Scholarlink

<p><i>Helicoverpa armigera</i> (Lepidoptera: Noctuidae) is the most destructive agricultural insect pest, causing yield losses across diverse crops worldwide. The use of chemical pesticides caused environmental pollution, insecticide resistance, residue accumulation, and many other adverse effects on living and non-target organisms. So, the development and application of eco-friendly and effective pest management strategies are necessary. In the present investigation, the insecticidal properties of nitrogen-doped titanium dioxide nanoparticles (N-TiO₂ NPs) with a fixed nitrogen-doping concentration of 0.7&#xa0;mol%, synthesized via auto-combustion sol-gel technique, were estimated against 2nd and 3rd instar larvae of <i>H. armigera</i> under laboratory conditions. The synthesized nanoparticles exhibited a crystallite size of 10–15&#xa0;nm, with an average size of approximately 12.82&#xa0;nm as determined by Rietveld refinement analysis. The larval mortality was evaluated at different concentrations (expressed as mg/L) and exposure periods of 24, 48, 72, 96, and 120&#xa0;h. Mortality data were corrected and then subjected to the arcsine transformation followed by two-factor analysis of variance (ANOVA) to determine the effects of treatment concentration and exposure time. The mean comparisons were done using Duncan’s Multiple Range Test. Furthermore, the median lethal concentration (LC<sub>50</sub>) values were calculated using Probit analysis, and the corresponding 95% confidence interval (CI) was estimated by regression analysis. The results also showed a time and dose-dependent increase in larval mortality. Higher doses of nanoparticles (NPs) created greater mortality compared to the lower doses across all exposure intervals. The calculated LC₅₀ values decreased with increasing exposure time, indicating enhanced toxicity of the NPs with prolonged exposure. The two-factor ANOVA showed that treatment concentration and exposure period have a significant effect (p <b>&lt;</b> 0.001) on larval mortality. The present study showed that N–TiO₂ NPs have insecticidal properties and suggests that these particles may offer a novel strategy to support sustainable agriculture and meet the escalating global food demand associated with an increasing human population. However, further investigations are required to evaluate their impacts on soil microbiota, non-target organisms, and environmental safety before large-scale agricultural application.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Insecticidal potential of nitrogen-doped titanium dioxide nanoparticles against Helicoverpa armigera larvae

  • 期刊论文

  • 发表日期：

    2026年6月2日

查看全文
  • Neelam Thakur,
  • Mehak Thakur,
  • Puneet Negi

摘要

Helicoverpa armigera (Lepidoptera: Noctuidae) is the most destructive agricultural insect pest, causing yield losses across diverse crops worldwide. The use of chemical pesticides caused environmental pollution, insecticide resistance, residue accumulation, and many other adverse effects on living and non-target organisms. So, the development and application of eco-friendly and effective pest management strategies are necessary. In the present investigation, the insecticidal properties of nitrogen-doped titanium dioxide nanoparticles (N-TiO₂ NPs) with a fixed nitrogen-doping concentration of 0.7 mol%, synthesized via auto-combustion sol-gel technique, were estimated against 2nd and 3rd instar larvae of H. armigera under laboratory conditions. The synthesized nanoparticles exhibited a crystallite size of 10–15 nm, with an average size of approximately 12.82 nm as determined by Rietveld refinement analysis. The larval mortality was evaluated at different concentrations (expressed as mg/L) and exposure periods of 24, 48, 72, 96, and 120 h. Mortality data were corrected and then subjected to the arcsine transformation followed by two-factor analysis of variance (ANOVA) to determine the effects of treatment concentration and exposure time. The mean comparisons were done using Duncan’s Multiple Range Test. Furthermore, the median lethal concentration (LC50) values were calculated using Probit analysis, and the corresponding 95% confidence interval (CI) was estimated by regression analysis. The results also showed a time and dose-dependent increase in larval mortality. Higher doses of nanoparticles (NPs) created greater mortality compared to the lower doses across all exposure intervals. The calculated LC₅₀ values decreased with increasing exposure time, indicating enhanced toxicity of the NPs with prolonged exposure. The two-factor ANOVA showed that treatment concentration and exposure period have a significant effect (p < 0.001) on larval mortality. The present study showed that N–TiO₂ NPs have insecticidal properties and suggests that these particles may offer a novel strategy to support sustainable agriculture and meet the escalating global food demand associated with an increasing human population. However, further investigations are required to evaluate their impacts on soil microbiota, non-target organisms, and environmental safety before large-scale agricultural application.