Tuinman, some help (from my HDRA* veg-growing bible), along the same lines as manicscousers and saddad... the note about winter digging could be timely, though. :)
"Pea moth lays its eggs when peas are in flower, so early and late sowings that flower outside the moth's flight period, from early to late summer, will escape damage.
Cover peas in flower during the flight period, especially in early July, with fine mesh.
Dig over plots where infested plants have grown thoroughly in winter. Pesticide spray: derris, as a last resort."
*the old name for Garden Organic, charity & research association
