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All Journal Bernas International Journal of Social Science, Educational, Economics, Agriculture Research, and Technology (IJSET) International Journal of Educational Research Excellence (IJERE) Jagur: Jurnal Agroteknologi
Noverina Chaniago
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Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Computer Science & IT Economics, Econometrics & Finance Education Environmental Science Languange, Linguistic, Communication & Media Social Sciences Other

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STUDY OF REFUGIA AND VARIETIES TO REDUCE THE INTENSITY OF SPODOPTERA FRUGIPERDA AND INCREASE PREDATORS OF SWEET CORN PESTS Namsen Sartonedi S Girsang; Asmanizar; 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.v4i12.1159

Abstract

The research was conducted at the Experimental Field of the Faculty of Agriculture, University of Islam Sumatera Utara, Jln. Karya Wisata, Gedung Johor, Medan Johor District, Medan City, North Sumatra Province, at an altitude of approximately 25 metres above sea level, with flat topography. This research was conducted from January to March 2025. S. frugiferda is an important pest on corn plants that can cause losses with an attack intensity of up to 80%. The purpose of this research was to determine the effect of refugia plants and corn varieties on S. frugiferda attacks and the number of pest predators. This study used a split-plot design with two treatment factors, namely refugia plants Turnera subulata (B1), Tagetes erecta (B2), No Refugia (B0), and treatments of Pertiwi variety (V1) and Advanta Madu 59 variety (V2). The results showed that the Turnera subulata refugia plant and the Advanta Madu 59 variety produced lower S. frugiferda pest attacks and higher numbers of pest predators, although this was not statistically significant.
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 Abdul Hakim Hutasuhut Algi Utama Ardiansyah , Arif Prandana Asmanizar Deddy Wahyudin Purba dedi kurniawan Edward Tri Nanda Elfin Efendi Fenty Maimunah Simbolon Firmansyah Hasibuan Irawati Chaniago Irfan Suliansyah Muhammad Rizwan Nalwida Rozen Namsen Sartonedi S Girsang Riki Zupriadi Rohayati Sitanggang Safruddin . Safruddin Safruddin Sri Susanti Ningsih Surya Agus Efendy Syafrizal Hasibuan Syamsafitri Yulita Inriyani