Risk Assessment of Citrus Huanglongbing with the Support of Remote Sensing Technology
Predicting the risk of citrus Huanglongbing(HLB)is an effective measure to control the spread of the disease.In order to achieve precise monitoring and prevention of HLB in a large area,a comprehensive multi-indicator HLB risk assessment at the plot scale was carried out.Taking the citrus plot in Xinxu Town,Mengshan County,Guangxi as the object,based on multi-temporal NDVI(normalized difference vegetation index),LSWI(land surface water index)and MTCI(MERIS terrestrial chlorophyll index)remote sensing indicators,a citrus HLB monitoring model was established to obtain HLB-affected plots.Comprehensive migration distance,slope,citrus growth,elevation and average temperature indicators were used to calculate the weight of indicators using the analytic hierarchy process method,and the comprehensive model for evaluating the risk of citrus HLB infection was constructed to assess the risk level of citrus plots infected with HLB.The results showed that the accuracy rate of the citrus HLB monitoring model was 80.31%,and the leakage rate was 10.53%,which effectively reduced the field investigation of citrus HLB.The weights of migration distance,slope,citrus growth,elevation and average temperature were 0.404,0.289,0.186,0.120 and 0.086,respectively.The ability of migration and diffusion of psyllid was the dominant factor in the spread of the disease.The high-risk area of HLB infection in Xinxu Town was 475.93 ha,the medium-risk area was 552.00 ha,and the low-risk area was 1 188.87 ha,accounting for 21.47%,24.90%,and 53.63%of the citrus area,respectively.The risk of further spread of HLB infection is high,and it is suggested that the relevant departments should strengthen the prevention and control of high-risk areas to prevent the spread of the disease.
万方数据
维普
