That is one of my arch enemies a click beetle. The worse part of this beetle are its larvae. I believe they are called wireworms. Twice a year the beetles deposit their eggs in the soil by your plant roots. The wetter the soil the happier they are. I have in the past lost several ornamental grasses to wireworms and a few small newly planted roses. Newly planted perennials have been slaughtered as well. I hate them kill it. They will do serious damage to veggie gardens. The wireworm can survive underground feeding on the roots of your plants for an eternity. Basically morphing once again into an adult to mate. While plant death does not happen often should you dig up a dead young plant look for wireworms. I have found as many as twenty in the hole with a new plant as they are attracted to the loose moist soil. They are considered a serious agricultural pest in some areas. To think that I used to consider them benignly cute them I learned the truth.Wireworms - Missouri Botanical Garden

Not sure, but I had what I called white needle pests on my cast iron plant some time ago. I believe that they were larva of mealie bugs. Not saying what your pest is, just relating an experience with my plants. I would repot your plant with clean soil and make sure you take all the precautions possible- wash the pot and saucer, clean the area around the plant, isolate the plant. I often will spray the roots with insecticidal soap if I suspect critters were in the soil.

It's a beetle, which narrows it down to thousands of species - try looking for references to the insects of a geographical area you fall within, then seeing what beetles they show as being in that area. I get the same general type appearing seasonally in my area also - it is probably discussed frequently once you find the right sources.

I apologise Diane you had asked me previous as to whether my rose has gotten any damage, and I didn't reply. Frankly nothing visable I see. Just a healthy, somewhat handsome plant. This is now my third year with this rose, David Austins Benjamin Britten, and by now it would have lost plenty of foliage from blackspot, this year its looking great no blackspot and consistant blooms. Yet its un-nerving to be picking off lanternflys everytime I go see it. They don't go on the leaves they just grip the canes. I'm on the 3rd floor, and the flys are coming from the trees on the walking path. Before they could fly, they would get blown by the wind, or jump from the trees; land on the balcony and walk to get on the rose. Now that they can fly I see them fluttering from the trees sometimes landing straight on the rose.