Small White Pieris rapae are considered a garden pest as they eat cabbage and tomatoes.
The caterpillars will eat your brassica as well as your tomato plants.
They are very well camourglaged and difficult to see.
They mainly come out under the safely of darkness to feed.
The caterpillars eat the leaves as well as the unripe tomatoes.
Photography Neil Bromhall. www.rightplants4me.co.uk