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The assessment of the economic losses caused by Bactrocera dorsalis,B. cucurbitae and B. tau to Guangdong province

Ma Xingli1,Li Zhihong1,Hu Xuenan2,Wu Jiajiao2(1.Department of Entomology,College of Agriculture and Biotechnology,China Agricultural University,Beijing 100193,China;2.Guangdong Entry-Exit Inspection and Quarantine Bureau)  
Bactrocera dorsalis,B.cucurbitae and B.tau are regarded as worldwide important quarantine insect pests of fruits and vegetables.At present,these three species of fruit flies have invaded southern China and are causing serious harm in Guangdong province.In this paper,an assessment model of economic loss caused by fruit flies was constructed on the bases of combining the occurrence and damage characteristics of fruit flies and the components of economic losses.This model was used to assess the annually economic losses caused by the above three fruit flies in Guangdong province.The results show that under fruit flies infestation rates from 5% to 20%,the total value of economic loss was estimated to be from 3.367 billion Yuan to 12.987 billion Yuan,this included 2.332~11.078 billion Yuan of direct economic loss,0.351~1.226 billion Yuan of indirect economic loss,and 0.684 billion Yuan of prevention and treatment costs.
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