Potential impact of Anoplophora glabripennnis on urban trees in USA
In USA, Anoplophora glabripennis (Coleoptera: Cerambycidae - EPPO A1 quarantine pest) has been introduced into the cities of New York and Chicago. As of June/July 2000, more than 4720 infected trees have been destroyed in New York, and more than 1390 trees in Chicago, for a total cost of more than 25 million USD. Studies have been made to assess the potential impact of the pest on urban trees in USA, in terms of tree mortality, canopy reduction and economic losses. Data was collected on the urban tree structure (tree species, number of trees, monetary value of trees) of 9 cities (Atlanta, Baltimore, Boston, Chicago, Jersey city, New York, Oakland, Philadelphia, Syracuse). Host preferences, rate and pattern of spread of A. glabripennis were taken into account. For cities studied, potential tree resources at risk ranged from 12 to 61% of the total city tree population, with an estimated value of 72 to 2300 million USD per city. The corresponding loss of canopy cover which would result, if all preferred trees were killed, ranged from 13 to 68 %. These data were then extrapolated at national level. It was estimated that the maximum impact (all areas becoming infested) was a loss of 34.9% of total canopy cover, 30.3% tree mortality (1,200 million trees) and economic loss of 669,000 million USD. It is acknowledged that these estimates have a significant degree of uncertainty due to lack of information, but as more data will be gathered better estimates will be provided.
Sources
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Nowak, D.J.; Pasek, J.E.; Sequeira, R.A.; Crane, D.E.; Mastro, V. (2001) Potential effect of Anoplophora glabripennis (Coleoptera: Cerambycidae) on urban trees in the United States.
Journal of Economic Entomology, 94(1), 116-122.
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