Doese this beatle have a long "snout"? If it doese it's a weavle. Black Vine Weavles have a notched chewing pattern like that and they eat a lot of different plants. Good luck!

Yes, they are mealy bugs. The first step is definitely to quarantine any affected plants. Make sure you really check all your plants, not just the ones where they are readily visible, because they can be expert hiders. Leaf or surface mealy bugs are different from root mealy bugs, but it is possible to have both. I would try pulling up a plant or two to check; if you don't see anything, you probably only have the surface bugs. Treatment can be a bit of a pain, but you can find lots of information on what solution to use on the forum. I have used a 50/50 water/alcohol mix with a squirt of dish soap, and I'm currently experimenting with Safer's Insecticidal Soap. So far it seems to be working well. Definitely make sure you spray and/or remove what you see, but I always like to spray the whole plant in case there are things I can't see going on. Because soaps and pesticides often work on certain, but not all, parts of the life cycle, you will have to do several treatments. The life cycle is around 3 weeks. I like to spray once every few days (spraying every day seems too hard on the plant, in my experience). Then, be sure to keep your plants quarantined for a few more weeks to be sure all the bugs are gone before you put them back with the rest of your collection. Good luck!

Your local climate is much different from mine. And also, I don't grow my plants indoors since I am lucky enough to have good weather all year long for my succulents here in SW Florida. But I'll give you my experience with this plant. It rots easily! Now I do have humid and in the summer, wet weather. This is not what you have. I am on my 3rd Campfire plant. Here is a picture of my first rotting plant. Notice how rich and dark the soil is! It retained too much water.Out of all of those stems and rosettes, I got only 2 tiny plants to root and grow. Almost all of what you see had rot and the stems were still pretty rigid, not limp at all. So this can be deceiving. Here's a closeup - every stem and rosette that I cut was slimy and falling apart. This happened rather quickly, by the way, in spite of being in full sun. I strongly encourage you to at least use 50% perlite with your soil. That was not enough for my wet conditions, but it works well for many people. I now have my newest plant in the full gritty mix and things are going well - - - but I am keeping a close eye on things this year. Good luck! This is one of my favorite plants. So colorful!

I’ve killed more succulents than I’d like to admit. Hundreds of dollars rotted or burnt to a crisp. Nonetheless, I am happy to report that I had maybe one loss this past year? I’ve learned to ignore the overall rules and adapt to what works for my succulents in my environment. I started out with succulents by ordering about $200 worth of sempervivums “hens and chicks”. For starters, they advertised echeverias on their pictures but I didn’t know the difference at the time. All I knew is that I loved the look and that nothing would grow on the south side of my house because of the intense heat. My semps came with instructions hardy to zone 9, plant in full sun. I lovingly did so along with two trays of sedum and they did very well for maybe two months until we started getting heat waves in May. It only took one day for them to burn to the point where they almost fell apart. And that was my first massacre. I finally learned to trust my gut after visiting my aunt who waters her succulents every two days, keeps them in part shade, doesn’t protect them from frost or heat and I realized she broke every single rule yet had the biggest most gorgeous succulents I had ever seen. So with time, I’ve learned what works and what doesn’t and I feel more confident in buying the more expensive succulents because mostly everything stays alive now. The one piece of advice that has always worked for me and I think it works for almost anyone is if you have any doubts on whether to water or not, then don’t water. It’s easier to kill from overwatering than underwatering. but anyway, sorry for the rambling. I kinda just wanted to say don’t give up and don’t be afraid to fail a few times.