Acknowledgements
European and North American producers of
natural enemies are thanked for cooperation
in the design and testing of quality control
guidelines. Development of quality control
guidelines was financially supported by the
Commission of the European Communities,
Directorate General for Agriculture,
Concerted Action CT93–1076 ‘Designing and
Implementing Quality Control of Beneficial
Insects: Towards More Reliable Biological
Pest Control’. It does not necessarily reflect
its views and in no way anticipates the com-
mission’s future policy in this area. F. Bigler
and CAB International gave permission for
reproduction of Fig. 19.1 and the correspond-
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