Studies on antifungal effect of mite alarm pheromone Citral. 1. Evaluation of antifungal effect of Citral

Okamoto, M.; Matsumoto, K.; Wada, Y.; Nakano, H.

Japanese Journal of Sanitary Zoology 29(3): 255-260


DOI: 10.7601/mez.29.255
Accession: 000755391

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It has been observed that fungal growth does not occur on the diet of grain mites while the latter are alive. The cup, gas and modified gas methods were used in laboratory tests in Japan to determine the antifungal effect of citral [3,7-dimethyl-2,6-octadienal], the alarm pheromone of grain mites, and of hexane extracts of Carpoglyphus lactis (L.) on Aspergillus fumigatus. One ml of hexane extract of 20 g wet weight of mites gave the same degree of fungal-growth inhibition as did 4.8 mg/ml of citral. Inhibition of A. fumigatus growth by citral was caused by the fungistatic action of the evaporated gas. It was thought that the reason for fungi not growing on mite diet was that either the mites ate the fungi of that the alarm pheromone inhibited fungal growth.