Egg Parasitism Efficiency and Selectivity of Telenomus remus against the Spodoptera frugiperda and Spodoptera litura under Different Wasp-egg Ratios

doi:10.16409/j.cnki.2095-039x.2024.07.022

Abstract

Abstract: The fall army worm (FAW), Spodoptera frugiperda (Smith), is a major migratory pest that invaded to China in recent years. A parasitoid Telenomus remus (Nixon) is an egg-parasitoid natural enemy of several insect taxa in the family of Noctuidae, for which the cotton leaf worm (CLW), Spodoptera litura (Fabricius), is one of the most suitable hosts. In this experiment, we used FAW and CLW eggs to analyze the parasitism efficiency under different wasp-egg ratios and compared the parasitism preference of T. remus for the hosts. The results showed that, when the wasp-egg ratios decreased from 1:10 to 1:100, the parasitism and progeny emergence rate on eggs of FAW decreased from 97.58% and 76.41% to 74.50% and 33.94%, respectively, and the female wasp ratio in offspring increased from 61.74% to 82.16%. When the wasp-egg ratios decreased from 1:30 to 1:140, the parasitism and progeny emergence rate on eggs of CLW decreased from 97.67% to 53.11% and 79.29% to 24.99%, respectively. Given the same wasp-egg ratio, the parasitism rate and emergence rate of T. remus on FAW eggs were significantly lower than those of CLW eggs. When offered eggs of the two host species at the same time, the wasps parasitized more CLW eggs (136.6) than FAW eggs (100.0) in 24 h. In conclusion, there is a significant effect of different wasp-egg ratios on the parasitism efficiency of T. remus on either single host, higher on CLW eggs than on FAW eggs. When the eggs of the two host species coexist, T. remus preferred more for CLW eggs. The results indicate that the effectiveness of T. remus to FAW is susceptible to interference from other host species such as CLW, therefore, there is still room improving the parasitism efficiency. The results of this study provide a theoretical basis for the development and optimization of the artificial release of natural enemies for the control of FAW through increasing the wasp-host egg ratio or aided with the specific attractant.

Key words: Spodoptera frugiperda, Telenomus remus, Spodoptera litura, wasp-egg ratio, parasitism preference, parasitism efficiency

CLC Number:

S476.3

WANG Huijuan, CHENG Yumeng, GU zimeng, JIANG Jun, LI Kebin, JIA Dong, FAN Jia, CHEN Julian. Egg Parasitism Efficiency and Selectivity of Telenomus remus against the Spodoptera frugiperda and Spodoptera litura under Different Wasp-egg Ratios[J]. Chinese Journal of Biological Control, 2025, 41(3): 642-649.

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