Posted: 27/03/2017 at 08:55
The grubs do less damage in the garden than they do in pots. They eat in a straight line so do not normally completely remove all the roots from one plant. In a pot they are forced to go round and round consuming all the roots.
The grubs themselves do not migrate from one pot to another.
The all female adults do wander about like any other insect, looking for food and egg laying places.
They lay their eggs at the base of a plant stem on the soil and the tiny grubs then burrow downwards. They will not lay their eggs if they cannot reach soil with their ovipositor (egg laying tube). On single stemmed plants you may be able to prevent this by putting a 2 inch deep layer of small gravel or grit on the plant pot surface.
Hope this helps.