sensors Article New Spectral Index for Detecting Wheat Yellow Rust Using Sentinel-2 Multispectral Imagery Qiong Zheng 1,2, Wenjiang Huang 2,3,*, Ximin Cui 1, Yue Shi 2,4 ID and Linyi Liu 2,4 1 College of Geoscience and Surveying Engineering, China University of Mining and Technology (...