Journal of Arthropod-Borne Diseases 2016. 10(3):337-348.

Biocontrol of the Brown-banded Cockroach, Supella longipalpa F. (Blattaria: Blattellidae), with Entomopathogenic Fungus, Metharhizium anisopliae
Mona Sharififard, Mohammad Saeed Mossadegh, Babak Vazirianzadeh, Seyed Mahmood Latifi

Abstract


Background: Considering to the high distribution of cockroaches as urban pests, the efficacy of different formula­tions of Metarhizium anisopliae strain Iran 437C were assessed against the brown-banded cockroach, Supella longi­palpa F. under laboratory and field conditions.
Methods:
Metarhizium anisopliae isolates were screened with immersing adults of the brown-banded cockroachs in aqueous suspension of 108 conidia ml-1 followed by surface or bait treated with different doses of the most virulent isolate against the nymphs. Then formulations of conidia oil-in-water were examined versus cockroach nymphs us­ing different plant oils and paraffin. Then they were evaluated and compared with aqueous suspension and control group. On a large-scale, the sunflower oil-in-water formulation of conidia was sprayed at houses using a hand sprayer.
Results:
Metarhizium anisopliae IRAN 437C was the most virulent isolate against the brown-banded cockroach, causing 100% mortality in adults at seven days post-exposure. Inoculated bait with this isolate was not enough path­ogenic against the cockroach even at two weeks after treatment. Treated surface with conidia as aqueous suspension or oil-in- water formulation was more effective than the bait formulation against the cockroach caused 39.4–97.2% mortality compared with 2.5% mortality in control group after two days. Spraying the conidia formulated with sun­flower oil was an effective formulation causing 76.1% reduction in the cockroach density on the third day post treatment in the houses.
Conclusion: The oil-in-water formulation of M. anisopliae IRAN 437C could be recommended as a promising al­ternative for cockroach control.  


Keywords


Supella longipalpa; Metarhizium anisopliae; Entomopathogenic fungus; Biocontrol

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