When I didnít wrap I lost more hives. I think the advantage of wrapping is three fold. One is serves as a wind break and two it allows for solar gain on sunny days and allows the bees to break or loosen their cluster and relocate in contact with stored food. And last it allows for more cleansing flights and reduces nosema problem.
I know that the debate over wrapping has valid points on both views. But bees flying out of the hive and not returning sounds more like CCD. I have watched many times in 20 something temperatures bees flying out for cleansing flights or taking out the dead and they make a quick turn around and fly right back in. Without the solar gain that dark color wrap makes this would happen less often. And prolonged confinement periods are a challenge for the bees.
Perhaps the winters in California are not as prolonged or hard as they are in Indiana or Michigan and wrapping isnít worth the effort.
The Busy Bee teaches two lessons: One is not to be idle and the other is not to get stung.