Will the grass come back? My sources experience is with Bermuda and Bermuda comes back from almost anything.
The Arbico source took a little explaining on the phone and some discussions with someone a little further up the food chain at Arbico. I feel pretty comfortable that their nematodes applied at the right time would kill the new pearls. I am less confident about their effect on the older hard shelled pearls but I also don't know how long they live so maybe the old ones die off after a season.
I am glad we are discussing something new and of some use rather than which mower is best. Thanks for the great feed back.