That's nasty!! You need put a warning in the title!
Hopefully the guys who commercially farm have some solutions but I have encountered grubs in my lawn. I knocked them out with a product called Bayer 24 Hour (Trichlorfan) after infestation the first year. This year I tried to get ahead of the game and used a product called Lesco Bandit (Imidacloprid). I had good results with both. Sevin (Carbaryl) is suppose to be pretty effective also but I couldn't find it in granular form for application.
My understanding is that you need for the pesticide to get below the surface where the grubs are active and not a surface pesticide. Imidacloprid can effects bees (kills/interferes with reproduction) so it shouldn't be used prior to time of flowering so probably not a good one for bananas although pretty good on St. Augustine grass.
Here are a couple articles that I used:
How to choose and when to apply grub control products for your lawn | MSU Extension
https://ag.umass.edu/turf/fact-sheet...e-grub-control