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The effect of a predatory mite, Neoseiulus californicus (McGregor) release to control a population of two-spotted spider mite, Tetranychus urticae Koch, was investigated in a chrysanthemum greenhouse. After spider mite inoculation, we released N. californicus females at prey:predatory ratios of 20:1, 10:1, or 5:1. The population densities of spider mites began to decrease 4 weeks after predator release and reached almost 0 after 5 weeks. We found that N. californicus could reduce the population density of spider mites, when the N. californicus/T. urticae ratio was 10:1 or more.

kansai byouchuugai kenkyuukaihou/kansai byōchūgai kenkyūkaihō

Effect of &lt;i&gt;Neoseiulus californicus&lt;/i&gt;-spider mite ratio for controlling &lt;i&gt;Tetranychus urticae&lt;/i&gt; in a chrysanthemum greenhouse