Some Taxonomical and Biological Observations of the Aphids caught on the Vegetables in Autumn Season

The aphids are well known as the important vector of the vegetable virus diseases in Japan. The authors have observed the taxonomical and biological aspects of the aphids caught on some vegetables and in the yellow pan traps placed ground level of 50 cm. The results are as follows. 1. The aphids caught on each vegetable were, 663 aphids in 25 specues on the chinese cabbage, 479 aphids in 24 species on the raddish, and 294 aphids in 28 species on the spinach. It seems that many species of aphids collected are related to the surrounding vegetation in this experimental field. 2. The aphids caught in the yellow pan trap were 1,100 aphids in 52 species, and 42% of the trapped aphids were Spinaea aphids, Aphis spiraecola. 3. It was found that many species alight on vegetables in spite of non-host plants of its aphids. 4. The abundance of the many species recorded in the present observations probably represent the autumn migration of aphids to overwintering host plants...