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Hamed Ghobari

Hamed Ghobari

Academic rank: Associate Professor
ORCID:
Education: PhD.
ScopusId: 56801091100
Faculty: Faculty of Agriculture
Address:
Phone: 09183715818

Research

Title
Monitoring Infestations of Oak Forests by Tortrix viridana (Lepidoptera: Tortricidae) using Remote Sensing
Type
JournalPaper
Keywords
oak leaf roller; Marivan city; Landsat satellite; Quercus infectoria Quercus brantii
Year
2016
Journal PLANT PROTECTION SCIENCE
DOI
Researchers Leila Gooshbor ، Mahtab Pir Bavaghar ، Jamil Amanollahi ، Hamed Ghobari

Abstract

We tested the suitability of Landsat images to track defoliation by insect herbivory with focus on the oak leaf roller, Tortrix viridana (Lep.: Tortricidae). Landsat images from the period before (2002) and after the T. viridanainfestation (2007, 2014) were compared in oak forests of Zagros in western Iran. The Normalised Difference Vegetation Index (NDVI) was calculated for the test area from Landsat 5, 7, and 8 images. Because the red and near-infrared spectral bands of Landsat 8 OLI sensors are different from the other two, a model for the calibration of Landsat OLI NDVI was developed. The proposed model with a correlation coefficient of 0.928 and root mean square error of 0.05 turned out to be applicable and the NDVI decreased significantly during the observation period. Taking into account the protection status of the area and small fluctuations in temperature, the decrease in NDVI could be attributed to T. viridana damage.