Insecticidal efficiency and safety of zinc oxide and hydrophilic silica nanoparticles against some stored seed insects
Samia Ali Haroun 1, A,D-F,   Mahmoud Elsaid Elnaggar 2, A,D-F,   Doaa Mohamed Zein 3, A,C-F  
,   Rehab Ibrahim Gad 2, B-D
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Botany Department, Science Faculty, Mansoura University, Mansoura, Egypt
Cotton and Crops Mites Department, Plant Protection Research Institute, Giza, Egypt
Stored Products and Cereals Department, Plant Protection Research Institute, Giza, Egypt
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
Doaa Mohamed Zein   

Stored Products and Cereals Department, Plant Protection Research Institute, Giza, Egypt
Submission date: 2019-04-21
Acceptance date: 2019-10-07
Online publication date: 2020-04-03
Journal of Plant Protection Research 2020;60(1):77–85
The present study was conducted to evaluate the insecticidal efficiency and safety of zinc oxide nanoparticles (ZnO NPs) and hydrophilic silica nanoparticles (SiO2 NPs) against: adults of rice weevil (Sitophilus oryzae L.); red flour beetle (Tribolium castaneum Herbst.) and cowpea beetle (Callosobruchus maculatus F.) results showed that, both ZnO NPs and hydrophilic SiO2 NPs exhibited a significant toxic effect (df, F and p < 0.5) against S. oryzae and C. maculatus at the highest concentration while T. castaneum showed high resistance against the two tested materials. At the end of the experiment, recorded mortality was: 81.6, 98.3 and 58.3% at the highest concentration used for each insect (0.3, 2 and 8 gm ⋅ kg–1 of SNPs with C. maculatus, S. oryzae and T. castaneum, respectively), while mortality was 88.3, 100 and 38.3% at the highest concentration used for each insect (0.6, 2.5 and 8 gm ⋅ kg–1 of ZnO NPs with C. maculatus, S. oryzae and T. castaneum, respectively). Both tested materials caused high reductions in F1-progeny (%) with C. maculatus and S. oryzae. Histopathological examination of male mice livers showed hepatic architecture with congested blood sinusoids, binucleated hepatocytes nuclei, dilated central vein and margainated chromatin in some nuclei. Histopathological assessment of the lungs showed normal histoarchitecture. There were no differences in alveolar septa, bronchiolar and epithelium of the treated and untreated animals. Silica and zinc oxide nanoparticles have a good potential to be used as stored seed protectant alternatives if applied with proper safety precautions.
The authors have declared that no conflict of interests exist.
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