noun, plural green·flies.
an aphid, Coloradoa rufomaculata, that is an important pest of chrysanthemums.
Origin of greenfly
Also called pale chrysanthemum aphid.
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noun plural -flies
a greenish aphid commonly occurring as a pest on garden and crop plants
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012