Something is eating at my hostas! Could it be this insect? It’s mostly black with somewhat gold metallic-like markings. The hosta that this was found on did not have holes in the leaves but a few of my other hostas do have holes in them. I found another all black bug on them too. It’s looked almost like a small lightening bug but was entirely black. Could THAT be the bad bug?
The picture is of the Oriental beetle. The adult feeds on flowers such as daisies or roses, but do not cause much damage. The larva (white grubs)are the pest, having become the biggest turf pest in the northeast. The adult emerges late June/early July and lays eggs in grass. The eggs hatch into worms or better known as white grubs that feed on lawns. Do you have a problem with your lawn having brown patches or animals digging it up?
So, this is not a pest of your hosta. Not sure about the black beetle you mentioned without more information…please send a photo so I can help identify it.