Effect of eradication of the Oriental fruit fly, Bactrocera dorsalis, on the population density of the melon fly, Bactrocera cucurbitae, in the Ryukyu Archipelago, estimated from the number of male flies captured by attractant traps

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The effect of eradication of the Oriental Fruit Fly, Bactrocera dorsalis, on the density of the Melon Fly, Bactrocera cucurbitae, was examined using data for the numbers of flies caught by monitor traps on islands and island groups of the Ryukyu Archipelago. A positive correlation was found between annual mean densities of B. cucurbitae and the number of years after eradication of B. dorsalis in three of four localities. Thus the density of B. cucurbitae seems to increase after eradication of B. dorsalis. This result suggests the possible effect of interspecific competition on islands where the two species coexist, but the effect is considered to be not very great. The density of B. dorsalis after eradication of B. cucurbitae seems to be not so different from the density on other islands where B. cucurbitae still exists. Attempts to eradicate a single species from localities where B. cucurbitae and B. dorsalis coexist can be planned, with careful examination of the density of a different species, as we did in the Ryukyu Archipelago.
2005-11-25