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INDONESIA
JPT : JURNAL PROTEKSI TANAMAN (JOURNAL OF PLANT PROTECTION)
Published by Universitas Andalas
ISSN : 25800604     EISSN : 26213141     DOI : -
Core Subject : Agriculture, Social,
Agriculture, Biological Sciences & Forestry Environmental Science
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol. 9 No. 1 (2025): June 2025" : 6 Documents clear
Endophytic Bacteria Consortia as Biocontrol Against Brown Spot Disease (Helminthosporium oryzae) and Growth Promotion in Rice Sulyanti, Eri; Resti, Zurai; Rahma, Haliatur; Darnetty, Darnetty; Khairul, Ujang; Nurhaliza, Nurhaliza; Oktaviani, Silvia
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.9.1.1-13.2025

Abstract

The brown spot disease (BSD) caused by Helminthosporium oryzae in rice can lead to yield losses of up to 45 %. Using endophytic bacterial consortia as a biological agent is one of the most potential control methods for resisting the disease. This study aimed to obtain an endophytic bacterial consortium with the best efficacy in controlling BSD and its ability to enhance rice plant growth. Statistical analysis in this study was made using Analysis of Variance (ANOVA) with Duncan’s Multiple Range Test (DMRT) in a randomized experimental design comprising five treatments with five replications. The treatments included: A (Serratia marcescens ULG1E4 + S. marcescens JB1E3), B (S. marcescens ULG1E4 + S. marcescens JB1E3 + Serratia marcescens JB1E2), C (Bacillus sp. SJI + Serratia marcescens ULG1E4), D (positive control), and E (negative control). Testing was conducted in planta, with the introduction of the bacterial consortium (10⁸ cells/mL) via seed and root soaking methods. Subsequently, the leaves of 30-day-old rice plants were inoculated with H. oryzae by spraying a conidial suspension of 10⁶ conidia/ml. Parameters observed included disease progression (incubation period, incidence, and severity), seedling growth metrics (height, leaf number, root length, fresh and dry biomass), and overall plant development (plant height, leaf number, and tiller count). The results demonstrated that the consortium of Serratia marcescens ULG1E4, Serratia marcescens JB1E3, and Serratia marcescens JB1E2 effectively controlled BSD, achieving a 53.69% reduction in disease severity and promoted rice plant growth, evidenced by a 30.63% increase in leaf number
Toxicity and Developmental Disruption of Piper aduncum Nanoemulsion against Paracoccus marginatus under Laboratory Conditions Andini, Mega; Lina, Eka Candra; Nelly, Novri
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.
Jenis dan Tingkat Parasitasi Parasitoid Telur Spodoptera frugiperda pada Fase Vegetatif Tanaman Jagung Solihin, Angry Pratama; Suwatan, Silvany; Husain, Indriati
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.9.1.38-47.2025

Abstract

The fall armyworm (Spodoptera frugiperda, Lepidoptera: Noctuidae) is an invasive pest that threatens maize production in Indonesia, particularly during the vegetative stage. This study aimed to identify egg parasitoid species and assess their parasitism levels on S. frugiperda during this critical growth phase in Gorontalo, Indonesia. Field sampling was conducted from February to April 2021 using random sampling of egg masses at three maize fields in Suwawa District. The collected eggs were incubated in the laboratory to observe emergence and identify parasitoids. This study revealed the significant contribution of egg parasitoids—particularly Telenomus sp.—in suppressing S. frugiperda populations during the vegetative stage of maize in Gorontalo, Indonesia. Parasitism rates were remarkably high across all observation periods, ranging from 83.82% to 92.54%, and the emergence of Telenomus sp. consistently exceeded that of Trichogramma sp. These findings demonstrate that native egg parasitoids are already actively controlling S. frugiperda in the field and should be preserved through ecologically sensitive pest management. Avoiding insecticide use during early maize growth stages is essential to maintaining the activity of beneficial parasitoids.
Potential of Nematophagous Fungi from Kutalimbaru, North Sumatra, Indonesia, as Biological Control Agents to Manage Root Knot Nematodes, Meloidogyne incognita Simanjuntak, Wira Risa Lina; Hastuti, Liana Dwi Sri; Yurnaliza, Yurnaliza
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.9.1.26-37.2025

