Biological Control of Insect Pests in Japan: Control of Multiple Pests of Tea, and Spider Mites in Greenhouses

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In Japan, there is growing public concern about the excessive use of agricultural chemicals. Growers have become interested in the use of natural enemies in pest management programs. This paper introduces two examples of pest management using natural enemies in Japan. In the production of tea, there is the problem of controlling multiple pest species that occur simultaneously. The use of a predacious phytoseiid mite, Amblyseius womersleyi, which was resistant to synthetic pyrethroids, was found to be very effective in suppressing populations of spider mites while the pyrethroid sprays were applied which were necessary to control two sucking pests. In the second example, the release of the phytoseiid mite Phytoseiulus persimilis onto ground cover in a greenhouse where grape vines were grown was effective in suppressing the population of spider mites. This prevented their migration onto the grape vines.

Akio Takafuji
Hiroshi Amano
Chiba University, Japan