Persistence and Effectiveness of Diatomaceous Earth and Spinosad® Against Sitophilus zeamais (Coleoptera: Curculionidae) on Stored Rice

NJE Vol. 36: 113-117, 2020


Nwanade, C.F.,1* Kemabonta, K.A.,2 Odediya, O.T.2,3 

1Nigerian Stored Products Research Institute, Yaba, Lagos, Nigeria
2Department of Zoology, University of Lagos, Akoka, Lagos
3Federal College of Education (Technical) Akoka, Lagos


The insecticidal and residual effectiveness of Diatomaceous Earth (DE) (Nigeria-derived) and Spinosad® against Sitophilus zeamais on stored rice were evaluated under laboratory temperature (30 ± 2°C) and relative humidity (70 ± 5%). Adult mortality and progeny emergence were studied at three dose rates of DE and Spinosad® (0.1g/kg, 0.5g/kg, and 1g/kg). Spinosad® at 0.1-1.0 g/kg dose rates demonstrated significant results in mortality compared to DE and control groups at 14 d post-treatment and after the 2nd month of storage treatment. Spinosad® treated grains at the same dose rates also resulted in a significant reduction (P<0.05) in the emergence of progeny. Unlike DE, Spinosad® showed some insecticidal efficacy against S. zeamais on storage.

Keywords: Insecticidal, Residual, Adult mortality and Progeny emergence.

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