Identifying Crown Changes in Pine Trees Artificially Inoculated with Bursaphelenchus xylophilus Using Ground Surveys and Aerial Photography.

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  • マツノザイセンチュウ接種木樹冠の地上調査および空中写真による追跡
  • マツノザイセンチュウ セッシュボク ジュカン ノ チジョウ チョウサ オヨビ クウチュウ シャシン ニ ヨル ツイセキ

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Abstract

To prevent an enlargement of the pine forest injury from pine wilt disease, it is necessary to survey and control the injured pine trees without any oversights because of their being infested with larvae of the Japanese pine sawyer, the transmitter of pathogenic nematodes. Now, we are investigating the development of techniques to identify the diseased trees by applying the advantage of aerial photography. For the observation of changes in crown color according to the progression of pine wilt disease using two types of aerial photography (natural-color and infrared-color) and a ground survey, thirty pine trees were artificially inoculated with pine wood nematode in June to August of 2006. Crown changes caused by the disease were pursued with a resolution of 12.5 cm for aerial photographs. Keys of individual identification were color and form of crown, and position from the on-the-ground mark assigned for each tree. In early autumn, some of the inoculated pine trees standing in a grassy area were difficult to identify, but all of the inoculated pine trees were identical in the middle of October 2006. Infrared-color aerial photography was slightly more sensitive than natural-color aerial photography for the eight crown stages in a ground survey, which served to indicate the degree of crown change caused by pine wilt disease.

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