To take part you need to: Avoid touching the pupa and don't pick it off its leaf or stem. Instead, cut off the leaf or plant stem. Back indoors, trim the plant cutting to about 2cm in size.

pupa or eggs. Harlequins were introduced into mainland Europe from Asia, to control plant pests. They appeared in Britain in 2004, and seem able to thrive here, possibly outcompeting some native ...