I have two hives - one with a new queen from March and one with a queen from May of last year. Until a month or two ago, the hive with the older queen was really kicking butt while the one with the new queen was slow. Lately, the one with the older queen has been slowly dwindling. I just checked yesterday and there were only two frames with a small amount of capped brood on them (I did locate her btw - shes definitely there) and it seems that the number of bees in the hive is slowly decreasing. Now, it is the hottest part of the summer here in Texas - it is VERY hot and dry...but the other hive with the younger queen seems to be doing ok. Its not expanding quickly but there are a good amount of frames with good brood patterns. Does this mean I should requeen? Or might there be another culprit? If i do requeen, will early september be a reasonable time to do this?
Thanks for your input!!