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Laboratory tests of the effects of p‐cresol and 4‐methylcyclohexanol on oviposition by three species of Toxorhynchites mosquitoes

ABSTRACT. Laboratory experiments tested the effects of p‐cresol or 4‐methylcyclohexanol at concentrations of 1,10 and 50 ppm, on oviposition by the mosquitoes Toxorhynchites brevipalpis Theobald, Tx. amboinensis (Doleschall) and Tx. splendens (Wiedemann). A 5+5 ppm mixture of the two chemicals was also tested. All three species laid significantly more eggs in cups containing p‐cresol, whereas only Tx. brevipalpis and Tx. amboinensis responded similarly to 4‐methylcycohexonol and to the mixture of both chemicals. Tx. brevipalpis was, to a relatively limited degree, the most responsive of the three species. Ancillary experiments indicated that the chemicals were acting as attractants, causing more females to fly to treated cups. No stimulant effects were detected either in terms of the proportion of females that initiated oviposition flight (after flying to the cups) or in terms of the number of looping flights executed prior to ejection of an egg.