World Journal of
Pharmaceutical and Life Sciences

IDENTIFICATION OF PERONOSCLEROSPORA SPP. MORPHOLOGICAL CAUSES OF DOWNY MILDEW DISEASE IN CORN PLANTS (ZEA MAYS L.) IN DELI SERDANG, NORTH SUMATRA, INDONESIA

Novianti Br Tarigan, Syamsafitri* and Yenni Asbur

ABSTRACT

Downy mildew on corn plants in Deli Serdang was originally identified as being caused by one species. In recent years, reports have stated that downy mildew on corn plants is caused by several species of Peronosclerospora. This study aims to identify Peronosclerospora spp. causes of downy mildew in corn plants and determines the diversity of Peronosclerospora spp. Morphological causes of downy mildew disease in corn plants in four sub-districts in Deli Serdang Regency. The research was carried out from February to April 2024 on farmers' corn plantations and in the laboratory of the North Sumatra Animal, Fish and Plant Quarantine Center, Kualanamu Service Unit. Field observations were carried out by counting downy mildew attacks in four sub-districts in Deli Serdang district. Observations in each sub-district were carried out in two villages which are corn planting centers so there were eight different locations. The results of the research show that the identification of the causes of downy mildew disease on corn plants in four sub-districts of Deli Serdang Regency has been described based on cell wall thickness, shape and size of conidia, and has been outlined in an identification key. The results showed that the cause of downy mildew was P. maydis. This shows that downy mildew caused by P. sorghi and P. philippinensis has not spread in Namorambe, Pancur Batu, Kutalimbaru and Sunggal subdistricts. The highest intensity of downy mildew attacks was found in the villages of Tanjung Anom and Tuntungan in Pancur Batu District, namely 14.91% and 10.54% respectively, while the lowest intensity of downy mildew attacks was found in the villages of Central Kuta and Namorambe in Namorambe District, namely respectively 2.5% and 3.5%.

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