Early Detection of Wheat Yellow Rust Disease and Its Impact on Terminal Yield with Multi-Spectral UAV-Imagery

被引:16
|
作者
Nguyen, Canh [1 ,2 ,3 ]
Sagan, Vasit [1 ,2 ]
Skobalski, Juan [1 ,2 ,4 ]
Severo, Juan Ignacio [4 ]
机构
[1] Taylor Geospatial Inst, St Louis, MO 63108 USA
[2] St Louis Univ, Dept Earth & Atmospher Sci, St Louis, MO 63108 USA
[3] Univ Cent Missouri, Dept Aviat, Warrensburg, MO 64093 USA
[4] GDM Seeds, RA-6740 Chacabuco, Buenos Aires, Argentina
关键词
yellow rust; disease; crop yield; yield loss; UAV; machine learning; temporal-spatio-spectral fusion; LEAF CHLOROPHYLL CONTENT; VEGETATION INDEXES; REFLECTANCE MEASUREMENTS; SPECTRAL REFLECTANCE; NEURAL-NETWORKS; STRIPE RUST; SOIL; IDENTIFICATION; PREDICTION; COLOR;
D O I
10.3390/rs15133301
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The food production system is vulnerable to diseases more than ever, and the threat is increasing in an era of climate change that creates more favorable conditions for emerging diseases. Fortunately, scientists and engineers are making great strides to introduce farming innovations to tackle the challenge. Unmanned aerial vehicle (UAV) remote sensing is among the innovations and thus is widely applied for crop health monitoring and phenotyping. This study demonstrated the versatility of aerial remote sensing in diagnosing yellow rust infection in spring wheats in a timely manner and determining an intervenable period to prevent yield loss. A small UAV equipped with an aerial multispectral sensor periodically flew over, and collected remotely sensed images of, an experimental field in Chacabuco (-34.64; -60.46), Argentina during the 2021 growing season. Post-collection images at the plot level were engaged in a thorough feature-engineering process by handcrafting disease-centric vegetation indices (VIs) from the spectral dimension, and grey-level co-occurrence matrix (GLCM) texture features from the spatial dimension. A machine learning pipeline entailing a support vector machine (SVM), random forest (RF), and multilayer perceptron (MLP) was constructed to identify locations of healthy, mild infection, and severe infection plots in the field. A custom 3-dimensional convolutional neural network (3D-CNN) relying on the feature learning mechanism was an alternative prediction method. The study found red-edge (690-740 nm) and near infrared (NIR) (740-1000 nm) as vital spectral bands for distinguishing healthy and severely infected wheats. The carotenoid reflectance index 2 (CRI2), soil-adjusted vegetation index 2 (SAVI2), and GLCM contrast texture at an optimal distance d = 5 and angular direction & theta; = 135 & DEG; were the most correlated features. The 3D-CNN-based wheat disease monitoring performed at 60% detection accuracy as early as 40 days after sowing (DAS), when crops were tillering, increasing to 71% and 77% at the later booting and flowering stages (100-120 DAS), and reaching a peak accuracy of 79% for the spectral-spatio-temporal fused data model. The success of early disease diagnosis from low-cost multispectral UAVs not only shed new light on crop breeding and pathology but also aided crop growers by informing them of a prevention period that could potentially preserve 3-7% of the yield at the confidence level of 95%.
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页数:28
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