Efficacy of three insecticides against German cockroach, Blattella germanica
DOI:
https://doi.org/10.20372/ejphn.v6i1.362Keywords:
Cockroach, Fipronil, Hydramethylnon, Boric acid, lethal time, Toxicity, EthiopiaAbstract
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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