Efficacy of three insecticides against German cockroach, Blattella germanica


  • Esayas Kinfe Ethiopian Public Health Institute Author
  • Yonas Wuletaw Ethiopian Public Health Institute Author
  • Fitsum Tesfaye Ethiopian Public Health Institute Author
  • Sintayehu Abate Ethiopian Public Health Institute Author
  • Yebeltal Asefa Ethiopian Public Health Institute Author




Cockroach, Fipronil, Hydramethylnon, Boric acid, lethal time, Toxicity, Ethiopia


Background: Arthropod adaptability joined with ecological and climate change combined with frequent air travel, ensures that vector-borne diseases continue to be a problem for humankind. Cockroaches are among the most important residential, commercial, institutional, and industrial pests today all over the world including Ethiopia.

Methods: Efficacy of fipronil gel, boric acid and hydramethylnon baits were evaluated against German cockroach,

Blattella germanica, in the Ethiopian Public Health Institute’s laboratory.

Result: Fipronil gel bait was significantly more toxic and caused fast action with higher mortality of Blattella germanica than boric acid and hydramethylnon baits. The overall mortality of B. germanica due to exposure to fipronil, hydramethylnon and boric acid at the end of the experimental 14 days test were 96.5, 93.4 and 84.6 %, respectively. Although all the baits were toxic to adult males and females of B. germanica at all rates, the result of oral toxicity against this species varied by developmental stage. To this effect, fipronil caused higher nymphal death than the two baits. The median lethal time (LT50s) were 0.8, 2.4, and 7.6 days for fipronil, hydramethylnon and boric acid baits, respectively. In terms of attraction, B. germanica was more attracted to fipronil than hydramethylnon and boric acid baits.

Conclusion It was observed that fipronil is the most effective insecticide against B. germanica than boric acid and hydramethylnon.


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Author Biographies

  • Esayas Kinfe, Ethiopian Public Health Institute

    Ethiopian Public Health Institute 

  • Yonas Wuletaw, Ethiopian Public Health Institute

    Ethiopian Public Health Institute

  • Fitsum Tesfaye, Ethiopian Public Health Institute

    Ethiopian Public Health Institute

  • Sintayehu Abate, Ethiopian Public Health Institute

    Ethiopian Public Health Institute

  • Yebeltal Asefa, Ethiopian Public Health Institute

    Ethiopian Public Health Institute


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Original Article

How to Cite

Kinfe, E. (2023) “Efficacy of three insecticides against German cockroach, Blattella germanica”, Ethiopian Journal of Public Health and Nutrition (EJPHN), 6(1), pp. 56–64. doi:10.20372/ejphn.v6i1.362.

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