A trial of a number of substances as repellents against the Narcissus fly (Merodon equestris) was made at Victoria, B.C., in 1933. The place selected for these trials was one where the owner had suffered severe losses from Merodon in the past, and notwithstanding this had preserved all his badly infested bulbs instead of destroying them as we advised; and further, had even planted them in a separate plot to see if they would recover. The result of this procedure was, as we predicted, a11 enormous infestation of Merodon the following summer and anticipating this we made arrangements to try out various repellents, realizing that here was an unusual opportunity.