Subject: Need to identify this bug please
Location: Reading, UK
July 28, 2015 4:04 am
I have them on my nasturtium and I suspected they hatched from yellow eggs.
The easiest way to identify an unknown caterpillar is to know the food plant and the location, both of which you provided for us. We quickly found the answer to be Caterpillars of the Large White, Pieris brassicae, and the Hortographical site has an excellent posting on these Large White Caterpillars.