数字农科院2.0

Monitoring Maize Leaf Spot Disease Using Multi-Source UAV Imagery

文献类型： 外文期刊

作者： Xiao Jia;Dameng Yin;Yali Bai;Xun Yu;Yang Song;Minghan Cheng;Shuaibing Liu;Yi Bai;Lin Meng;Yadong Liu;Qian Liu;Fei Nan;Chenwei Nie;Lei Shi;Ping Dong;Wei Guo;Xiuliang Jin

作者机构：

关键词： maize leaf spot;multi-source imagery;random forest;UAV

期刊名称： Drones

ISSN： 2504-446X

年卷期： 2023 年 7 卷 11 期

页码：

收录情况： SCIE（2023版）

摘要： Maize leaf spot is a common disease that hampers the photosynthesis of maize by destroying the pigment structure of maize leaves, thus reducing the yield. Traditional disease monitoring is time-consuming and laborious. Therefore, a fast and effective method for maize leaf spot disease monitoring is needed to facilitate the efficient management of maize yield and safety. In this study, we adopted UAV multispectral and thermal remote sensing techniques to monitor two types of maize leaf spot diseases, i.e., southern leaf blight caused by Bipolaris maydis and Curvularia leaf spot caused by Curvularia lutana. Four state-of-the-art classifiers (back propagation neural network, random forest (RF), support vector machine, and extreme gradient boosting) were compared to establish an optimal classification model to monitor the incidence of these diseases. Recursive feature elimination (RFE) was employed to select features that are most effective in maize leaf spot disease identification in four stages (4, 12, 19, and 30 days after inoculation). The results showed that multispectral indices involving the red, red edge, and near-infrared bands were the most sensitive to maize leaf spot incidence. In addition, the two thermal features tested (i.e., canopy temperature and normalized canopy temperature) were both found to be important to identify maize leaf spot. Using features filtered with the RFE algorithm and the RF classifier, maize infected with leaf spot diseases were successfully distinguished from healthy maize after 19 days of inoculation, with precision >0.9 and recall >0.95. Nevertheless, the accuracy was much lower (precision = 0.4, recall = 0.53) when disease development was in the early stages. We anticipate that the monitoring of maize leaf spot disease at the early stages might benefit from using hyperspectral and oblique observations.

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