Cover crops are planted to provide a benefit to the field (e.g. improved soil health, or reduction of pests & diseases) without the expectation of harvesting the crop at the end of the season. 

It is though that the chemicals produced by oil radish can reduce PCN populations in the soil. Neill Smith at barnyards has been planting Bento oil radish on his land for multiple rotations.

Field trials are being conducted in 2024 to assess which oil radish varieties reduce PCN populations.