Research in both California and Washington indicates aldicarb in nectar affects colonies. Unfortunately, we have no way to correlate research done on the west coast with Florida conditions. There are several things that can be done. Correlate nectar and honey crops with where the pesticide might have been applied, and ask growers and managers if they use the material and where. Also inquire of other beekeepers in the area about their experiences in recent times.
Reports indicate severe problems have only occurred in the last five years or so.
In other words, as with any other management decision, get all the facts before committing your bees to certain citrus locations. A final word of caution. Communicate and cooperate with grove owners and managers on this issue. Most are willing to provide basic information on their practices. Be careful concerning treatment of the aldicarb issue.