Companion planting.

[hopalong]

Perhaps try some African marigolds?

Yes, worth trying African.... and Aztec, Cape as well as French and Pot.  Friends tell me that the French ones are definitely good for confusing insect pests, but maybe you have to brush up against them to release the smell.  Oil from the roots also poisons harmful eelworms.

[hopalong]

[tonybloke]

Yes, worth trying African.... and Aztec, Cape as well as French and Pot.  Friends tell me that the French ones are definitely good for confusing insect pests, but maybe you have to brush up against them to release the smell.  Oil from the roots also poisons harmful eelworms.
[/quote]
plant tagetes on path edges, so they overflow onto paths, then as you walk around the plot, you brush them with your feet, releasing the scent from the leaves  ;)