Co-Authors:
Herrmann, I., Remote Sensing Laboratory, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boker, Israel
Berenstein, M., Department of Geography and Environmental Development, Ben-Gurion University of the Negev, Beer-Sheva, Israel
Sade, A., Biobee Ltd, Sde Eliyahu, Israel
Karnieli, A., Remote Sensing Laboratory, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boker, Israel, Field Crops and Natural Resources Department, Agricultural Research Organization, Gilat Research Center, Israel
Bonfil, D.J., Department of Entomology, Agricultural Research Organization, Gilat Research Center, Israel
Weintraub, P.G., Department of Entomology, Agricultural Research Organization, Gilat Research Center, Israel
Abstract:
Two-spotted spider mites (TSSM; Tetranychus urticae Koch) cause significant damage to crops and yields, in the field as well as in greenhouses. By feeding, TSSM destroy chloroplast-containing cells; this damage can be spectrally detected in the reflectance of the visible and near-infrared regions. This study focuses on hyperspectral reflectance data of greenhouse pepper (Capsicum annuum) leaves, obtained by integrated sphere. The reflectance data were transformed into vegetation indices allowing early TSSM damage detection by separation between leaf damage levels. One-way analysis of variance of coupled damage levels was applied to each of the vegetation indices.We concluded that early identification of TSSM greenhouse pepper leaf damage can be obtained by multispectral means. Furthermore, the proposed methods may identify the damage on the upper side of the leaves although the TSSM feed on the underside of leaves. © 2012 Taylor & Francis.
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