Study on the killing effect of diatomaceous earth on Blattella germanica
CHEN Hongna
ZHANG Yufu
WU Zhiming
YANG Weifang
CHU Hongliang
Abstract：Objective To evaluates the efficacy of diatomaceous earth(DE)on Blattella germanica.Methods Under laboratory conditions,forced contact experiments and chain-killing experiments were conducted to assess the insecticidal effects of DE.Results Experimental results showed that there was a significant dose-response relationship between the application dose of DE and mortality.When the application dose was 2 g/m2,the mortality rate reached 100%within 48 hours,while increasing the dose to 3 g/m2 resulted in complete extermination within 24 hours.The chain-killing experiments demonstrated that when the ratio of DE-contaminated donor cockroaches and uncontaminated recipient cockroaches was≥5∶1,the 48-hour mortality rate of recipients reached 50%,confirming the chain-killing effect of DE.DE demonstrates effective control against B.germanica within a relative humidity range of 55%to 84%,achieving a mortality of 100%within 8 hours.Residual efficacy tests indicated that DE retained strong insecticidal activity for up to 60 days post-application,with all cockroaches succumbing within 12 hours of exposure.Conclusion DE exhibits highly efficient and persistent cockroach-killing properties under different humidity conditions.It is of environmentally friendliness and non-resistance risks,providing an innovative solution for establishing sustainable integrated cockroach management strategies.
Keywords：diatomaceous earthBlattella germanicaphysical controlchain-killing
Publication Date：2025-12-20
Online Publishing Date：2026-01-09(First online date of this platform, not the publication date of the document)
Pages：4( 659-662 )