A total of 27 analogues of the astigmatid mite sex pheromone, 2-hydroxy-6-methylbenzaldehyde (6-methylsalicylaldehyde), were prepared and their activities were determined against two species. Aleuroglyphus ovatus and Acarus immobilis. Four analogues, 2-methylbenzaldehyde, 2-methylacetophenone, 6-methylsalicylic acid and 2-methylbenzoic acid, evoked the pheromone activity against A. ovatus, among which 6-methylsalicylic acid and 2-methylbenzoic acid exhibited the same level of the activity as that of the pheromone. On the other hand, five substituted salicylaldehydes (3-isopropyl-6-methyl-, 6-ethyl-, 3-methyl-, 3-ethyl-and non-substituted) and 4-hydroxy-2-methylbenzaldehyde indicated the activity against A. immobilis, whose activities were one-tenth of that of the pheromone at the best. As a result, each species demonstrated the similar pheromone behavior upon exposure to the different set of analogues, other than to the natural pheromone.
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