Abstract

Root-knot nematodes (RKN), especially Meloidogyne incognita, are one of the most damaging and widespread plant-parasitic nematodes (PPNs) in cultivated plants worldwide. The intensive application of chemical nematicides in controlling these pests raises environmental and ecological concerns, prompting the need for sustainable alternatives. This study aimed to isolate and evaluate the predatory potential of indigenous nematode-trapping fungi (NTF) from the rhizosphere soils of healthy tomato plants against M. incognita under in vitro conditions. Soil samples were processed using the soil sprinkle technique, and fungal isolates capable of forming traps were screened by exposing them to second-stage juvenile (J2) of M. incognita. This study isolated 20 nematophagous fungi that have antagonistic activity against M. incognita from the rhizosphere soil of tomato plants. Among these, four isolates were identified as nematode-trapping fungi, with TRK 04 showing the highest predation efficacy, followed by TRK 07, TRK 09, and TRK 16. All four isolates were identified as part of the Arthrobotrys genus. These findings highlight the potential of indigenous nematophagous fungi as sustainable biocontrol agents for managing root-knot nematodes. Their application could support the development of environmentally friendly agricultural practices and reduce reliance on chemical nematicides. Further, in vivo studies are recommended to validate their efficacy under field conditions.
Potential of Novel Bacteria from Sidoarjo Hot Mud for Controlling Potato Soft Rot Caused by Erwinia carotovora Muhidin, Ahmad; Hapsari, Femita; Qurata Aini, Luqman; Akhid Syib’li, Muhammad; Rizkyta Kusuma, Restu
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.9.1.58-71.2025

Abstract

Soft rot is an important potato disease caused by the bacterial pathogen Erwinia carotovora. Although chemical bactericides are commonly used for control, biological control using antagonistic bacteria offers a promising and environmentally friendly alternative. Bacteria capable of surviving in extreme environments have been reported to show high efficiency and the ability to withstand various environmental conditions. This study aimed to isolate, evaluate the potential and activity, and identify the molecular basis of novel bacteria from Sidoarjo hot mud against E. carotovora, the causal agent of potato soft rot. The methods used included sample collection, bacterial isolation and screening, inhibition assays against E. carotovora, soft rot suppression assays on potato tubers, molecular identification using 16S rRNA gene sequencing, and antibiosis mechanism testing. Based on the research, 16 bacterial isolates were obtained, of which four isolates (BLS3, BLS6, BLS7, and BLS10) demonstrated antagonistic activity, as evidenced by the formation of clear inhibition zones on nutrient agar medium. Suppression assays further confirmed their ability to significantly reduce soft rot symptoms in potato tubers. Among these, BLS10 isolate exhibited the highest inhibition and suppression activity, with an inhibition zone of 2.03 cm and a soft rot mass of 0.52 grams. Molecular identification based on 16S rRNA gene sequencing showed that isolates of BLS3, BLS6, BLS7, and BLS10 were identified respectively as Bacillus velezensis, Bacillus methylotrophicus, Bacillus amyloliquefaciens, and Ochrobactrum intermedium. All isolates demonstrated a bacteriostatic antibiosis mechanism, indicated by turbidity in peptone water, suggesting inhibition through secondary metabolite production.
Potential of PGPR from Rhizospheric Grass in Bromo Tengger Semeru National Park, Indonesia, against Xanthomonas oryzae pv. oryzae Hapsari, Femita; Muhidin, Ahmad; Aini, Luqman Qurata; Rachmawati, Rina
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.9.1.14-25.2025

Abstract

Bacterial leaf blight (BLB), caused by Xanthomonas oryzae pv. oryzae (Xoo), is one of the most destructive diseases affecting rice, resulting in significant yield losses and reduced grain quality. The overuse of chemical bactericides has raised environmental concerns and contributed to the emergence of resistant pathogen strains, emphasizing the need for sustainable alternatives. Plant Growth-Promoting Rhizobacteria (PGPR) offer a promising alternative due to their dual role in enhancing plant growth and suppressing phytopathogens. This study aimed to isolate and characterize PGPR from the rhizosphere of Imperata cylindrica, a grass species thriving in the extreme sand sea environment of Bromo Tengger Semeru National Park (BTSNP), Indonesia. The sampling site represents a unique volcanic soil ecosystem characterized by sandy texture, high surface temperatures, and nutrient-poor conditions, with no vegetation other than I. cylindrica. These extreme environmental conditions suggest that the associated microbial communities may be highly adapted to abiotic stress and possess valuable traits for plant growth promotion and pathogen suppression. A total of 46 rhizobacterial isolates were obtained, of which five (Isolates 5, 6, 8, 10, and 12) demonstrated nitrogen-fixing ability, phosphate-solubilizing activity, and strong antagonism against Xoo. Morphological, physiological, and biochemical analyses identified Isolates 5, 8, and 12 as Pantoea spp., while Isolates 6 and 10 were classified as Erwinia spp. In vitro inhibition assays revealed that Isolate 6 exhibited the highest antagonistic activity, comparable to streptomycin, and was categorized as "Very Strong." These findings highlight Isolate 6 as a promising candidate for development as a biological control agent for sustainable rice disease management.

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