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The spider mite, Tetranychus kanzawai Kishida is a serious pest on a variety of agricultural crops and is most abundant in East Asia (Ehara, 1999), although now it is observed worldwide including South-east Asia, Oceania and North America (Bolland et al., 1998). As in many Tetranychus species, T. kanzawai undergoes a reproductive diapause mainly induced by short-days and low temperatures. Most populations in Japan, except those from Okinawa, have genetically a very high capacity for diapause and express more than 90% diapause when induced at 15°C (Takafuji et al., 2001, 2003). In Taiwan, T. kanzawai is one of the most common spider mites, occurring on a variety of host plants (Ho, 2000). Our previous study (Takafuji et al., 2005) showed that Taiwanese T. kanzawai populations have genetically much diversified diapause characteristics. Many of the populations have a high capacity for diapause, as shown by high diapause percentages if induced in the laboratory, while they are distributed in the subtropics. Herein we studied the overwintering ecology of T. kanzawai in west-central Taiwan, to elucidate whether the high diapause capacity shown in laboratory experiments is exerted also in the field of Taiwan.

The Overwintering Ecology and Diapause Capacity of Tetranychus kanzawai Kishida (Acari: Tetranychidae) in West-Central Taiwan