Effects of host stages and temperature on population parameters of Oomyzus sokolowskii, a larval-pupal parasitoid of Plutella xylostella |
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Authors: | Xin-geng Wang Shu-sheng Liu Shi-jian Guo Wen-cai Lin |
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Institution: | (1) Department of Plant Protection, Zhejiang University, Hangzhou, 310029, China;(2) Zhejiang Academy of Agricultural Science, Institute of Plant Protection, Hangzhou, 310021, China;(3) Dept. of Applied and Molecular Ecology, The University of Adelaide, Waite Campus, Glen Osmond, SA, 5064, Australia |
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Abstract: | Oomyzus sokolowskii is alarval-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 larvaeover prepupae or pupae, and did not show a preference among the larval instars. At 25°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°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°C.
However, wasps that developed and emerged at a favourable temperature could parasitise effectively at 32--35°C for 24 hours.
Life-fertility table studies at 20, 25, and 30°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°C as a result of the short mean generation time at this temperature compared to that
at 20 and 25°C, suggesting that the parasitoid had the highest potential for population growth at relatively high temperatures.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | host stage preference host suitability temperature effects |
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