is of particular interest to those developing
quality control methods. Insight into the
variability and predictability of natural-
enemy behaviour will lead to adequate and
realistic tests to evaluate foraging behaviour.
Acknowledgements
This chapter is the result of a cooperative
programme between the Insect Biology and
Population Management Research Labor-
atory (US Department of Agriculture
(USDA), Tifton, USA), the Insect Attract-
ants, Basic Biology and Behaviour Research
Laboratory (USDA, Gainesville, USA), and
the Laboratory of Entomology, Wageningen
University (Wageningen, The Netherlands).
The Journal of Insect Behavior (Kluwer
Academic/Plenum Publishers) granted
permission to reprint an edited version of
the original Vet et al. (1990) paper with the
same title and authors. Editing was made
particularly easy with the recent extensive
critical review of the 1990 paper by Steidle
and Van Loon (2002).36 L.E.M. Vet et al.
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