Sure death for Japanese beetles. After pinching these pests by hand (both/without cloves) last year I’ve found a solution. A pair of 1” blocks, approx. 2.5” x 2.5” have found a place at my grapevines. I’ve killed many beetles by approaching a leaf without moving it and suddenly clapping the blocks together (1 in right hand, 1 in left hand) with hopefully minimal leaf damage. (I knock the remains off the leaf.) Hopefully the smell of dead comrades is better than commercial traps which, as I read, attract beetles.
– eab, 7/17/17