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标题：Effect of emergence time on some biological aspects of Trichogramma evanescens (Westwood) (Hymenoptera: Trichogrammatidae)
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作者：El-Kazafy A. Taha ; Mohamed B. Shawer ; Farag A. Sharshir 等
期刊名称：Journal of King Saud University - Science
印刷版ISSN：1018-3647
出版年度：2022
卷号：34
期号：4
页码：1-6
DOI：10.1016/j.jksus.2022.101981
语种：English
出版社：Elsevier
摘要：AbstractObjectiveTrichogrammaspecies are minute endoparasitoids of insect eggs that are considered one of the most efficient natural enemies due to their vital role against lepidopteran pests. This experiment was achieved to evaluate the effect of the emergence time ofT. evanescens(Westwood) on the emergence rate, % females, % males, sex ratio, longevity, and the emergence of first generation (F1).MethodsMass rearing ofSitotroga cerealellaandT. evanecsenswas performed and the previous parameters were investigated throughout an emergence period extended to 16 hrs.Results and conclusionThe emergence time has a clear impact on the tested biological parameters. The highest values of % emergence ofT. evanecsenswas obtained at the 7th hrs of emergence. The female percentage increased gradually to achieve the highest rate (63.58%) at the 3rd hrs, then it declined gradually to record the lowest rate (50.00%) at the 15th hrs and 16th hrs of emergence. A significant decrease in the female numbers was started after 8th hrs. There were significant negative correlations between the emerging time and each of emergence percentages and the % female. There was a negative correlation between the emerging time and longevity ofT. evanescens. The longevity was 3.06 days for the parasitoid wasp adults emerged at the 1st hr and enhanced to be 3.19 days at the 3rd hrs. Also, there was a negative correlation between the emerging time and the emerging percentages of F1. Finally, the impact of developmental time on the fitness of female wasps proposes that the high quality ofT. evanescenscould be enlarged by enhancing the percentage of the individuals emerging early at the 7th hrs of emergence.
关键词：KeywordsenBiological controlEgg parasitoidsParasitismF1 progenySex ratio