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We present accurate UBVRI photometric comparison sequences around 20symbiotic stars. The sequences extend over wide brightness and color ranges,and are suited to cover quiescence as well as outburst phases. The sequencesare intended to assist both present time photometry as well as measurement ofphotographic plates from historical archives. The types of variabilitypresented by symbiotic stars are reviewed. Individual notes on the knownphotometric behaviour of the program stars are provided.Comment: in press in Astron.Astrophys.Supp

$UBV(RI)_{\rm C}$ photometric comparison sequences for symbiotic stars