Use of UAV images to assess narrow brown leaf spot severity in rice
Abstract
Abstract: Unmanned aerial vehicle (UAV) remote sensing is a potential tool to reduce crop yield losses caused by numerous diseases through near real-time detection and monitoring on disease progression. However, limited research has been conducted to effectively integrate this technology into current crop management systems for disease control. In this study, the feasibility of assessing the severity of narrow brown leaf spot (NBLS) in rice based on UAV remote sensing platform was explored. RGB and NIR images were obtained using Sentera Multispectral Double 4K sensor attached to DJI INSPIRE 2 drone flying at two altitudes (10 m and 15 m). Ground-truth data on disease severity were collected through visual assessment of field plots with different levels of disease severity. Five out of 21 vegetation indices have a coefficient of determination (R2) value greater than 0.8 based on unitary linear regression. The index with the highest R2 is Excess Green minus Excess Red (ExGR). The results of unitary regression analysis demonstrated more suitability of using RGB images for rice NBLS assessment over NIR images. Further analyses were conducted on disease-infected plot data that were divided into two groups with 2/3 of the plot data as modeling set and the remaining as evaluation set. The ExGR has the highest R2 value and the lowest RMSE value in both modeling and evaluation sets regardless of drone flight height (10 m or 15 m). The RMSE at 15 m is lower than at 10 m but there was no significant difference of R2, thus the 15-m flight height is better than the 10-m height in detecting the levels of disease severity. The comparison of ExGR and HIS-H demonstrated that vegetation index is more suitability for detecting rice NBLS disease with more spectral information. When disease severity data were divided into two score groups (0 to 5 and 6 to 9 for the low and high levels of disease, respectively) or three score groups (0 to 3, 4 to 6 and 7 to 9 for the low, moderate and high levels of disease, respectively), the ExGR was more suitable for the detection of the high levels of disease. These results demonstrated the feasibility of using UAV images as a potential tool to assess the severity of NBLS, an important fungal foliar disease in rice worldwide.
Keywords: UAV remote sensing, multispectral sensor, narrow brown leaf spot, disease severity, rice
DOI:Â 10.33440/j.ijpaa.20190202.47.
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Citation: Cai N, Zhou X G, Yang Y B, Wang J, Zhang D Y, Hu R J.  Use of UAV images to assess narrow brown leaf spot severity in rice.  Int J Precis Agric Aviat, 2019; 2(2): 38–42.Full Text:
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Muthayya S, Sugimoto J D, Montgomery S. An overview of global rice production, supply, trade, and consumption. Annals of the New York Academy of Sciences, 2014, 1327(1): 7. doi: 10.1111/nyas.12540
Zhou X G, Young-Ki J. Disease management. The Texas rice production guidelines. Texas AgriLife Research and Texas AgriLife Extension. B-6131. 2014, pp. 44–56.
Kirandeep K M, Clayton A. Hollier, Donald E G. Effect of planting date, fungicide timing and cultivar susceptibility on severity of narrow brown leaf spot and yield of rice. Crop Protection, 2016, 90: 186–187. doi: 10.1016/j.cropro.2016.07.029
Peng S B, Tang Q Y, Zou Y B. Current status and challenges of rice production in China. Plant Production Science, 2009, 12(1): 3–4. doi: 10.1626/pps.12.3
Zhang J C, Yuan L, Wang J H. Research progress of crop diseases and pests monitoring based on remote sensing. Transactions of the Chinese Society of Agricultural Engineer, 2012, 28(20): 1. doi: 10.3969/ j.issn.1002-6819.2012.20.001.
