test with grasshoppers on nettle was Urtica dioica (stingingnettle) the plant that evolution created as a reaction to humanity?
Nettles are the preferred food plant for some sorts of caterpillars,
including those of the Question Mark butterfly.
M. Reed
An interesting test would be to see if any caterpillers would remain
on the stems or leaves.
Archimedes Plutonium
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