Small tortoiseshell Host Parasite Sturmia bella, thought to be non native, invasive

[PhilBJohnson]

Small tortoiseshell (ST) parasite, sturmia bella
Did Butterfly Conservation in South of England, get land owners permission (or licence) to habitat cage less common, communal colonies of ST caterpillars, of a size (or instar) that they got parasitised at and under controlled conditions, raise all of them, into either parasite, that might have been fed to a fish at chrysalis stage, but not released back in the wild,) or released as small tortoiseshell butterfly, that might not have hosted a parasite, in it’s butterfly, metamorphosis state?
It was thought that if this process was patiently carried out by BC members, more ST could be released to the wild, at the same location without parasite, which became part of a food chain and did not life cycle past that stage.
It was also thought that the transport of communal caterpillars that might host unseen parasites, could be (or was) outlawed, across County Lines.
# Surrey Butterfly Conservation #Habitat Cage Design
#Insitu Habitat Cage