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Journal : Cropsaver : Journal of Plant Protection

Competition of biological agents of Streptomyces sp, Gliocladium sp, and Trichoderma harzianum to Fusarium oxysporum in Tomato Rhizophere Penta Suryaminarsih; Tri Mujoko
CROPSAVER Vol 3, No 1 (2020)
Publisher : Departemen Hama dan Penyakit Tumbuhan Fakultas Pertanian Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (233.69 KB) | DOI: 10.24198/cropsaver.v3i1.24173

Abstract

Fusarium oxysporum is a soil-borne fungus that attacks all stages of tomato plant from seedlings to mature plants. The disease occurrence on the tomato nursery can lead economically loss due to its fast and massive damage. Application of effective biological control agents is considered as promising control measure of the disease. The aim of this study was to evaluate the potential competitiveness of biological agents mixture consisting of Streptomyces sp., Gliocladium sp. and T. harzianum against F. oxysporum f. sp. lycopersici in the rhizosphere of the tomato plant. The experiment was arranged in completely randomized design with five treatment types of agents that a single biological agents Streptomyces sp. (S), a mixture of Streptomyces sp. and Gliocladium sp. (SG), a mixture of Streptomyces sp. and T. harzianum (ST), a mixture of Streptomyces sp., Gliocladium sp., and T. harzianum (SGT) and control without biological agents. Each treatment was replicated four times and consisted of 6 plants for observation purposes destructively. Descriptive analysis conducted on the pattern of colonization of the roots competition showed a growth pattern colonization of biological agents, Streptomyces sp, Gliocladium sp, T. harzianum and F. oxysporum pathogen (SGTF) was the same growth pattern of SGF and STF, where four of the microbes grew on the same side of roots as fungal pathogens, in all parts of the root sprouts. Given biological agent Streptomyces sp, Gliocladium sp., dan Trichoderma harzianum decreased fusarium wilt diseases severity of tomato. Weight root of tomato plants was applied by biological agents was 9.2 g greater than  plant without biological agents, which were 2.5 g. The observation on tomato indicated root colonization occurs, especially on the base of the stem-roots by a mixture of biological agents T. harzianum and Gliocladium sp.
Study of Streptomyces spp. to control purple blotch disease caused by Alternaria porri in shallot plant Risdiyanti, Rateh Lailatul; Rahmadhini, Noni; Suryaminarsih, Penta; Mujoko, Tri
CROPSAVER Vol 6, No 1 (2023)
Publisher : Departemen Hama dan Penyakit Tumbuhan Fakultas Pertanian Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cropsaver.v6i1.43647

Abstract

Alternaria porri is a fungal pathogen that causes purple blotch on shallots, this fungus can cause crop yield loss of 3 – 57%. A. porri was obtained from the Sumber Brantas onion farm and then isolated by planting infected tissue. Streptomyces spp. is a filamentous bacterium that is abundant in the soil and can be used as a biological agent, decomposer and plant growth promote. Streptomyces spp. was obtained one isolate from shallot land location in Pare, Kediri, East Java (BMP: Bawang Merah Pare) and three isolates from Sidera, Palu, Central Sulawesi (BMS: Bawang Merah Sidera) (BMS1, BMS2, BMS3). The purpose of this study was to determine the efficacy of Streptomyces spp. to control A porri consist of in vitro and In vivo antagonist test. Antagonist test was carried out by dual culture method and the Streptomyces spp. which can inhibit the development of A porri would be used antagonist test   in vivo. The study was designed using a Factorial Complete Randomized Design with two factors, candidate isolates of biological control agents and concentrations of Streptomyces spp. be diluted into 5%, 10%, and 15%, it will applied on shallot plant Bauji variety. The results of the In vitro test shown the highest inhibition zone from BMP 17.75% while BMS1 13.75%, BMS2 8,75%, and 8.50%. in vivo test shown lowest disease severity value in BMP 15% concentration was 1.13% while diseases severity of BMS1 was 1.27%, and BMS2 was 1.80%. Therefore, Streptomyces spp. has potency as an alternative pesticide for sustainable agriculture.
Biodegradation Potential of Streptomyces sp. Against propineb-Based 70% Fungicide Under In Vitro Conditions Sari, Nadya Naurah; Mujoko, Tri; Wiyatiningsih, Sri
CROPSAVER - Journal of Plant Protection Vol 8, No 2 (2025)
Publisher : Departemen Hama dan Penyakit Tumbuhan Fakultas Pertanian Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cropsaver.v8i2.66871

Abstract

The intensive use of propineb-based fungicides in agriculture can negatively affect the environment due to toxic and persistent residues in soil. An environmentally friendly approach to reduce these impacts is bioremediation using microorganisms such as Streptomyces sp. This study aimed to examine the tolerance and biodegradation potential of Streptomyces sp. toward 70% propineb fungicide under in vitro conditions. The research was conducted at the Plant Health 1 Laboratory, Universitas Pembangunan Nasional “Veteran” East Java, from June to August 2025. The experiments were carried out in two stages: (1) a tolerance assay on Glucose Nutrient Agar containing propineb at 0; 0,50; 1,00; 1,50; and 2,00 g/L, and (2) a degradation assay using a dual-culture method with Colletotrichum sp. as a bioindicator. Observation variables included Total Plate Count (TPC) of Streptomyces sp., colony diameter of Colletotrichum sp., and the relative inhibition level (THR). Results showed that Streptomyces sp. was able to grow at all fungicide concentrations. The highest population was found in P0 (0 g/L) with 1,42×1013 CFU/mL with growth decreasing as propineb concentration increased, reaching the lowest level of 3,22×10¹⁰ CFU/mL in P4 (2.00 g/L). In the degradation assay, Colletotrichum sp. colony diameter decreased from 3,38 cm in P0 (0 g/L)  to 2,24 cm in P4 (2,00 g/L). Meanwhile, THR values increased consistently with fungicide concentration, rising from 3,17% in P0 (0 g/L)  to 35,48% in P4 (2,00 g/L).