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The two-spotted spider mite ( Tetranychus urticae  Koch.) has a worldwide distribution and is one of the most harmful agricultural pests for a variety of plant species. To reveal a visible light wavelength that reduces the population growth rate (as  r  m , unit: d –1 ) of the mite, we investigated the  r  m  under wavelength peaks of 468, 515, and 658 nm with half bandwidths of 23, 44, and 22 nm using blue, green, and red light-emitting diodes, respectively. In all treatments, light intensity was set at 2.3 W·m –2  with a light period of 16 h·d –1 , and air temperature was set at 25 °C. The survival percentage ( l  x ) and the number of eggs deposited per female ( m  x ) on each age ( x , unit: d) were determined to calculate the  r  m  by the following equation: ∑exp(– r  m  ·  x )·  l  x  /100 ·  m  x  = 1. The  r  m  and the total  m  x  decreased with increasing wavelength. This result shows that the population growth rate can be reduced under red light (658 nm).

(363) Effect of Visible Light Wavelengths on the Population Growth Rate of the Two-spotted Spider Mite (Tetranychus urticae Koch.)