Asparagus beetle does not (directly) affect the roots. It feeds on the ferns.
In the Low Countries, we often grow asparagus differently: we make a sort of “raised beds” on top of the crowns, which allows to harvest white asparagus. Harvesting continues up to the summer solstice, after which new growth is allowed to form ferns and gather sufficient energy for next year’s growth.
Also, growth is highly temperature dependent. We grew asparagus in sandy soil, which warms up quickly in spring and allows growing straight instead of crooked plants.
A visual impression: https://www.youtube.com/watch?v=YdUlvXgzCQc