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All Journal JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Ankardiansyah Pandu Pradana
Plant Protection Study Program, Faculty of Agriculture, Universitas Jember, East Java, Indonesia 68121
Agriculture, Biological Sciences & Forestry

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Efficacy analysis of nano-insecticides from essential oils in controlling Sitophilus oryzae L. (Coleoptera: Curculionidae) in stored rice Mohammad Hoesain; Anita Firnanda; Nanang Tri Haryadi; Sri Wahyuningsih; Fariz Kustiawan Alfarisy; Muh Adiwena; Ankardiansyah Pandu Pradana
Jurnal Hama dan Penyakit Tumbuhan Tropika Vol. 26 No. 1 (2026): MARCH, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA: JOURNAL OF TROPICAL PLANT PE
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jhptt.1261-13

Abstract

This study evaluated nano-insecticides formulated from essential oils of mint (Mentha piperita), lemongrass (Cymbopogon citratus), basil (Ocimum basilicum), and eucalyptus (Eucalyptus sp.) for controlling Sitophilus oryzae, a major pest of stored rice. Essential oils were extracted using hydrodistillation, and nanoemulsions were prepared via a low-energy method. Efficacy tests conducted at concentrations of 1–5% showed that mint and lemongrass nano-insecticides were the most effective, achieving 100% mortality at 5% concentration within 168 hours and exhibiting superior repellency (mint oil reached 100% repellency at 5%). At 5% concentration, mint oil caused 25% mortality after 24 hours, increasing to 86% by 96 hours and reaching 100% by 120 hours, while lemongrass oil induced 10% mortality at 24 hours, 76% by 96 hours, and 100% by 144 hours. Their high efficacy is attributed to bioactive compounds such as menthol and citral, which disrupt the pest’s physiological processes. In contrast, eucalyptus and basil oils demonstrated comparatively lower mortality and repellency. These results highlight the potential of mint and lemongrass nano-insecticides as eco-friendly alternatives to synthetic pesticides and provide a sustainable option for integrated pest management in stored rice.
Enhanced nematicidal potential of MnCl2-fortified Bacillus sp. cell-free supernatant against Meloidogyne incognita Dyah Retno Anggraini; Dyah Ayu Savitri; Mochammad Wildan Jadmiko; Sofia Sofia; Sudarko Sudarko; Yuli Hariyati; Khaerani Nurlaelita; Ankardiansyah Pandu Pradana
Jurnal Hama dan Penyakit Tumbuhan Tropika Vol. 26 No. 2 (2026): SEPTEMBER, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA: JOURNAL OF TROPICAL PLAN
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jhptt.226327-341

Abstract

Meloidogyne incognita causes major yield losses, underscoring the need for sustainable control strategies. This study is the first to demonstrate that micronutrient fortification and pH modulation of Bacillus sp. SK07 cultures enhance the nematicidal activity of their cell-free supernatant (CFS) and alter metabolite composition. Bacillus sp. SK07 was cultured in Nutrient Broth supplemented with MnCl2 at 0, 50, or 75 ppm, with pH adjusted to 6 or 8. A 10% (v/v) CFS was evaluated in vitro against eggs and second-stage juveniles (J2) over 7 days using a completely randomized design with five treatments and five replicates. The most effective treatment—50 ppm MnCl2 at pH 8—resulted in 96.4% egg-hatch inhibition and 63.6% J2 mortality at 168 hours, significantly higher than the unfortified control (91.8% and 49.4%, respectively). Chemical analysis revealed substantial changes in metabolite composition: unfortified cultures exhibited 9 peaks, whereas the optimized treatment produced 27 peaks, indicating increased chemical diversity. Several bioactive compounds, including fatty acid derivatives and aromatic esters, were identified. These compounds belong to diverse chemical classes such as acids, esters, alcohols, and hydrocarbons, many of which are known for their nematicidal activity. These findings demonstrate that MnCl2 fortification at pH 8 effectively enhanced the bioactivity of Bacillus sp. SK07, offering a promising and sustainable approach for managing M. incognita.
Co-Authors Anita Firnanda Dyah Ayu Savitri Dyah Retno Anggraini Fariz Kustiawan Alfarisy Khaerani Nurlaelita Mochammad Wildan Jadmiko Mohammad Hoesain Muh Adiwena Nanang Tri Haryadi Sofia Sofia Sri Wahyuningsih Sudarko Sudarko Yuli Hariyati