Assertion: gypsy moth's introduction | /r/HasAspect | great impact
Facets:
value: on brown-tail moths
type: TRANSITIVE-OBJECT
Source sentences:
text: While not entirely successful for that purpose, one research group concluded that introduction of this fly had a great impact on brown-tail moths while not being as effective on gypsy moths, the reason being that the fly larvae need to over-winter inside a host larvae.