A guava plant with its first harvest, and at the same time, I have some questions that I hope you can help me understand

There are curiosities that nature offers us daily, which we sometimes overlook, but they are so incredible that they only occur in certain places. That being said, in my grandmother's backyard there's a guava tree, relatively young, growing among a few others. I remember when it was smaller, people said to cut it down because, supposedly, due to that detail I mentioned earlier, it wouldn't thrive. But my grandmother always believed it would bear fruit, and although she didn't live to see it (she passed away a few years ago), she was right not to get rid of the tree.

Although there are only a few fruits now, the first ones are appearing on the tree. I honestly don't know how long it will take for them to be ready to eat, although I must add that I personally prefer them when they're not fully ripe, to enjoy them as is. But there are other ways to enjoy them, for example, in juices.

As I mentioned in the first lines of this post, this plant has a curious feature, especially on its main trunk: the skin or bark that covers it lifts up. I can't imagine why, but that's what I'd like to know. If any fellow Hiver gardeners know the answer, I could share it in the comments so that others who have the same question can find out. It's certainly striking, as it's the only plant that has this ability to grow new skin after shedding the old one.

To conclude my brief contribution here in the #hivegarden community, I also noticed that some branches of my guava plant have a kind of pest that damages it, causing it to dry out little by little. As you can see in the photos, it could eventually damage the entire plant, as it spreads from the branches to the main trunk. I even think it could harm the future harvest. If anyone knows of a remedy to get rid of this pest, it would be very helpful. Greetings and blessings, and may we have a successful weekend that allows us to get closer to achieving the goals we set for ourselves.