Homozygous adults and larvae show a reduced response to benzaldehyde, formaldehyde and salicylaldehyde in an olfactory test at 28^oC, but show normal responses to ethyl acetate, acetone, acetic acid and ethanol at this temperature. Viability and fertility of adults is normal at 28^oC.

Similar phenotype to olfA (Rodrigues, 1980), but subnormal responses of larvae or adults to aldehydes <up>benzaldehyde and formaldehyde plus salicilaldehyde as well (Ayyub et al., 1990)</up> seen only after rearing at 28^oC (permissive temperature in these tests -- first performed by Rodrigues, 1980; extended by Ayyub et al., 1990 -- was 22^oC). Larvae and adults grown at non-permissive temperature normal in responses to ethyl acetate, acetic acid, ethanol and acetone (Ayyub et al., 1990). Physiological responses of antennae to aldehydes briefly noted to be normal by Siddiqi (1984).