More efficient way to gather ripened mushrooms?

I am having my progress stone-walled by a seemingly simple quest to gather 5 ripened mushrooms.

I understand that to get them I need to beat it out of the bugs carrying them but there simply don't appear to be enough of them actually carrying mushrooms to gather enough.

Is there some other way to gather them that I am missing or am I just having abysmal luck on the spawns?