Pheromone study on acarid mites IV. Citral: composition and function as an alarm pheromone and its secretory gland in four species of acarid mites

Kuwahara, Y.; Matsumoto, K.; Wada, Y.

Japanese Journal of Sanitary Zoology 31(2): 73-80


DOI: 10.7601/mez.31.73
Accession: 000948669

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In this further part of a series from Japan on alarm pheromones in acarid mites [see RAE/B 68, 3223], it is reported that bioassay and biological investigations with Aleuroglyphus ovatus (Troup.), Carpoglyphus lactis (L.), Lardoglyphus konoi (Sasa & Asanuma) and Dermatophagoides farinae Hughes showed that citral, (a mixture of neral ((Z)-3,7-dimethyl-2,6-octadienal) and geranial ((E)-3,7-dimethyl-2,6-octadienal)), and neryl formate ((Z)-3,7-dimethylocta-2,6-dienyl formate) were both more or less active as alarm pheromones and were not strictly species-specific within these 4 species of mites and Tyrophagus putrescentiae (Schr.). Citral was emitted into the environment, and the quantity of the emission was 10-50 times greater when the mites were disturbed than when they were not disturbed. Furthermore, the proportion of neral in the emissions increased from 54-66 to 74-86% when the mites were disturbed. The original composition of extracted citral included more than 90% neral in the case of A. ovatus, C. lactis and D. farinae and 75% in the case of L. konoi. Citral was secreted by the latero-abdominal gland in all species.