This is so interesting - I've had root mealies kicking around in my collection for a couple years, definitely a tough pest to eliminate, happily on my end the plants seem to handle infestation fine as long as they're kept fed and healthy. I've tried to eliminate them a few times using hot water soaks ect. with varying success (pro tip - if you have an instant pot some of them have a sous-vide setting that can hold water at the correct temperature, much easier than doing it on the stove). I'm much less involved in the hobby than I used to be so I don't mind having infested plants as I'm not selling or trading anymore. I suspect root mealies are quite common in the plant trade as I find them quite hard to detect (especially in the root ball) until the infestation is very bad.
Anyways, glad to see there are biologicals available for them - I'll definitely give some of the mites and nematodes a try come spring. I've had really tremendous success using biologicals to eliminate thrips so will be curious to see if I can knock back or eliminate the root mealies with repeated doses.
