The method of pest risk analysis of urban greening and its application.
To find a uniform solution for evaluating the risk of urban greening pests, the idea of pest risk analysis (PRA) to urban greening ecosystem was introduced and a model for analysing the risk level of the pest was set up. Based on the rule of international standards for pest measurements (ISPM), mathematics theory and characteristics of the urban greening ecosystem, the criterion of evaluation and calculation measures of the model on the method of AHP and Delphi was discussed. Using this model, 16 insect species and 7 plant pathogens in Shanghai (China) greenbelt were evaluated. The result showed that the high risk level with the value from 0.6 to 0.8 involved 3 insect species (Zeuzera coffeae, Dasychira pudibunda [Calliteara pudibunda] and Micromelalopha troglodyta) and 4 plant pathogens (Cercospora sequoiae, Sphaeropsis sapinea, Glomerella cingulata and Colletotrichum gloeosporioides). The middle risk level with the value from 0.4 to 0.6 involved 9 insect species (Adoxophyes orana, Cyrtotrachelus longimanus, Coccus hesperidum, Ricania sublimbata [Ricanula sublimata], Chrysomela populi, Obera matangensis, Trioza camphorae, Laphygma [Spodoptera] sp. and Eriophyes dispar) and 3 plant pathogens (Melampsora rostrupii, Ustilago striiformis and Phaeoseptoria eucalypti). The low risk level with the value from 0.2 to 0.4 involved 4 pest species (Aceria osmanthis, Parthenolecanium corni, Archips oporanus and Aspidiotus destructor). Finally, the strategy of the risk management for these pests was discussed.