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- Author or Editor: Takeshi Suzuki x
- HortScience x
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).