectral data were processed using statistical discriminant analysis to find narrow spectral features that may be exploited to separate phylloxera infestation from other stresses. Findings show that, at the leaf level, the method can differentiate phylloxera-infested vines from vines subjected to the other stresses investigated. There is, however, often confusion as to the spectral characteristics of the stress that may be uniquely attributed to phylloxera infestation. This paper describes the in situ hyperspectral reflectance data that were acquired over the course of a 2-year Cooperative Research Centre for Viticulture project on the early detection of phylloxera infestation in Australian vineyards. Focus is given to the methods of analysis used in the project. The results described, whilst applicable to the leaf-level reflectances, may not necessarily scale up to the canopy and therefore remotely-sensed signal; an area in need of further investigation. | |
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