**** 1992 "Rhizopus species vary markedly in their sensitivity to chemicals: for example DCNA (dichloran, Botran ) controls R. stolonifer but is not effective against R. circinans and R. arrhizus ." "Solutions containing chlorine dioxide and ozone have been less effective than chlorinated water. With both of these chemicals, concentrations over 2 fil^l are difficult to establish and maintain. Furthermore, the release of chlorine and ozone, both highly toxic to humans, makes the use of these materials in enclosed packing sheds questionable. Currently, chlorine dioxide in foam for sterilisation of packing house equipment shows promise." "In the preparation ofchlorine water, the pH of the solution determines the concen-tration of the hypochlorous acid (active ingredient) with aneutral or slightly basic solution preferred. Acidic chlorinesolutions have a tendency to release chlorine gas, and basicsolutions are less effective as the concentration of hypochlor-ous acid is reduced."