Pest and disease infestations are among the major biotic constraints reducing maize productivity in Indonesia. High infestation levels of fall armyworm (Spodoptera frugiperda), migratory locust (Locusta migratoria), downy mildew (Peronosclerospora spp.), northern leaf blight (Helminthosporium turcicum), and common rust (Puccinia sorghi) highlight the need for developing maize varieties with improved resistance. This study aimed to identify one or more Padjadjaran field maize hybrids with superior resistance to major pests and diseases during critical growth stages under medium-altitude conditions in Sumedang. The research was conducted at the experimental field of Universitas Padjadjaran, Sumedang, West Java, Indonesia, from March to July 2025. An observational screening approach was employed as an initial resistance-selection stage involving 70 Padjadjaran field maize hybrids and five commercial check varieties. Plant resistance responses were assessed visually based on disease incidence and pest/disease severity using the rating scale proposed by Mayee and Datar (1986). The results revealed that several Padjadjaran field maize hybrids exhibited greater resistance than the commercial check varieties, with disease and pest severity values reaching 0%. Genotype 30035 showed resistance to downy mildew and fall armyworm infestation. Genotype 30034 was resistant to downy mildew, common rust, and fall armyworm, while genotype 30062 exhibited resistance to downy mildew and northern leaf blight. In addition, genotype 30009 demonstrated resistance to downy mildew, northern leaf blight, fall armyworm, and migratory locust. These genotypes have potential as promising genetic resources for the development of maize cultivars resistant to multiple pests and diseases.

Keywords: maize hybrids, insect pest and disease resistance, plant breeding

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