Biocontrol of Tetranychus kanzawai (Acari: Tetranychidae) using Phytoseiulus persimilis (Acari: Phytoseiidae) in open-air strawberry gardens
1996
Zhang, Yanxuan | Lin, Jianzhen | Chi, Yanbin | Chen, Wei | Lin, Song
Tetranychus kanzawai Kishida (TKK) is an important injurious mite in open-air strawberry gardens in southern China, affecting both the quality and quantity of strawberry crop. Laboratory studies showed that adult females of Phytoseiulus persimilis Athias-Henriot could consume 4–5 TKK females per day, whereas adult males and nymphs could consume 2–4 TKK females. Studies on predator responses to prey density revealed type II functional responses for both adult and deutonymph predators. Studies on predator response to its own density revealed that per capita attack rate (A) decreased with predator density (P): A = 9.539 P-0.698 (r = -0.988). Laboratory studies showed that predator and prey (N) dynamics could be described by the Lokta-Volterra model: dN/dt = N (0.111 + 0.898 P) and dP/dt = P (-0.138 + 0.023 N). Field observations showed that release of two predators per plant in mid March provided effective control of TKK during the rest of the growing season.
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