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Impact of host suitability on oviposition preference toward fertilized and unfertilized host eggs in two Trichogramma parasitoid species

文献类型： 外文期刊

作者： Li, Xiao-Yang 1 ; Lei, Qi 1 ; Hua, Hai-Qing 1 ; Song, Hong-Feng 2 ; Wang, Su 3 ; Ramirez-Romero, Ricardo 4 ; Dai, Huij 1 ;

作者机构： 1.Nanjing Agr Univ, Dept Entomol, Nanjing 210095, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Hort, Nanjing 210095, Jiangsu, Peoples R China

3.Beijing Acad Agr & Forestry Sci, Inst Plant & Environm Protect, Beijing 100097, Peoples R China

4.Univ Guadalajara, CUCBA, Dept Agr Prod, Biol Control Lab, Zapopan, Jalisco, Mexico

5.Weifang Univ Sci & Technol, Facil Hort Lab Univ Shandong, Weifang 262700, Peoples R China

关键词： Trichogrammatidae; fertilization; choice test; suitability; parasitism; preference

期刊名称：ENTOMOLOGIA GENERALIS （ 影响因子：5.625； 五年影响因子：4.207 ）

ISSN： 0171-8177

年卷期： 2019 年 39 卷 3-4 期

页码：

收录情况： SCI

摘要： The preference of Trichogramma parasitoids is known to be modulated by the fertilization status of host eggs encountered. However whether the actual suitability of host eggs is at play for modulating the preference of Trichogramma when choosing fertilized vs. unfertilized host eggs has not been well documented yet. In the present study, fertilized and unfertilized eggs of Ostriniafurnacalis (Guenee) (Lepidoptera: Crambidae), of which the eggs are suitable for Trichogramma ostriniae (Pang & Chen) (Hymenoptera: Trichogrammatidae) but are suboptimal for T. dendrolimi Matsumura, were used to investigate host preference, host acceptance, and offspring performance of the two Trichogramma species. The results showed that, in a no-choice test, T. dendrolimi parasitized significantly more unfertilized O. furnacalis eggs than fertilized ones. In contrast, the number of fertilized eggs parasitized by T. ostriniae was significantly higher than for unfertilized eggs. The sex ratio (female proportion), developmental time and fitness of offspring wasps were similar between fertilized and unfertilized host eggs for both Trichogramma species. In a choice test, T. dendrolimi preferred unfertilized host eggs over fertilized ones, whereas T. ostriniae did not show a preference. The higher rate of eggs laying by T. dendrolimi on unfertilized eggs than on fertilized ones may explain the different parasitism performances reported for the two Trichogramma species.

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