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Sublethal Effects of Emamectin Benzoate on Fall Armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae)
| Content Provider | MDPI |
|---|---|
| Author | Liu, Zhuo-Kun Li, Xue-Lin Tan, Xiao-Feng Yang, Mao-Fa Idrees, Atif Liu, Jian-Feng Song, Sai-Jie Shen, Jian |
| Copyright Year | 2022 |
| Description | Fall armyworm (FAW), Spodoptera frugiperda (Lepidoptera: Noctuidae), is a highly invasive polyphagous pest that causes great economic losses to agricultural production. Emamectin benzoate (EMB) is one of the most popular biopesticides with high antipest, anti-parasitic and anti-nematode activities and low toxicity. The present study was conducted to determine the lethality of EMB to FAW for 24 h. Sublethal effects of EMB on FAW parental and offspring generations were also assessed. $LC_{10}$, $LC_{20}$ and $LC_{50}$ EMB for 24 h on FAW third instar larvae were 0.0127 mg/L, 0.0589 mg/L, and 0.1062 mg/L, respectively. A low dose of sublethal concentrations of EMB could significantly influence the life cycle of FAW parental and offspring generations. Sublethal concentration $(LC_{20}$) of EMB significantly prolonged the pupal period of male and increased the pupal weight of male but not of female, and significantly delayed the oviposition period and longevity of adult FAW. In the FAW offspring generation, sublethal concentrations significantly increased the mortality of offspring pupae and pre-adults, and reduced the development time of offspring larvae and pre-adult male and female. Sublethal concentrations $(LC_{10}$ and $LC_{20}$) of EMB significantly decreased the FAW oviposition period. However, only $LC_{10}$ significantly reduced FAW $F_{1}$ female fecundity. No significant difference was found in the intrinsic rates of natural increase $(r_{m}$), finite rate of population increase (λ), and net reproductive rate $(R_{0}$) of FAW offspring exposed to sublethal concentrations. This is the first study to determine the sublethal concentrations of EMB on the life table parameters of two FAW generations. These findings can provide important implications for the rational utilization of FAW insecticides. |
| Starting Page | 959 |
| e-ISSN | 20770472 |
| DOI | 10.3390/agriculture12070959 |
| Journal | Agriculture |
| Issue Number | 7 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-07-03 |
| Access Restriction | Open |
| Subject Keyword | Agriculture Entomology Lethality Determination Life Table Generation Longevity Fecundity |
| Content Type | Text |
| Resource Type | Article |
