ABSTRACT
In the early part of the twentieth century, the first pesticide-resistant arthropod species, the San Jose scale, Quadraspidiotus perniciosus (Comstock), was discovered to be resistant to lime sulfur in deciduous fruits in the state ofWashington [1]. By the year 2000, there were 533 arthropod species reported to be resistant to one or more pesticides. Our work updates that of Georghiou and LagunesTejeda [2], whose widely reported tabulation of 504 species exhibited an increase in pesticide resistance of just over 6% in 10 years. This count is based upon an examination of over 2600 peer-reviewed journal articles, which supplements the 1263 references cited in previous reviews of Georghiou and others (Table 1). Our information currently resides in an electronic database at the Michigan State University Center for Integrated Plant Systems that is available via the Internet at http:/ /www.cips.msu.edu/resistance.
