Discovery of a Spotted Alfalfa-Like Aphid, <i>Therioaphis trifolii</i> (MONELL) s. lat., in Japan

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  • アルファルファアブラムシの日本からの発見
  • アルファルファアブラムシ ノ ニホン カラ ノ ハッケン

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Abstract

Populations of Therioaphis trifolii (MONELL) s. lat., which includes the spotted alfalfa and yellow clover aphids which are serious pests of alfalfa and clover were found on Medicago lupulina, M. denticulata and M. sativa (alfalfa) in Yamaguchi Pref., Japan in 1980 and 1981. Some specimens collected from Medicago sp. in Fukuoka City in 1944 also became available. Further surveys made near Fukuoka City in 1981 revealed the aphid on M. denticulata also. The Japanese specimens are briefly compared with the forms known from other parts of the world. The life history of the species in temperate Japan is not yet known. However, a life cycle in which the aphid reproduces parthenogenetically the year around as in warm climates is not likely. In temperate Japan, oviparous females and males may appear in the fall on unknown plant other than Medicago and give rise to overwintering eggs, or winged aphids may migrate every year from southern warmer areas. The distribution range, occurrence and likely future spread in Japan are also discussed.

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