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The control measures would need to be applied each year. The larger land owners would have to pay the bulk of the bill.
If it can be impressed upon the larger land owners that the grubs cost them more money than the treatment, then they might buy in.
I am going to try and make lemonade out of the lemons on this one.
Scarabs are dung beetles. Shy of being the typical dung beetle rolling a ball around, Japanese Beetle larvae still need a "dung" source to feed on which is generally in the form of some sort of thatch layer in the soil profile. Perhaps they play a beneficial role in the soil profile for pastures? I don't think there is much for a thatch layer in conventional field crop cultivation.