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The effects of red-light irradiation and a reflective sheet cover on the population density of two thrips species（Thysanoptera: Thripidae）, the melon thrips（Thrips palmi Karny）and the onion thrips （Thrips tabaci Lindeman）, were investigated on eggplant and cucumber in a greenhouse in 2014 and 2015. Red fluorescent lamps were illuminated from above the plants and a light reflecting sheet was placed on the ridges of the treated plots. A greenhouse without either material was set up as a control plot. The population densities of the two thrips species on eggplant and T. palmi on cucumber were significantly lower in the treated plots than in the control plot. [ABSTRACT FROM AUTHOR]

The effects of ultraviolet-B radiation over three hours at night on the survival and development of four agricultural pests of thrips and their predator, Haplothrips brevitubus（Karny）, were investigated at 20°C under 14L10D conditions. UV-B radiation ≤8.7 µW/cm2 did not affect the hatchabilitiy of terebrantian eggs inserted into leaf tissue, but the four pest species of thrips showed lower percentages of adult emergence and delayed larval development at UV-B radiation ≥6.5 µW/cm2. No adults emerged for Thrips palmi Karny, Frankliniella occidentalis（Pergande）, and Thrips tabaci Lindeman reared under UV-B radiation ≥6.5 µW/cm2, while 10% of Frankliniella intonsa（Trybom）reared under UV-B radiation of 8.7 µW/cm2 eclosed into the adult stage. Pest thrips emerging into adults under UV-B dose conditions exhibited curl and shortening of the forewings, and over 38% of adults had abnormal forewings even under a low dose of UV-B radiation of 1.5 µW/cm2. UV-B radiation ≤3.0 µW/cm2 after adult emergence did not affect the longevity and fecundity of female adult thrips in the four pest species. UV-B radiation decreased egg hatchability and the percentage of survival in the larval stages for H. brevitubus, and no thrips emerged into adults under UV-B radiation ≥4.8 µW/cm2. [ABSTRACT FROM AUTHOR]