Japanese beetles- best way to get rid of them?
I don't know whether Japanese Beetles (these green, jewel-looking beetels with pincher-like feet) are mostly just a native nusiance to where I live, but even so I'm wondering what other people have done to get rid of them in the past. ?
A simple, temporary solution seems to be simply tapping the flower in which they inhabit hard enough that they get scared and fly away, but the next day they're always back (it's easy to look after them as, after all, I only have aroud three bigger flower pots, lol). So my question is, how much damage could these insects do within, say, overnight, or in a day? What's the best method of keeping them off more or less completely? And, what if I were to try and remove them as far away from the flowers as possible (it's likely that when I spook them, they simply lie in wait until I'm not present anymore and jump back into the marigold heads). Also, I've read that their larvae feed on grass roots- what about other plants??
Thanks for reading the ramble! ;) V
(Also juuust in case other people don't know this beetle- I'm thinking they probably do but I'm not totally sure- there's a link there, too.)
Here is a link that might be useful: Beetle on Wiki