Graeff S, Link J, Claupein. Identification of powdery mildew (Erysiphegraminis sp. tritici) and take-all disease (Gaeumannomyces graminis sp. tritici) in wheat (Triticum aestivum L.) by means of leaf reflectance measurements. Central European Journal of Biology, 2006, 1(2): 275–288. doi: 10.2478/s11535-006-0020-8
Li B, Liu Z Y, Huang J F. Hyperspectral identification of rice diseases and pests based on principal component analysis and probabilistic neural network. Transactions of the Chinese Society of Agricultural Engineer, 2009, 25(9): 143–146. doi: 10.3969/j.issn.1002-6819.2009.09.026
Huang, J F, Apan, A. Detection of sclerotinia rot disease on celery using hyperspectral data and partial least squares regression. Journal of Spatial science, 2006, 52(2): 129–142. doi: 10.1080/14498596.2006.9635087
Yang C M, Cheng C H, Chen R K. Changes in spectral characteristices of rice canopy infested with brown planthopper and leaffolder, Crop Science, 2007, 47(1): 329–335. doi: 10.2135/cropsci2006.05.0335
HUANG W J, Lamb D W, Niu Z. Identification of yellow rust in wheat using in-situ spectral reflectance measurements and airborne hyperspectral imaging. Precision Agriculture, 2007, 8(5): 187–197. doi: 10.1007/ s11119-007-9038-9
Delwiche S R, Kim M S. Hyperspectral imaging for detection of scab in wheat. Biological Quality and Precision Agriculture â…¡, 2000, 4203:
–20. doi: 10.1117/12.411752
Yang C H, Everitt J H, Fernandes C J. Comparision of airborne multispectral and hyperspectral imagery for mapping cotton root rot. Biosystems Engineering, 2010, 107(2): 131–139. doi: 10.1016/ j.biosyste- mseng.2010.07.011
Jonas F, Menz G. Multi-temporal wheat disease detection by multispectral remote sensing. Precision Agriculture, 2007, 8(3): 161–172. doi: 10.1007/s11119-007-9036-y
Zhao C J. The development of agricultural remote sensing research and application. Journal of Agricultural Machinery, 2014, 45(12): 277–293.. doi: 10.6041/ j.issn.1000-1298.2014.12.041
Li D R, Li M. Research progress and application prospect of UAV remote sensing system. Journal of Wuhan University (Information Science Edition), 2014, 39(05): 505–513+540. doi: 10.13203/ j.whugis2014 0045
Mahlein A K. Plant disease detection by imaging sensors–parallels and specific demands for precision agriculture and plant phenotyping. Plant Disease, 2016, 100(2): 241. doi: 10.1094/PDIS-03-15-0340-FE
Ballesteros R, Ortega J F, Hernandez D. Applications of georeferenced high-resolution images obtained with unmanned aerial vehicles. Part â… : Description of image Acquisition and processing. Precision Agriculture, 2014, 15(6): 579. doi: 10.1007/s11119-014-9355-8
Zhang J, Yang C H, Song H B. Evaluation of an airborne remote sensing platform consisting of two Consumer-Grade cameras for crop identification. Remote Sensing, 2016, 8(3): 257. doi: 10.3390/rs8030257
Mulla, David J. Twenty five years of remote sensing in precision agriculture: Key advances and remaining knowledge gaps. Biosystems Engineers, 2013, 114(4): 358–371. doi: 10.1016/j.biosystemseng.2012.08.009
Zhang D, Zhou X G, Zhang J, Lan Y, Xu C, Liang D. Detection of rice sheath blight using an unmanned aerial system with high-resolution color and multispectral imaging. PLoS ONE, 2018, 13(5): e0187470. doi: 10.1371/journal.pone.0187470
Uppala S, Zhou X G. Field efficacy of fungicides for management of sheath blight and narrow brown leaf spot of rice. Crop Protection, 2018, 104: 72–77. doi: 10.1016/j.cropro.2017.10.017
Uppala S, Zhou X G. Optimum timing of propiconazole to manage narrow brown leaf spot in the main and ratoon crops in Texas. Crop Protection, 2019, 124: 1–6. doi: 10.1016/j.cropro.2019.104854
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