The Mass Rearing And Predatory Effect Of Orius Sauteri (Hemiptera: Anthocoridae)

Orius sauteri is a valuable polyphagous predator. A great deal of research on it's rearing in laboratory has been carried out in China, but its function and use has not been brought into play enough. Based on the previous research, we try to research a appropriate prey of Orius. sauteri, and its efficiency was assessed by life table method. The influence of temperature on Orius.sauteri reared on different prey and its prey function to thrip, Bemisia tabaci, Tetranytrus cinnabarinus and Brevicoryne brassicae were studied in laboratory. The main conclusions are as follows.1. Nymphal development, survival and adult oviposition, longevity of Orius. sauteri were studied in laboratory using Tyrophagus putrescentiae, Tetranychus cinnabarinus and Brevicoryne brassicae as preys. Results showed that 70%-80% nymphae of Orius.sauteri reared on Tyrophagus putrescentiae could develop into adults, The nymph survival is non difference with B. brassicae reared significantly, but more than Tetranytrus. cinnabarinus (survival rate < 50%) significantly.The adult of Orius. sauteri reared on Tyrophagus putrescentiae could lay eggs, but the egg number was lower than that reared by other preys. In 17.5℃, Orius.sauteri reared on Tyrophagus putrescentiae could not oviposition.2. The influence of temperature (17.5℃,22.5℃,27.5℃) on Orius.sauteri was studied in laboratory. Results showed that the nymphal developmental duration of Orius. sauteri was shortened with the raise of temperature. The nymphal survival of Orius.sauteri reared on Brevicoryne brassicae was increased with the raise of temperature, but that was reversed reared on Tetranychus cinnabarinus. The nymphal survival of Orius.sauteri reared on Tyrophagus putrescentiae was the highest at 17.5℃, then was at 27.5℃, the last was at 22.5℃. The oviposition and longevity of Orius.sauteri adult reared on Brevicoryne brassicae were increased with the raise of temperature, and the oviposition of it reared on Tetranytrus cinnabarinus and Tyrophagus putrescentiae reached maximum at 22.5℃.3. The efficiency of rearing Orius.sauteri by the three preys in different temperature was assessed by life table method. At 17.5℃, Orius.sauteri reared on Tyrphagus putriscenti could not lay eggs. The net fecundity ratio of Orius.sauteri reared on Tetranychus cinnabarinus and Brevicoryne brassicae at 17.5℃were 1.18 and 1.09 respectively, and that reared on Tyrophagus putrescentiae, Tetranychus cinnabarinus and Brevicoryne brassicae were 12.86, 15.93, 6.11 at 22.5℃and 0.88, 3.02, 21.70 at 27.5℃respectively.4. The prey function of Orius. sauteri reared in laboratory to thrip, Bemisia tabaci, Tetranychus cinnabarinus and Brevicoryne brassicae was also studied. The prey function matched with Holling II. The prey consumption of Orius.sauteri was increased with the increase of prey. The prey consumption and prey function of it were reduced with the density increase of itself.