Effects of host stages and temperature on population parameters of Oomyzus sokolowskii, a larval-pupal parasitoid of Plutella xylostella

文献类型： 外文期刊

第一作者： Wang, XG

作者： Wang, XG;Liu, SS;Guo, SJ;Lin, WC

作者机构：

关键词： host stage preference;host suitability;temperature effects

期刊名称：BIOCONTROL （ 影响因子：3.571； 五年影响因子：3.243 ）

ISSN： 1386-6141

年卷期： 1999 年 44 卷 4 期

页码：

收录情况： SCI

摘要： Oomyzus sokolowskii is a larval-pupal parasitoid of diamondback moth, Plutella xylostella. In a host stage preference test, the parasitoid parasitised all larval and pupal stages, but exhibited a strong preference for larvae over prepupae or pupae, and did not show a preference among the larval instars. At 25 degrees C, the developmental time, number and sex ratio of offspring per host pupa, and successful parasitism did not differ significantly among parasitoids reared from host larvae of different instars, indicating similar host suitability between larvae of different instars. Mean developmental times from egg to adult at 20, 22.5, 25, 30, 32.5, and 35 degrees C were 26.5, 21.0, 16.0, 12.7, 11.9 and 13.4 days, respectively. The favourable temperature range for development, survival, and reproduction of the parasitoid was 20-30 degrees C. However, wasps that developed and emerged at a favourable temperature could parasitise effectively at 32-35 degrees C for 24 hours. Life-fertility table studies at 20, 25, and 30 degrees C showed that each female wasp on average parasitised 3.1, 13.2, 6.8 larvae of diamondback moth and produced 20.5, 92.1, 50.4 offspring, respectively, during her lifetime. The highest intrinsic rate of natural increase (r(m)) of 0.263 female/day was reached at 30 degrees C as a result of the short mean generation time at this temperature compared to that at 20 and 25 degrees C, suggesting that the parasitoid had the highest potential for population growth at relatively high temperatures.

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