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Article

The Effect of Botanical Pesticides Azadirachtin, Celangulin, and Veratramine Exposure on an Invertebrate Species Solenopsis invicta (Hymenoptera: Formicidae)

1
Red Imported Fire Ant Research Center, South China Agricultural University, Guangzhou 510642, China
2
Insect Biodiversity and Biogeography Laboratory, School of Biological Sciences, The University of Hong Kong, Pok Fu Lam Road, Hong Kong SAR, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Submission received: 15 November 2023 / Revised: 10 December 2023 / Accepted: 16 December 2023 / Published: 20 December 2023

Abstract

The injudicious and excessive use of synthetic pesticides has deleterious effects on humans, ecosystems, and biodiversity. As an alternative to traditional crop-protection methods, botanical pesticides are gaining importance. In this research endeavor, we examined the contact toxicity, knockdown time, lethal time, and toxicity horizontal transmission of three natural pesticides from plants (azadirachtin, celangulin, and veratramine) on red imported fire ants (RIFA; Solenopsis invicta). Our research findings indicated that azadirachtin and celangulin exhibited relatively high toxicity, with median lethal dose (LD50) values of 0.200 and 0.046 ng/ant, respectively, whereas veratramine exhibited an LD50 value of 544.610 ng/ant for large workers of S. invicta at 24 h post-treatment. Upon treatment with 0.125 mg/L, the (median lethal time) LT50 values of azadirachtin and celangulin were determined to be 60.410 and 9.905 h, respectively. For veratramine, an LT50 value of 46.967 h was achieved after being tested with 200 mg/L. Remarkably, azadirachtin and celangulin were found to exhibit high horizontal transfer among RIFA, with high secondary mortality (100%) and tertiary mortalities (>61%) after 48 h of treatment with 250 mg/L, as well as with their dust formulations for 72 h. However, veratramine did not exhibit significant toxicity or horizontal transfer effects on RIFA, even at high concentrations. These findings suggest that azadirachtin and celangulin are likely to have a highly prominent potential in the management of S. invicta.
Keywords: botanical pesticides; azadirachtin; celangulin; veratramine; toxicity; red imported fire ant; nontarget organism botanical pesticides; azadirachtin; celangulin; veratramine; toxicity; red imported fire ant; nontarget organism

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MDPI and ACS Style

Liang, Y.; Liang, M.; Chen, H.; Hong, J.; Song, Y.; Yue, K.; Lu, Y. The Effect of Botanical Pesticides Azadirachtin, Celangulin, and Veratramine Exposure on an Invertebrate Species Solenopsis invicta (Hymenoptera: Formicidae). Toxins 2024, 16, 6. https://doi.org/10.3390/toxins16010006

AMA Style

Liang Y, Liang M, Chen H, Hong J, Song Y, Yue K, Lu Y. The Effect of Botanical Pesticides Azadirachtin, Celangulin, and Veratramine Exposure on an Invertebrate Species Solenopsis invicta (Hymenoptera: Formicidae). Toxins. 2024; 16(1):6. https://doi.org/10.3390/toxins16010006

Chicago/Turabian Style

Liang, Yuling, Mingrong Liang, Huimei Chen, Jingxin Hong, Yunbo Song, Kuo Yue, and Yongyue Lu. 2024. "The Effect of Botanical Pesticides Azadirachtin, Celangulin, and Veratramine Exposure on an Invertebrate Species Solenopsis invicta (Hymenoptera: Formicidae)" Toxins 16, no. 1: 6. https://doi.org/10.3390/toxins16010006

APA Style

Liang, Y., Liang, M., Chen, H., Hong, J., Song, Y., Yue, K., & Lu, Y. (2024). The Effect of Botanical Pesticides Azadirachtin, Celangulin, and Veratramine Exposure on an Invertebrate Species Solenopsis invicta (Hymenoptera: Formicidae). Toxins, 16(1), 6. https://doi.org/10.3390/toxins16010006

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