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<p>Copper nanoparticles (CuNPs) containing leaf extract of <i>Curcuma caesia</i> Roxb. showed antifungal activity against <i>Colletotrichum capsici.</i> The maximum mycelial growth inhibition (63.93%) was observed at 500&#xa0;ppm CuNP. The compatibility of CuNP with biological control agents (<i>Trichoderma harzianum</i>, <i>Beauveria bassiana</i>, <i>Metarhizium robertsii</i><i>, </i><i>Lecanicillium lecanii</i> and <i>Pseudomonas fluorescens</i>) was tested and were found to be compatible up to 500&#xa0;ppm<i>.</i> A field trial was conducted for two consecutive seasons during the year 2021–22 and 2022–23 to evaluate the effect of CuNPs (100&#xa0;ppm) as a component of IDM for the management of leaf spot disease of turmeric in Meghalaya. The results reported that T<sub>6</sub> (Rhizome treatment with CuNPs @ 100&#xa0;ppm + foliar spray with CuNPs @ 100&#xa0;ppm, at 21&#xa0;days interval) developed the lowest disease severity (34.40%), the highest germination percentage (99.80%) and plant growth promotion activity. The IDM module also enhanced the soil biological index of the rhizospheric soil in the experimental field. The reduction in disease severity in T<sub>6</sub> was further supported by the biochemical and enzymatic assays. The treatment T<sub>6</sub> resulted in an increase of total soluble protein (5.56&#xa0;µg/ml), total soluble sugar (2.41&#xa0;µg/ml), flavonoid (208&#xa0;µg/ml), phenol (0.57&#xa0;µg/ml) and terpenoids (13.83&#xa0;µg/ml). The antioxidant enzymatic activity (POD (0.713 unit/ml), PAL (0.032 unit/ml), CAT (0.017 unit/ml), nitrate reductase (1.067 µmolNO2g<sup>−1</sup>FWh<sup>−1</sup>)) was also found highest in T<sub>6</sub> with lowest membrane lipid peroxidation (MDA: 21.07&#xa0;µM/ml). Thus, the present study showed that CuNPs at 100&#xa0;ppm applied as rhizome treatment and foliar spray can be used to manage leaf spot disease of turmeric.</p>

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Effect of copper nanoparticles as a component of IDM module for the management of leaf spot disease of turmeric caused by Colletotrichum capsici (Syd.) Butler and Bisby

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Arti Kumari,
  • Pranab Dutta

摘要

Copper nanoparticles (CuNPs) containing leaf extract of Curcuma caesia Roxb. showed antifungal activity against Colletotrichum capsici. The maximum mycelial growth inhibition (63.93%) was observed at 500 ppm CuNP. The compatibility of CuNP with biological control agents (Trichoderma harzianum, Beauveria bassiana, Metarhizium robertsii, Lecanicillium lecanii and Pseudomonas fluorescens) was tested and were found to be compatible up to 500 ppm. A field trial was conducted for two consecutive seasons during the year 2021–22 and 2022–23 to evaluate the effect of CuNPs (100 ppm) as a component of IDM for the management of leaf spot disease of turmeric in Meghalaya. The results reported that T6 (Rhizome treatment with CuNPs @ 100 ppm + foliar spray with CuNPs @ 100 ppm, at 21 days interval) developed the lowest disease severity (34.40%), the highest germination percentage (99.80%) and plant growth promotion activity. The IDM module also enhanced the soil biological index of the rhizospheric soil in the experimental field. The reduction in disease severity in T6 was further supported by the biochemical and enzymatic assays. The treatment T6 resulted in an increase of total soluble protein (5.56 µg/ml), total soluble sugar (2.41 µg/ml), flavonoid (208 µg/ml), phenol (0.57 µg/ml) and terpenoids (13.83 µg/ml). The antioxidant enzymatic activity (POD (0.713 unit/ml), PAL (0.032 unit/ml), CAT (0.017 unit/ml), nitrate reductase (1.067 µmolNO2g−1FWh−1)) was also found highest in T6 with lowest membrane lipid peroxidation (MDA: 21.07 µM/ml). Thus, the present study showed that CuNPs at 100 ppm applied as rhizome treatment and foliar spray can be used to manage leaf spot disease of turmeric.