Abstract
Abstract. For eliminating pine trees infected pine wilt disease in southern China based on remote sensing technique, it is important to ensure the provision of timely information about individual diseased tree. It is not easy to detect and extract the diseased pine trees from conventional remote sensing techniques. This paper proposes a new approach for extracting information about individual diseased tree, without the use of satellite images and aerial hyperspectral images. Field measurements in different leaf infected stages indicates the possibility of extracting diseased trees by using only the three regular bands, red, green and blue. VEG was selected and proved to be the optimal index in 12 vegetation indices from the three visible bands. Using the adaptive local threshold selection methods, VEG grayscale image pixels could be automatically segmented into the diseased trees region. Based on mathematical morphology, the accuracy of individual tree information extraction reached 90%.
Highlights
Pine wilt disease (PWD), caused by Bursaphelenchus xylophilus, the pine wood nematode (PWN), is one of the most dangerous and destructive disease to forests in the world
After comparison of the 12 kinds of vegetation indices, the grayscale images of Red-Green Index (RGI) and Vegetation Index (VEG) were selected for threshold image segmentation
We have proposed a new approach to extract the information about the individual tree infected by PWD for ecological protection in the mountainous and hilly areas in southern China, without the use of satellite images and aerial hyperspectral images
Summary
Pine wilt disease (PWD), caused by Bursaphelenchus xylophilus, the pine wood nematode (PWN), is one of the most dangerous and destructive disease to forests in the world. It is known as the cancer of pine trees because of its wide transmission path, high speed, difficult control and high cost. The disease has spread to 16 provinces such as Zhejiang, Anhui, Fujian, Hubei and Sichuan, and continues to spread westward and northward, killing more than 500 million pine trees, destroying 333,300 hm of forests and causing direct economic losses of hundreds of millions of yuan. The spread of PWD in China directly threatens the security of 33 million hm pine forests and key ecological areas in southern China
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