greenfly

[green-flahy] /ˈgrinˌflaɪ/
noun, plural greenflies.
1.
an aphid, Coloradoa rufomaculata, that is an important pest of chrysanthemums.
Also called pale chrysanthemum aphid.
Origin
1680-90; green + fly2
British Dictionary definitions for greenfly

greenfly

/ˈɡriːnˌflaɪ/
noun (pl) -flies
1.
a greenish aphid commonly occurring as a pest on garden and crop plants