With the objective to prevent moth-eating damage caused by insects, the system containing baker's yeast adsorbed by a water-absorbing polymer, Diawet US60, was prepared. The moth-eating damage caused by Attagenus unicolor japonicus was evaluated by use of a woolen cloth (2 cm2, 40 mg) with or without the system in 1 L glass vessel at 25 °C for 7 days. The moth-eating damage rates with and without the system were 3.3% and 54%, respectively, and the death rate of insect reached 100% with the system due to the respiration of yeasts.
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