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Katai Y.,Shizuoka Prefecture Research Institute of Agriculture and Forestry | Katai Y.,Japan Forestry and Forest Products Research Institute | Ishikawa R.,Shizuoka Prefecture Research Institute of Agriculture and Forestry | Doi M.,Shizuoka Prefecture Research Institute of Agriculture and Forestry | Masui S.,Shizuoka Prefecture Research Institute of Agriculture and Forestry
Japanese Journal of Applied Entomology and Zoology | Year: 2015

Irradiation of melon (Cucumis melo) seedlings with red LED light (wavelengths of 620 to 630 nm) at an intensity of 1×1018 photons m-2 s-1 decreased the number of Thrips palmi (melon thrips), a major insect pest that causes serious damage during greenhouse melon cultivation. Thrip populations were significantly lower than in treatments without LED, both with continuous 24-h irradiation and with 12-h daytime (06:00 to 18:00) irradiation. Transplanted seedlings were also irradiated with red LED light of two different intensities (4.7×1018 photons m-2 s-1 or 1.0×1018 photons m-2 s-1) in two cultivation environments (glass or plastic greenhouse). These findings suggest that irradiation with red LEDs may be an effective means of controlling Thrips palmi in greenhouse melon cultivation. Source


Haga H.,Shizuoka Prefecture Research Institute of Agriculture and Forestry | Katai Y.,Shizuoka Prefecture Research Institute of Agriculture and Forestry | Katai Y.,Japan Forestry and Forest Products Research Institute | Mannen J.,Shizuoka Prefecture Research Institute of Agriculture and Forestry | Masui S.,Shizuoka Prefecture Research Institute of Agriculture and Forestry
Japanese Journal of Applied Entomology and Zoology | Year: 2014

Trapping tests for melon thrips, Thrips palmi, were carried out using 17 colored resin sheets, 8 LED lights, and 2 types of plate. Among the colored resin traps, more thrips were captured by resin with a peak spectral reflectance between 481 and 523 nm. Among the 8 LED light traps covered with a diffuser, more thrips were captured by LED traps with peak wavelengths of 500 or 525 nm. When the LED light traps were covered by a transparent acrylic plate, the 470-nm LED trap captured as many thrips as the 525-nm LED trap, and both produced the highest capture rate. In an experiment that combined LED traps with one of three wavelengths(470, 500, or 525 nm) and either a diffuser or a transparent plate, the 470-nm LED trap captured fewer thrips than the other combinations, and the 470-nm trap covered by a diffuser captured significantly fewer thrips than the same trap covered by a transparent plate. Significantly higher captures were obtained using 500- or 525-nm LEDs covered by transparent plates. Thus, melon thrips were stably attracted to light at wavelengths from 500 to 525 nm. Source

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