World English Dictionary
blackfly (ˈblækˌflaɪ)
n , pl -flies
Also called: bean aphid a black aphid, Aphis fabae, that infests beans, sugar beet, and other plants

Collins English Dictionary - Complete & Unabridged 10th Edition
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1. blackish aphid that infests e.g. beans and sugar beets 
2. small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals 
WordNet® 3.0, © 2006 by Princeton University.
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