Toxicity of imidacloprid and chlorpyrifos against German cockroaches Blattella germanica

Research Article

International Journal of One Health, 5: 107-112

https://doi.org/10.14202/IJOH.2019.107-112

Mozhgan Baniardalani¹, Asma Arfa Rahimian¹, Abedin Saghafipour², Hamid Reza Basseri¹, Majid Kababian^1,3, and Jalil Nejati⁴

1. Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
2. Department of Public Health, Faculty of Health, Qom University of Medical Sciences, Qom, Iran.
3. Students' Scientific Research Center, Tehran University of Medical Sciences, Tehran, Iran.
4. Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran.

Background and Aim: As a mechanical vector of some communicable diseases and a self-adaptive species to human environments, the German cockroach can transmit pathogens, such as bacteria, viruses, and fungi, to human beings. This study was conducted to determine the toxicity of imidacloprid and chlorpyrifos against German cockroaches.

Materials and Methods: In this experimental study, the last instar German cockroach nymphs were used to test their sensitivity to imidacloprid and chlorpyrifos insecticides by the contact and bait methods. In bioassay (jar test), the nymphs were isolated from the main colony and were exposed to the insecticides for 30 min. The mortality rate was recorded 24 h after the recovery time. In bioassay (bait), 24-96 h after exposure to the poisonous bait, the mortality rate was recorded and regression analysis was run to analyze the data in the SPSS software (IBM, Chicago, USA).

Results: The lethal doses (LD) of imidacloprid and chlorpyrifos were 9.5 mg/m2 and 39.78 mg/m2, respectively. The LD50 for imidacloprid and chlorpyrifos were 2.66 and 9.92 mg/m2, respectively. Results revealed that the highest concentration of imidacloprid (45%) could cause the highest mortality rate (95%) 24 h after exposure. There is a significant difference in the mortality of the samples during the follow-up period. Moreover, the chlorpyrifos smeared bait, with a concentration of 16% after 24 h, had the highest mortality rate (95%).

Conclusion: The highest mortality rate occurred in the ingestion of imidacloprid smeared bait within the first 48 h after being exposed to the insecticide. Therefore, the results show that imidacloprid can prove significantly effective in controlling cockroaches. Keywords: Blattella germanica, chlorpyrifos, German cockroach, imidacloprid.

Keywords: Blattella germanica, chlorpyrifos, German cockroach, imidacloprid.

How to cite this article: Baniardalani M, Rahimian AA, Saghafipour A, Basseri HR, Kababian M, Nejati J. Toxicity of imidacloprid and chlorpyrifos against German cockroaches Blattella germanica. Int J One Health 2019;5:107-112.

Received: 02-10-2019 Accepted: 04-12-2019 Published online: 30-12-2019

Corresponding author: Majid Kababian E-mail: majid_kbi69@yahoo.com

DOI: 10.14202/IJOH.2019.107-112

Copyright: Baniardalani, et al. This article is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.