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journal1 ›› 2017, Vol. 33 ›› Issue (6): 803-810.DOI: 10.16409/j.cnki.2095-039x.2017.06.013

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Biology and Bio-control Potential of Zele chlorophthalmus (Hymenoptera:Braconidae), a Parasitoid of Beet Webworm, Loxostege sticticalis (Lepidoptera:Crambidae)

LI Qian, CHENG Yunxia, LUO Lizhi, DU Qin, JIANG Xingfu, ZHANG Lei   

  1. State Key Laboratory for Biology of Plant Diseases and Insect Pests/Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
  • Received:2017-07-17 Online:2017-12-08 Published:2017-12-16

Abstract: Zele chlorophthalmus (Spinola) (Hymenoptera:Braconidae) is a solitary endo-parasitoid of larval beet webworm, Loxostege sticticalis L. (Lepidoptera:Crambidae). Life history characteristics and bio-control potential of this parasitoid were investigated at 23℃, RH 70%±5%, and photoperiod of 16L:8D by using the 3rd instar L. sticticalis as host. Our results showed that Z. chlorophthalmus needed 14.7, 14.5 and 30.1 days, respectively, to complete development of egg and larvae, pre-pupae and pupae, and full generation. Cocoon weighed 18 mg in average. Adults emerged predominantly from 06:00 to 14:00 h during a day and male adults emerged 2 days earlier than females. Females mated soon after emergence with a mating duration of 59-168 s. Oviposition/parasitization began soon after mating and peaked at the 3rd and 7th day during the 11 days of oviposition period. Totally, 104 larvae could be successfully parasitized by a female during her 15.2 day lifespan, which was shorter than males (19.0 days). Number of host larvae parasitized by Z. chlorophthalmus increased while parasitism rate decreased with host density increased from 5 to 30 larvae/650 mL jar, which could be well described by the model of Holling typeⅡ. Head width, body length and weight of the host larvae at 6th and 12th days after parasitization, and total food consumed by the parasitized host were significantly less than those of the unparasitized larvae. The biology and bio-control potential of Z. chlorophthalmus were finally compared and discussed with other wasp species, especially those parasitizing L. sticticalis.

Key words: Zele chlorophthalmus, Loxostege sticticalis, biological characteristics, parasitism rate, functional responses

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