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A short‐term dye for marking eastern subterranean termites (Reticulitermes flavipes Koll.) (Isoptera, Rhinotermitidae)

The dye Sudan Blue 35 was evaluated as a material for labelling eastern subterranean termites, Reticulitermes flavipes, in foraging and behavioural studies. Termite workers were fed filter paper containing dye concentrations of 0.5, 1, 2, 4, 6, and 8% for periods of 5–15 days. Concentrations greater than 2 % deterred feeding, which resulted in less effective labelling, and elicited significant mortality. In contrast to previous results with the dye marker Sudan Red 7B, very few termites retained the dye 15 days after feeding, independent of the original dye concentration. 80% of R. flavipes workers fed 1 % dye for 10 days were still visibly labelled 5 days after feeding, with this proportion decreasing to 13 % after 10 days. As an alternative to other dye markers, Sudan Blue 35 would be suitable for field studies with R. flavipes employing mark‐release‐recapture cycles of 5–6 days, or for labelling termites in laboratory studies of behavioural interactions or feeding preferences.