Major Species of Aphids and Their Seasonal Occurrence on Soybean in Chikugo

Two species of aphids, Aulacorthum solani and Aphis gossypii were observed as predominant species from May to June on soybean plants sown as a summer crop in April, 1980. The former was more abundant than the latter. Another species, Aphis glycines was more abundant than the other two species mentioned above from mid-August to early September on the fall crop sown in July, but among these species A. solani showed the highest population density in October. As an aphid on soybean in the Chugoku, Shikoku, and Kyushu districts, Aphis glycines has been cited,1,2,3,6 but this species has not been a serious threat. On the other hand, in northern Japan, the occurrence of several species of aphids is mentioned as well as that of Aphis glycines, but it was recorded that their populations were not large.4,5,7 The author observed the species that migrated to summer crop soybeans in 1980, while researching their propagation on summer crop soybean and fall crop soybean. Mainly Aulacorthum solani was observed propagating on summer crop soybeans, and even on fall crop soybeans the propagation of this species was conspicuous after mid-October. This is only one year’s research result, but it is reported for future reference.Originating text in Japanese.Citation: Inoue, Hirata. (1981). Major Species of Aphids and Their Seasonal Occurrence on Soybean in Chikugo. Proceedings of the Association for Plant Protection of Kyushu