I think my shallots are rotting from being too wet. I did find a small worm in one but not sure if this is the cause or just an effect of the bulbs breaking down. I must be over watering them and the soil seems to not be draining as well as I would like. The compost I got from the horse farm is still quite coarse and seems to be holding water. Yellow tips on alliums can imply over watering. Below top are the plants I pulled with brown withered leaves; bottom shows yellow tips on remaining plants.