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Neoseiulus californicus has been increasing in number and geographical distribution since the 1990s in Japan, and is considered to be a new prospective predator species against Panonychus citri on citrus. We investigated the occurrence of N. californicus in citrus orchards with different agrochemical spraying programs in Kyushu district, south-western Japan. The occurrence of N. californicus greatly differed among orchards. In conventional control orchards and agrochemical-reduced orchards, N. californicus females were observed in 50-60% of orchards. On the other hand, N. californicus females were rare in agrochemical-free orchards. N. californicus females were observed in all prefectures in the Kyushu district, but the occurrence of N. californicus was different among the § 果樹研究所業績番号：1465

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