|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5762535||1412933||2017||7 صفحه PDF||ندارد||دانلود کنید|
â¢Adults of Rhyzopertha dominica were exposed to 0.42 and 0.84Â g/m3 concentrations of ozone.â¢LD99 and LT99 values were estimated based on corrected 1â5Â d adult mortality after exposure.â¢ED99 and ET99 values were estimated based on reduction in adult progeny production after ozone exposure.â¢More adults died on day 5 compared to day 1 suggesting delayed toxic effects of ozone.â¢Doubling the ozone concentration did not reduce the LT99 and ET99 values by half.
Adults of a laboratory strain of the lesser grain borer, Rhyzopertha dominica (F.), were exposed to ozone concentrations of 0.42 and 0.84Â g/m3 for up to 36 and 30Â h, respectively, to estimate lethal time (LT) and lethal dose (LD) to kill 99% of insects at 28Â Â°C and 65% r.h. After exposure, adult mortality was counted daily for 5Â d. Adult progeny production data from ozone-exposed adults was used to estimate effective time (ET) and effective dose (ED) for 99% reduction in adult progeny production. At 0.42 and 0.84Â g/m3, LT99 values for adult mortality on day 1 were 67 and 42Â h, respectively. Corresponding LD99 values for adult mortality on day 1 were 28 and 36Â g-h/m3, respectively. On day 5, LT99 and LD99 values decreased by 52â54% of day 1 values. The LT99 or LD99 values over days 1 through 5 decreased in a nonlinear fashion, suggesting delayed toxic effects of ozone. The ET99 value for reduction in adult progeny production was 22Â hÂ at an ozone concentration of 0.84Â g/m3, whereas it was 39Â hÂ at 0.42Â g/m3. Like LD99 values, ED99 value for adult progeny reduction at 0.42Â g/m3 of ozone was lower than at an ozone concentration of 0.84Â g/m3. Doubling the ozone concentration from 0.42 to 0.84Â g/m3 did not reduce the LT99 or ET99 values by 50%. In general, the LD99 values on days 1 through 5Â at an ozone concentration of 0.84Â g/m3 were significantly greater than similar values at an ozone concentration of 0.42Â g/m3, suggesting that R. dominica adults tend to be more susceptible when exposed to a low ozone concentration for extended time periods.
Journal: Journal of Stored Products Research - Volume 70, January 2017, Pages 53-59