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Chinese Journal Of Biological Control ›› 2019, Vol. 35 ›› Issue (6): 848-854.DOI: 10.16409/j.cnki.2095-039x.2019.05.007

• RESEARCH REPORTS • Previous Articles     Next Articles

Effects of Larvae Body Size of Thyestilla gebleri on Oviposition Decision of Sclerodermus alternatusi

CHEN Ran1, TANG Yanlong2, TANG Hua1, WANG Xiaoyi1, YANG Zhongqi1   

  1. 1. Key Laboratory of Forest Protection, State Forestry and Grassland Administration of China/Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;
    2. School of Life Science and Agrotechnological Academy, Zunyi Normal College, Zunyi 563000, China
  • Received:2019-03-12 Online:2019-12-08 Published:2019-12-18

Abstract: Effects of host size on the oviposition decision of Sclerodermus alternatusi, an ectoparasitoid of Monochamus alternatus, were determined to support artificial rearing of the parasitoid and its use in biological control. Parasitoids were artificially reared on Thyestilla gebleri larvae of different size (0.10-0.15 g, 0.15-0.20 g, 0.20-0.25 g, 0.25-0.30 g, 0.30-0.35 g) under laboratory conditions. The parasitism and oviposition behaviors were observed and the progeny number and sex ratio were recorded. The results showed that host size did not affect the parasitism rate of S. alternatusi, while did affect the progeny fitness. Progeny number was positively related with host size and the male proportion of progeny declined with the increase of host size. These findings reveal that host size does not affect the oviposition decision of S. alternatusi, but influence the progeny fitness.

Key words: Sclerodermus alternatusi, host size, parasitism rate, development duration, number of progeny, male proportion

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