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All Journal Planta Tropika International Journal on Food, Agriculture and Natural Resources (IJFANRES)
Indrawan, Arga Dwi
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Agriculture, Biological Sciences & Forestry

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The Potency of Streptomyces spp. from Shallot Land as Entomopathogen of Onion Caterpillar Pest Spodoptera exigua Pratista, Ariq Dies; Windriyanti, Wiwin; Suryaminarsih, Penta; Mujoko, Tri; Indrawan, Arga Dwi; Harsiyanti, Harsiyanti
International Journal on Food, Agriculture and Natural Resources Vol 6, No 4 (2025): IJ-FANRES
Publisher : Food, Agriculture and Natural Resources - NETWORKS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46676/ij-fanres.v6i4.569

Abstract

Spodoptera exigua is a major pest of shallots (Allium ascalonicum L.), capable of causing up to 100% yield loss if uncontrolled. Streptomyces sp. is a soil-dwelling Actinomycetes bacterium that can be used to control S. exigua. This study aimed to determine the potential of Streptomyces spp. isolates from shallot fields as an entomopathogen against S. exigua. The research employed a Factorial Complete Randomized Design (CRD). The first factor consisted of one Streptomyces spp. isolate obtained from the Pare-Kediri region (BMP) and three isolates from Sidera-Palu (BMS1, BMS2, and BMS3). The second factor was the concentration of the Streptomyces sp. suspension consist of 0%; 5%; 10%; and 15% with three replication per treatment (48 units total). Data on larval mortality and damage intensity were analyzed using RStudio via ANOVA and DMRT (α=5%). The BMP (15%) treatment demonstrated the highest efficacy, achieving 76.67% larval mortality while maintaining the lowest damage intensity of 0.20% on shallot plants. These results highlight BMP isolate at 15% concentration as the most promising biocontrol agent and support its further field evaluation as a sustainable alternative to chemical insecticides.
Biocontrol Strategies Using Streptomyces spp. and Trichoderma spp. against the Sugarcane Smut Pathogen Sporisorium scitamineum: An in Vitro Study Indrawan, Arga Dwi; Raharjo, Laksamana Agadhia; Rahmadhini, Noni
PLANTA TROPIKA Vol. 14 No. 1 (2026)
Publisher : Department of Agrotechnology, Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/pt.v14i1.21414

Abstract

Sporisorium scitamineum is a Basidiomycota pathogen that causes smut disease in sugarcane plants. The pathogen can infect all types of sugarcane, with the extent of damage depending on the plant's susceptibility. Farmers rely on chemical pesticides to control S. scitamineum , but these pesticides have negative environmental impacts. Using Trichoderma sp. and Streptomyces sp. as biocontrol has been proven against fungal infections and is safe for the environment. This study evaluated the potential of Trichoderma sp. and Streptomyces sp. against S. scitamineum under in vitro conditions. Each of the three isolates of Trichoderma sp. and Streptomyces sp. was assessed using the VOC (Volatile Organic Compound), chitinase enzyme, and in vitro antagonistic assays. The results indicated that Streptomyces spp. demonstrated higher chitinase activity compared to Trichoderma spp., with isolate ST1 having the highest chitinase index at 3.7%. VOC test demonstrated that Streptomyces spp. markedly inhibited the mycelial growth of S. scitamineum, attaining inhibition rates of up to 82%. Conversely, Trichoderma spp. exhibited enhanced antagonistic activity via direct interaction, with isolate TD2 suppressing pathogen growth by 82% in dual-culture assays. The findings show that Streptomyces spp. and Trichoderma spp. suppressed S. scitamineum in different but complementary ways. The study shows that they could be used as environmentally friendly biological control agents to manage sugarcane smut.
Co-Authors Harsiyanti, Harsiyanti Noni Rahmadhini Penta SURYAMINARSIH Pratista, Ariq Dies Raharjo, Laksamana Agadhia Tri MUJOKO Windriyanti, Wiwin