桉树枝瘿姬小蜂产卵行为研究

Oviposition behavior of Leptocybe invasa

桉树枝瘿姬小蜂Leptocybe invasa Fisher&La Salle喜好在桉属(Eucalyptus)植物的新生部位产卵。本研究以尾赤桉为寄主研究其产卵模式发现,当天羽化且没有产卵经验的雌成虫在经过寄主识别(116.87 s)和寄主评估(208.27 s)后即进行产卵循环(平均5.87次),每个产卵循环产2粒卵,且搜索行为的发生一般伴随产卵位置的变换。在被观察的15头雌成虫中,平均每头产卵13.60粒,每次产卵持续17.31 s。在产卵过程中,其刺探行为所占总时间的比例和发生频次最大,而静息行为最小。在不同寄主植物间,桉树枝瘿姬小蜂喜好在尾赤桉的叶柄和叶脉处产卵,且2个部位间无显著性差异,而在尾叶桉、巨尾桉、隆缘桉和小果灰桉上,其喜好在叶柄处产卵且显著大于其它2个部位。

Leptocybe invasa Fisher ＆ La Salle prefer laying eggs on new branches of Eucalyptus plants. The oviposition behavior of this insect on E. urophylla ~ E. camaldulensis was investigated. Before comming in the laying cycle L. invasa must go through a process of host discrimination and exploration. It can lay two eggs in one cycle, and running or walking while drumming followed changing in oviposition sites. Based on a sample of 15 female wasps, the average number of eggs per female was 13.60 and the average duration for laying one egg was 17.31 s. In the L. invasa laying egg process, the frequency of prying behavior was significantly higher, and standing behavior was obviously lower, than other behaviors. On E. urophylla x E. camaldulensis, L. invasa favored laying eggs on petioles and midribs, and there were no significant differences in the number of eggs laid on these sites, but on E. urophylla, E. grandis ~ E. urophylla, E. exserta, and E. propinqua, it significantly favored petioles to midribs and twigs.