I've noticed that some of the organic and conventional melds that can used in the hive require that they be used only during the warmer months. Given the fact that hive temperatures are normally much warmer around the brood and that hive temperatures are generally elevated, is the problem really centered on the broadcasting of the medicines?
Having said that,..... couldn't a terrarium heater or Robo's heater made from Christmas lights, effectively aid in distribution of these meds during spring and early fall?
Regards,
Tucker