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All Journal International Journal of Economic, Business, Accounting, Agriculture Management and Sharia Administration (IJEBAS) International Journal of Social Science, Educational, Economics, Agriculture Research, and Technology (IJSET)
Syamsafitri
Universitas Islam Sumatera Utara
Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Economics, Econometrics & Finance Education

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IDENTIFICATION AND MORPHOLOGICAL CHARACTERIZATION OF PERONOSCLEROSPORA MAYDIS CAUSING DOWNY MILDEW ON MAIZE IN LANGKAT AND SIMALUNGUN REGENCIES Rohayati Sitanggang; Syamsafitri; Noverina Chaniago
International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET) Vol. 4 No. 12 (2025): NOVEMBER
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54443/ijset.v4i12.1531

Abstract

Downy mildew, caused by oomycetes of the genus Peronosclerospora, is the most destructive biotic threat to maize cultivation in Indonesia, with the potential to cause up to 100% yield loss. Accurate species identification is crucial for determining effective control strategies. This study aimed to identify and characterize the Peronosclerospora spp. responsible for downy mildew in eight survey locations across Langkat and Simalungun Regencies, North Sumatra. The research involved field surveys and laboratory microscopic observations to analyze qualitative (morphological) and quantitative (morphometric) parameters. Identification results indicated that all pathogen isolates from the eight locations were Peronosclerospora maydis. Morphologically, the pathogen featured hyaline conidiophores that were clustered, with 2–4 dichotomous branches. Morphometrically, structural variations were observed, with conidiophore lengths ranging from 150–550 µm and conidial diameters between 17–23 x 27–39 µm. Conidia were predominantly spherical to subspherical with thin cell walls. These dimensional variations are suggested to be influenced by external factors such as local agroclimatic conditions and host genotypes. This study confirms that P. maydis remains the primary pathogen causing downy mildew in North Sumatra.
IMPLEMENTATION OF ENVIRONMENTALLY FRIENDLY AGRICULTURE IN RICE CULTIVATION FOR CLIMATE CHANGE ADAPTATION IN DELI SERDANG REGENCY Dwiki Riyantho Pasaribu; Nurhayati; Syamsafitri
International Journal of Economic, Business, Accounting, Agriculture Management and Sharia Administration (IJEBAS) Vol. 6 No. 5 (2026): October (ON-PROGRESS)
Publisher : CV. Radja Publika

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Abstract

This study aims to analyze the application of environmentally friendly agriculture as an adaptation strategy for rice farmers to climate change in Beringin District, Deli Serdang Regency. The study used a descriptive quantitative approach with a survey method of 21 rice farmers. Data were collected through questionnaires, observations, interviews, and documentation, then analyzed descriptively using a Likert scale and SWOT analysis. The results showed that farmers' knowledge had an average score of 5.00 (100%), perception of climate change 4.86 (97.1%), application of environmentally friendly agriculture 4.55 (91.0%), pests and diseases 4.34 (86.8%), implementation constraints 4.43 (88.6%), and the use of environmentally friendly technology 4.42 (88.4%). Dominant practices include organic fertilizer, straw management into compost, stress-resistant varieties, and Integrated Pest Management. The main constraints are limited capital, production facilities, and technical assistance. The SWOT analysis positions farmers in a position to support growth strategies, with strengthening farmer groups, extension, financing, and adaptive technology as development priorities.
OPTIMIZING THE USE OF SINABUNG VOLCANIC ASH AND ORGANIC MATTER AS SOIL AMENDMENTS TO SUPPRESS LATE BLIGHT (PHYTOPHTHORA INFESTANS) AND INCREASE POTATO (SOLANUM TUBEROSUM) PRODUCTION IN THE KARO HIGHLANDS Elpiani Br Sinulingga; Muhammad Rizwan; Diapari Siregar; Syamsafitri
International Journal of Economic, Business, Accounting, Agriculture Management and Sharia Administration (IJEBAS) Vol. 6 No. 5 (2026): October (ON-PROGRESS)
Publisher : CV. Radja Publika

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Abstract

This research was conducted in Surbakti Village, Simpang Empat District, Karo Regency, North Sumatra Province, Indonesia, at an altitude of approximately 1,250 meters above sea level (masl). The research was carried out from August to November 2025. This research was supervised by Dr. Ir. Muhammad Rizwan, M.P. as the Head Supervisor and Dr. Ir. Diapari Siregar, M.P. as the Assistant supervisor. Potato is a strategic horticultural commodity in North Sumatra, whose productivity has declined due to decreasing soil fertility and increasing pest and disease incidence. This study aimed to determine the effect of volcanic ash and organic matter formulations on soil nutrient status in potato cultivation fields in Surbakti Village.The experiment employed a Randomized Complete Block Design (RCBD). The first factor was the formulation of volcanic ash and organic matter, consisting of: A0 = control; A1 = 5 tons/ha (60% volcanic ash + 40% rice husk); A2 = 5 tons/ha (60% volcanic ash + 40% cattle manure); and A3 = 5 ton/ha (40% volcanic ash + 30% rice husk + 30% cattle manure). The second factor was the application time of the volcanic ash and organic matter, consisting of: B1 = one week before planting; B2 = at planting; and B3 = one week after planting.The results showed that the volcanic ash formulations significantly affected plant height, number of leaves per plant, stem diameter, number of tubers per plant, tuber yield, tuber diameter, and the severity of late blight disease. The application timing significantly affected plant height, number of leaves per plant, number of tubers per plant, tuber yield, and tuber diameter. Furthermore, the interaction between volcanic ash formulation and application timing significantly affected plant height and the number of leaves per plant
Co-Authors Diapari Siregar Dwiki Riyantho Pasaribu Elpiani Br Sinulingga Muhammad Rizwan Noverina Chaniago Nurhayati Rohayati Sitanggang