Any gardening experts out there? As the title suggests we have crinum grubs attacking our hippiastrums. I have removed all the leaves that have been affected. How likely is it that they will come back? And is there a better way to get rid of them? I just cut the leaves off & threw them in the bin. Some of the leaves looked eaten but no longer had grubs on them so I'm guessing they have been there a while. Is it likely that they would have gotten into the bulbs?

TIA