Effect of ultra violet light (UV-C) in different times and heights on adults stage of whitefly (Trialeurodes vaporariorum)

Abstract

The whitefly, Trialeurodes vaporariorum (west wood) is a polyphagous and cosmopolitan species. In, the present study, effect of UV-irradiation on adult of T. vaporariorum was investigated. Adults insect in three heights 70, 80 and 90 cm in eight times include 0.5, 1, 2, 4, 6, 8, 10 and 12 minutes at 27±2 oC, 65±5 % RH and photoperiod of 16: 8 (L: D) conditions by UV-irradiation (254 nm wavelength) were exposed and mortality counted after 24 and 48 hours. The results indicated that all exposure periods of UV-irradiation increased mortality of adults. With increase in time of exposure irradiation and decreasing distances caused a gradual increase in percentage of mortality. LT50 value after 24 hours in 70, 80 and 90 heights in 0.5, 1, 2, 4, 6, 8, 10 and 12 minutes’ exposers period were (29.77, 39.99, 42.22, 49.99, 57.77, 61.1, 70.74, 75.55), (28.33, 32.22, 34.17, 45.59, 50.87, 54.94, 66.13, 70.47) and (21.81, 26.66, 29.81, 40, 49.33, 50.14, 56.19, 60.83), respectively. The result of present study showed that we can use ultra- violet light in integrated pest management greenhouse and stored products.