For the purpose of the amelioration of field test methods, commercial preservatives against mold fungi were tested under two different seasons, in winter and in summer. The specimens were bundled and set over the water bath and all these systems were covered with plastic film. At top of the system under film, black films for regeneration of sunlight were put in, and windows for changing air were reserved in summer. The visual evaluation of damage (rating 0-4) was done periodically. The results obtained as follows. 1.) The evaluation values after 2 months in winter were simmilar results as those after 3 weeks in summer. 2.) The fungicides, mixture of nitoril compound and organo nitrogen sulfuric compound, mixture of thiocyanate compound and organo nitrogen sulfuric compound, were obtained good results in field. Those percentage of the specimens rating under 1 were more than 50% and those mean rating were not more than 2. 3.) In the case of organo iodide compound, the results in winter were good but in summer were not so good.

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