I use a thin piece of hardwood, sanded on one end to make a slightly rounded edge, and tease apart the
roots to avoid tearing as much as possible. My son and I made several of these "seedling spudgers" over lockdown as gifts for our current crop of
PDC students. We grabbed a nice looking piece of acacia from the
firewood pile, split it on the
kindling cracker, sanded them and drilled the ends. I like tying a loop of cord on them to make them harder to lose amidst the potting soil and containers when I work.