remote sensing Article Assessment of Poplar Looper (Apocheima cinerarius Erschoff) Infestation on Euphrates (Populus euphratica) Using Time-Series MODIS NDVI Data Based on the Wavelet Transform and Discriminant Analysis Tiecheng Huang 1,2, Xiaojuan Ding 2, Xuan Zhu 3 , Shujiang Chen 2, Mengyu Chen 1, Xiang Jia 1, Fengbing Lai 2 and Xiaoli Zhang 1,* 1 Beijing Key Laboratory of Precision Forestry, Forestry College, Beijing Forestry University, Beijing 100083, China;
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[email protected]; Tel.: +86-010-62336227 Abstract: Poplar looper (Apocheima cinerarius Erschoff) is a destructive insect infesting Euphrates or desert poplars (Populus euphratica) in Xinjiang, China. Since the late 1950s, it has been plaguing Citation: Huang, T.; Ding, X.; Zhu, desert poplars in the Tarim Basin in Xinjiang and caused widespread damages. This paper presents X.; Chen, S.; Chen, M.; Jia, X.; Lai, F.; an approach to the detection of poplar looper infestations on desert poplars and the assessment of Zhang, X. Assessment of Poplar the severity of the infestations using time-series MODIS NDVI data via the wavelet transform and Looper (Apocheima cinerarius Erschoff) discriminant analysis, using the middle and lower reaches of the Yerqiang River as a case study.