Simulating spatial spread of Diaphorina citri based on a multi-agents modelling approach
Citrus Huanglongbing(HLB)is one of the most harmful diseases of citrus industry in China,and Diaphorina citri is the only natural transmission agent of citrus HLB.Therefore,understanding the occur-rence and spatial distribution regulation of D.citri is critical for the prevention and control of citrus HLB.A simulation model of spatial spread of D.citri was established based on the NetLogo platform,and the spatial spread regulation of D.citri and the efficiency of different field managements was evaluated in Mengshan County of Guangxi Zhuang Autonomous Region.The results showed that both the dispersal distance of D.citri and the frequency of pesticide spraying would greatly affect the spread of D.citri.The ratio of the total area at risk of D.citri infestation to the citrus orchard area increased continuously and rapidly if without any control,and the situation would be worse by long-distance dispersal of D.citri(wind speed≥5 m/s).On the contrary,the spreading risk of D.citri could be rapidly and efficiently controlled under the scenario of monthly pesticide spraying.The model validation results showed that the average TSS value of this model reached 0.82,and the sensitivity,specificity,and overall accuracy of the model was 85.2％,80.9％,and 83.3％,respectively,indicating that the model is able to simulate the spatial spread of citrus psyllids in the study area with good performance.This study suggests rational optimization of spatial layout of orchard in cit-rus planting areas,such as adopting a chessboard distribution,setting up physical barriers such as windbreak forest or insect nets between regions,strictly following the regulations for the use of efficient pesticides in the field for effective control of citrus psyllids to efficiently slowdown the spread speed and spatial range of citrus psyllids,providing supports for the regional control of citrus Huanglongbing.
NETL
NSTL
万方数据
