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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) MEDALION JOURNAL: Medical Research, Nursing, Health and Midwife Participation
Syamsafitri
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Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Dentistry Economics, Econometrics & Finance Education Health Professions Medicine & Pharmacology Nursing Public Health Veterinary

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INFLUENCE OF RAINFALL ON DOWNY MILDEW INTENSITY, PRODUCTIVITY, AND SYMPTOMS OF Peronosclerospora spp. ATTACK IN MAIZE CROPS IN SIMALUNGUN REGENCY Murni Radiah; Syamsafitri; Murni Sari Rahayu; Romi Fahri
International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET) Vol. 4 No. 8 (2025): JULY
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54443/ijset.v4i8.869

Abstract

Maize is one of the world's food crops, and Simalungun Regency is one of the corn production centers in Indonesia. Corn production in Simalungun Regency has decreased due to various factors including downy mildew. Downy mildew disease is caused by Peronosclerospora spp. its development is increasingly rapid supported by a high humidity environment, while the purpose of the study was to examine the effect of rainfall on downy mildew disease intensity, productivity, production, and symptoms of corn plant attack in different locations.Research method: Observations of correlation and regression tests of rainfall on disease intensity, productivity, production, and harvest area of corn were analyzed using Minitab statistical application.The results showed that there is a relationship between rainfall and downy mildew intensity, production, productivity, and harvest area of corn plants. The intensity of downy mildew was highest in Tanah Jawa sub-district with an average disease intensity of 7.81%, this was due to the fact that no eradication was done on plants infected with Peronosclerospora spp. The symptoms of attack found at each observation location had the same symptoms.
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.
Co-Authors Amalia Asmanizar DARMA BAKTI NASUTION Fenty Maimunah Simbolon Indra Gunawan Khairil Hanif Lisnawita Mahyuddin Dalimunthe May Ryan Sandi Muhammad Rizwan Murni Radiah Murni Sari Rahayu Noverina Chaniago Nurhayati RADITE TISTAMA Rahmi Dwi Handayani Rambe Rohayati Sitanggang Romi Fahri S. Edy Sumantri Sri Hafnida Ritonga Sulaiman Ginting Tri yuslisa sirait