Preliminary study on the attractant of egg-laying females of Cephalica chuxiongnica Xiao (Hymenoptera: Pamphiliidae)
Cephalcia chuxiongica Xiao (Hymenoptera: Pamphiliidae) is one of the most dangerous defoliators of Pinus yunnanensis Franch. and other pine species in Yunnan Province, resulting in serious losses. Its damage characteristics are the females' aggregation of oviposition and larvae's aggregati...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2019-08-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2018.06.191 |
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| Summary: | Cephalcia chuxiongica Xiao (Hymenoptera: Pamphiliidae) is one of the most dangerous defoliators of Pinus yunnanensis Franch. and other pine species in Yunnan Province, resulting in serious losses. Its damage characteristics are the females' aggregation of oviposition and larvae's aggregation of feeding. In order to explore the chemical mechanism of the aggregation of oviposition, olfactory responses of the females to odors of pine needles and insect ovipositors were tested by means of Y-olfactory meter. In one-way choice tests, unmated females tended to the extracts of fresh needles with or without fresh eggs, but they did not tend to the eluents of fresh needles with or without fresh eggs, and the eluents both of unmated and mated female ovipositors. The mated females tended neither to the eluent of fresh needles nor to the eluent of unmated female ovipositors, but could be attracted by the crude extracts of fresh needles with or without fresh eggs, the eluent of fresh needles with fresh eggs and the eluent of mated female ovipositors. In two-way choice tests, the mated females showed tendency to the eluent of fresh needles with fresh eggs and the eluent of mated female ovipositors, neither to the eluent of fresh needles nor to the eluent of unmated female ovipositors. Based on the results, we conclude: 1) The volatiles in host needles play an important role in the females' host search and selection; 2) the critical factor that attracts the mated females to aggregate to one pine shoot for oviposition is the volatile from the accessory genital glands of the pioneer egg-laying female. |
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| ISSN: | 1008-9209 2097-5155 |