Insecticidal effectiveness of certain bio-insecticides, inert dusts and modified atmospheres against <i>Sitophilus oryzae</i> (L.) (Coleoptera: Curculionidae) on stored wheat
2013
Zidan, Nour El-Hoda A.
Efficacy of three bio-insecticides (i.e. Spinosad, <i>Beauveria bassiana</i> and <i>Metarhizium anisopliae</i>), three inert dusts (i.e. diatomaceous earth, sugar beet wastes and sawdust) and modified atmospheres as alternatives to methyl bromide against adults <i>Sitophilus oryzae</i> on wheat was investigated in laboratory bioassays. Results showed that spinosad was the most effective bio-insecticide against <i>S. oryzae</i> at all exposure periods. Likewise, diatomaceous earth caused the highest mortality percentage compared to the other tested inert dusts. A three and five days exposure periods were adequate to completely kill <i>S. oryzae</i> under modified atmospheres containing 80% and (40 and 60%) CO<sub>2</sub> gas in the air, respectively. Therefore, spinosad, diatomaceous earth and modified atmospheres could be consider eco-friendly control methods and promising alternatives to conventional pesticides, as they have low mammalian toxicity and low or zero residual effects in food.
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