What is the evolutionary prerequisite concerning the host phenology for the parasitic female's spring emergence?

Her emergence must be synchronized with the host colonies being active enough for invasion.

The timing of the parasitic female's emergence in the spring is critically evolved to align precisely with the life cycle, or phenology, of her susceptible host species. If the parasitic female emerges too early, the host queens will not have initiated their colonies, leaving no suitable target for invasion. Conversely, emerging too late means the host colonies may have grown substantially, developed robust defenses, or the host queen may have been replaced by workers, making successful infiltration much more difficult or impossible. This synchronization ensures that the parasitic female encounters a vulnerable, active host queen ready to begin colony founding.