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Recent studies (YUKAWA, 1980; YUKAWA et al., 1981) on the life history, host plant range and parasite complex of the Japanese Asphondylia species indicated the possibility that the soybean pod gall midge, Asphondylia sp. might be identical with some of those inhabiting wild hosts other than Leguminosae. To detect identical species in different hosts, host-change experiments from the wild plants to soybean in Asphondylia species were attempted in 1982 by using 2 x 2 x 2 m cages. Each cage covered 30 to 60 soybean plants to prevent females of the soybean pod gall midge from ovipositing naturally. The galls produced on such wild hosts as Ligustrum, Aucuba, Helwingia and Weigella were collected and placed in the cage in being separated from other hosts. Emergence, swarming and mating occurred normally under caged conditions in all the experiments, but the females that had mated flew upwards and rested on the ceiling of the cage throughout the night without showing any ovipositional activity. As a result, no infested pods could be recovered from the soybean cultivated in the cages. However, the possibility of host-change cannot be discarded since the same findings were recorded even in cages where pods infested with the soybean pod gall midge had been placed ("soybean to soybean experiments"). The "soybean to soybean experiments" tend to suggest that a pre-oviposition flight is necessary for the females that have mated to initiate an oviposition activity. Further experiments should be carried out in larger cages to provide ample room for the flight.
- 九州病害虫研究会の論文
九州病害虫研究会 | 論文
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