Abstract

Comparative studies of the ecological and genetic traits of Panonychus citri (McGregor) populations on citrus and other host plants were conducted. Panonychus citri on Osmanthus trees has a unique esterase allele and host range in comparison with populations on other host plants, for example Citrus unshiu and Ilex crenata. Reproductive incompatibility between P. citri populations on C. unshiu and Osmanthus fragrans was found. Therefore, in Japan, P. citri differentiates into two groups one of which associates with Osmanthus, and the other with other host plants.

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