In using glucose,fructose, or say honey, it is important not to use them day after day. The reason is that many yeasts and moulds, as well as innocent and dangerous strains of bacteria, also use the sugars for their own life processes, including reproduction. Yeasts or moulds, if in the precence of these sugars for too many days, can multiply extensivley and begin to invade the wall of the crop and other organs where they can cause serious illness and death. For these reasons, it is best to use sugars for one or twa days at the most.
I read this in "Vets tips for fanciers" by Dr. Zsolt Talabar.
Al.