If you have uncapped larvae, then you had a queen at least within the last 10 days. Did you see any eggs? A picture of the brood would be helpful.
Either way, it's odd to have such a small patch of brood. Three possibilities I can think of are:
1. Your queen swarmed and there is a virgin
2. There is no queen, virgin or otherwise
3. There is a queen, but she has no space to lay eggs! The problem with this third possibility is that normally bees will leave more space for brood than half a frame, but who knows??
You could try putting an empty frame next to the brood and see what happens. If it were my hive and there wasn't a virgin I would requeen. I'm interested in hearing what others think.
Either way, it's odd to have such a small patch of brood. Three possibilities I can think of are:
1. Your queen swarmed and there is a virgin
2. There is no queen, virgin or otherwise
3. There is a queen, but she has no space to lay eggs! The problem with this third possibility is that normally bees will leave more space for brood than half a frame, but who knows??
You could try putting an empty frame next to the brood and see what happens. If it were my hive and there wasn't a virgin I would requeen. I'm interested in hearing what others think.