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Additional info for Biological Control: Measures of Success
1997), Fear no weevil? Science, 227, 1058-1059. L. (1936), The Biological Control ofInsects with a Chapter on Weed Control. Comstock, Ithaca. B. K. (1996), Integration ofBiological Control and Host-Plant Resistance Breeding. A Scientific and Literature Review, Technical Centre for Agricultural and Rural Co-operation, Wageningen, The Netherlands. B. J. (1998), Biocontrol- risky but necessary? Trends in Ecology and Evolution, 13,325-329. , Langewald, J. N. (1996), Evaluating the effects ofa biopesticide on populations of the variegated grasshopper, Zonocerus variegatus, Journal ofApplied Ecology, 33,1509-1516.
Hall, R. W. E. (1979), Rate of establishment of natural enemies in classical biological control, Bulletin ofthe Entomological Society ofAmerica, 25, 280-282. Hanski, I. (1991), The functional response of predators: worries about scale, Trends in Ecology and Evolution, 6,141-142. Harris, P. (1990), Environmental impact of introduced biological control agents, in Critical Issues in Biological Control, eds. M. E. Ehler and J. Roland, Intercept, Andover, UK, pp. 289-300. P. (1978), The Dynamics ofArthropod Predator-Prey Systems, Princeton University Press, Princeton, New Jersey.
This approach may sometimes pose risks because natural enemy importations made in such projects may receive less public scrutiny. The importance of this concern depends on how the review process is organised in a particular country. It is of greater importance for importation of agents of arthropod biological control than of weed biological control because a more rigorous host range estimation process is often required for the importation of the latter. Local projects may also suffer by having a narrower financial base.