[1] [1] Zhang X, Liu F, He Y, et al. Biosystems Engineering, 2013, 115(1): 56.

[2] [2] Xie C, Yang C, He Y. Computers and Electronics in Agriculture, 2017, 135: 154.

[5] [5] Murphy R J, Schneider S, Monteiro S T. IEEE Transactions on Geoscience and Remote Sensing, 2014, 52(5): 2843.

[6] [6] Lowe A, Harrison N, French A P. Plant Methods, 2017, 13(1): 80.

[7] [7] Shafri H Z M, Hamdan N, Anuar M I. International Journal of Remote Sensing, 2012, 33(14): 4293.

[8] [8] Niphadkar N P, Burks T F, Qin J W, et al. International Journal of Agricultural and Biological Engineering, 2013, 6(3): 41.

[9] [9] Baranowski P, Jedryczka M, Mazurek W, et al. PLoS ONE, 2015, 10: e0122913.

[10] [10] Lu J, Zhou M, Gao Y, et al. Precision Agriculture, 2017, (1): 1.

[11] [11] Xie C, Shao Y, Li X, et al. Scientific Report, 2015, 5: 16564.

[12] [12] Xie C, He Y. Sensors, 2016, 16(5): 676.

[13] [13] Egel D S, Harmon P. Plant Disease, 2001, 85(10): 1081.

[14] [14] Huang J S, Huang J H, Chen P S. Plant Pathology Bulletin, 2011, 20(1): 21.

[17] [17] Neto A J S, Moura L O, Lopes D C, et al. Journal of the Science of Food and Agriculture, 2017, 97: 2015.