Study On Remote Sensing Technology For Colorado Potato Beetle Monitoring

In the paper, the canopy spectral characteristics of potatoes damaged by Colorado potato beetle were analyzed; The area of damaged potatoes was extracted and the appropriate temperature and host of the potato beetle were retrieved around China. The important results are listed as follows:1. The canopy spectrum of damaged potatoes in the field was collected using ASD FieldSpec HandHeld at the Natural Enemy Breeding Center of the Institute of Plant Protection in Xinjiang Academy of Agricultural Sciences in 2008 and 2009. The results showed that the canopy spectral reflectance of damaged potatoes was characterized by the"green peak","red valley","infrared high bench", being significantly lower than that of healthy plants within the range of 750.0 to 935.0 nm. The infrared spectral reflectance decreased with the increase in damage. Using derivative spectrum technique, the result suggested red edge slopes decreased while the position remained unchanged. In addition, sensitive wave bands were found between 736.0 to 920.0 nm.2. The information on the damage to the potatoes in Yili experimental field in Xinjiang(81°11′E, 43°50′N)was retrieved by QuickBird image, and the canopy spectral reflectance was also measured in the field. Compared with the potato canopy spectral reflectance of different degrees of damage, the infrared spectral reflectance decreased obviously as damage increased.The position of the red edge was 720.0 nm. By"K-means"method, the QuickBird image was classified into three kinds: the healthy potato field, the damaged field and others. The results showed that the area of damaged potato was 1296 m~2, the healthy area was 1474.56 m~2, and rest was 950.40 m~2. Investigation of the field revealed that the damaged area was 939.00 m~2, the healthy area was 2246.00 m~2 and rest was 565.00 m~2. By precision test, the total precision was 76.27 %, and kappa coefficient was 0.5024.3. The appropriate temperature and host of the potato beetle were analyzed around China using MODIS temperature and Vegetations Index image. The results showed that Colorado potato beetle can survive in most areas of north, central and east China. Especially, it can live in Balikun and Hami in Xinjiang because of suitable temperature and host, as there is the most possible route between the east of Hami to Hexi Corridor of Gansu along which the beetle can invade the inland of China.