Assertion: spot ladybird | /r/AtLocation | north america
Facets:
value: to control aphid populations
type: PURPOSE
value: in the mid-1900s
type: TEMPORAL
Source sentences:
text: Seven-spot ladybirds are native to Europe but were introduced to North America in the mid-1900s to control aphid populations.
text: Seven-spot ladybirds are native to Europe but were introduced to North America in the mid-1900s to control aphid populations.