Comparative efficacy of insecticide products for control of German cockroaches (Blattella germanica)
Bioefficacy of four selected insecticidal products used for cockroach control was conducted against adult females of the German cockroaches (Blattella germanica) to determine contact toxicity rates. Test substances were cypermethrin 25% w/v EC, chlorpyrifos 40% w/v EC, fipronil 5% w/v SC, and chlorfenapyr 24% w/v SC tested at dosages of 0.1, 0.25, 0.1 and 0.25 g a.i./m2, respectively. Treatment rates were determined according to World Health Organization (WHO) testing recommendations or product label instructions. These products were tested separately against B. germanica using surface contact exposure method. Test cockroaches were exposed to insecticide treated 20 cm2 glass sheet with 4 separate exposure events at 5, 10, 30, and 60 minutes. Both cypermethrin and fipronil were highly effective against B. germanica, providing quick knockdown and killing actions after a 5-minute exposure to the insecticide treated panels with 4.27 and 3.87 minute KT50 values respectively, resulting in 100% mortality. Chlorfenapyr required a 10-minute exposure to achieve 100% mortality with KT50 value of 9.46 minutes, whereas chlorpyrifos required 30 minutes to achieve 100% mortality but the KT50 could not be calculated. Toxicity comparison of the four insecticidal products tested against B. germanica decreased in the order of fipronil ~ cypermethrin > chlorphenapyr > chlorpyrifos.
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