Oviposition on preference of Orius similis and preservation condition of eggs
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Key Words：Orius similis, host plant, choice of oviposition, eggs, conservation
Abstract：The amount of eggs, hatching rate and the propagation coefficient of the Orius similis Zheng (Hemiptera：Anthocoridae) on 9 host plants were tested in the laboratory. Host plants included Capsicum frutescens (L.), Vigna unguiculata(L.)Walp, Kalanchoe blossfeldiana, Jasminum nudirlorum, Vitex negundo(L.), Vigna radiata, Gossypium hirsutum(L.), Echeveria peacockii, and Portulaca grandiflora. The results showed that amount of eggs on C. frutescens was highest, accounting for 23.4% of all. The highest hatching rate was found on J. nudirlorum. The propagation coefficients of the insects on C. frutescens and J. nudirlorum were 7.6 and 12.8, respectively, higher than on the other hosts. C. frutescens had higher egg amount and lower viability, whereas J. nudirlorum had lower egg amount and higher viability. The cold tolerance of O. similis were also studied. It showed that eggs had the highest cold tolerance, lower in adults, and the lowest in 1st and 2nd instar nymph. The best preservation condition to keep 80% hatching rate of eggs was at 8℃ for 9 days.