I have been battling with club root in the veggie garden for some time. Can you tell me if there is a product that can be applied to roots before planting?

In the past there was. However, as people have trended towards greener and more organic gardening a lot of these types of fungicides have been taken off the market. Your best bet would be to ask at your local garden centre if they stock this type of product. My advice would be to rotate your crops more often and try adding some lime to the soil before you plant.