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1- Department of Plant Protection, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
2- Department of Plant Protection, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran. , m.ziaee@scu.ac.ir
Abstract:   (130 Views)
Diatomaceous earth (DE) has long been used for on-farm grain storage hygiene and structural treatment. Structural treatments by DE could control any remaining insect pests in storage. In this study, the residual toxicity of different DE formulations was investigated against adults of Rhyzopertha dominica (F.) (Coleoptera: Bostrychidae) and Tribolium confusum Jacquelin du Val (Coleoptera: Tenebrionidae) on different surfaces including concrete, galvanized steel and mosaic. The surfaces were treated with 0.2 mg.cm-2 concentration of DE formulations including SilicoSec®, Protect-It, and Iranian Mamaghan DE deposit. Silica gel was added to Iranian Mamaghan DE in order to enhance the effectiveness of the DE. The residual toxicity of DEs was assessed at 7, 15, 30, 45 and 60 days post-treatment. The mortality was counted after 1, 3, 5 and 7 days of insects’ exposure to each surface. The mortality percentage increased with increasing DE concentration and exposure time. According to the results, SilicoSec® had greatest persistence compared to the DE Protect-It and Mamaghan. The toxicity and persistence of DE formations were higher in galvanized steel than concrete and mosaic. Application of Mamaghan DE containing 10% silica gel is recommended for the control of R. dominica and T. confusum in silos and warehouses; although additional studies are needed to confirm these findings.
     
Article Type: Original Research | Subject: Toxicology
Received: 2020/02/11 | Accepted: 2020/07/20

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