豆蚜

[ noun ]
blackish aphid that infests e.g. beans and sugar beets
<noun.animal>

black fly \black fly\, blackfly \blackfly\, (Zo["o]l.)
1. In the United States, a small, venomous, two-winged fly of
the genus {Simulium} of several species, exceedingly
abundant and troublesome in the northern forests; --
called also {buffalo gnat}. The larv[ae] are aquatic. It
sucks the blood of birds as well as humans and other
mammals.
[WordNet 1.5 + WordNet 1.5]

2. A black plant louse, as the bean aphis ({Aphis fab[ae]}),
which infests e. g. beans and sugar beets; -- called also
{bean aphid}.
[WordNet 1.5]