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All Journal JPT : JURNAL PROTEKSI TANAMAN (JOURNAL OF PLANT PROTECTION)
Eka Candra Lina
Universitas Andalas, Indonesia
Agriculture, Biological Sciences & Forestry Environmental Science

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Toxicity and Developmental Disruption of Piper aduncum Nanoemulsion against Paracoccus marginatus under Laboratory Conditions Mega Andini; Eka Candra Lina; Novri Nelly
Jurnal Proteksi Tanaman (Journal of Plant Protection) Vol. 9 No. 1 (2025): June 2025
Publisher : Plant Protection Department, Faculty of Agriculture, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jpt.9.1.48-57.2025

Abstract

Paracoccus marginatus is one of the important pests that can reduce papaya production. Piper aduncum nanoemulsion has potential as a botanical pesticide to control papaya mealybug (Paracoccus marginatus). This present research was aimed to determine the most effective concentration in suppressing the development of P. marginatus. This study consisted of 6 treatments and 5 replications: 0.33%, 0.43%, 0.57%, 0.75%, 0.99%, and control. The observed parameters were: nymph mortality, adult mortality, daily mortality, adult emergence, LC50, and LC95. The data obtained were analyzed using variance (ANOVA) and 5% Tukey. The LC50, and LC95 value was analyzed using Polo Plus. Piper aduncum nanoemulsion exhibits strong insecticidal activity against nymphs and adults of Paracoccus marginatus under laboratory conditions. Among the concentrations tested, 0.99% was the most effective, causing 81.11% nymph mortality at 72 hours post-application; adult emergence was limited to only 13.33%. The LC₅₀ and LC₉₅ values at 72 hours were 0.506% and 1.222%, reflecting the potency of the nanoemulsion at relatively low doses. Further research under field conditions is recommended to evaluate its efficacy, formulation stability, and safety on non-target organisms.
Physiological Interference of Nanoemulsion-Formulated Botanical Insecticide Para-Menthane-3,8-Diol on Spodoptera frugiperda Rayhan Fadhlurrahman; Eka Candra Lina; Novri Nelly
Jurnal Proteksi Tanaman (Journal of Plant Protection) Vol. 9 No. 2 (2025): December 2025
Publisher : Plant Protection Department, Faculty of Agriculture, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jpt.9.2.119-13-.2025

Abstract

Para-menthane-3,8-diol (PMD), derived from citronellal of citronella plants, has potential as an eco-friendly botanical insecticide for controlling Spodoptera frugiperda. This study aimed to evaluate the physiological interference caused by a PMD nanoemulsion formulation on S. frugiperda. Bioassays were conducted using the leaf-dip method. Data were analyzed using analysis of variance (ANOVA), followed by the Least Significant Difference (LSD) test with Statistix 8 and Duncan’s multiple range test at a 5% significance level using SPSS version 25. Probit analysis with POLO PLUS was performed to determine LC₂₅ and LC₅₀ values. The results showed that PMD nanoemulsion induced significant physiological interference in S. frugiperda, as indicated by increased mortality with LC₂₅ and LC₅₀ values of 0.15% and 0.48%, respectively. At a concentration of 0.75%, the treatment disrupted development by reducing pupation and adult emergence to 30% and altering the sex ratio to 1 male: 0.22 female. Sublethal interference was evident through strong antifeedant activity (62.88%) and pronounced changes in physiological parameters, including consumption rate (0.0328 mg/day), growth rate (0.0023 mg/day), and efficiency of ingested food (6.0029 mg/day). Overall, the PMD nanoemulsion formulation interfered with survival, feeding behavior, growth, and developmental physiology of S. frugiperda, highlighting its potential as an eco-friendly botanical insecticide.
Co-Authors Mega Andini NOVRI NELLY Rayhan Fadhlurrahman