Two methods for controlling corn brown spot
(I) Occurrence: The brown spot disease of corn is a fungal infection caused by the pathogen Physoderma maydis, which belongs to the class of oomycetes, not bacteria. The fungus survives in the soil or on infected plant debris in the form of resting spores. These spores are carried to maize plants by wind and rain during the following growing season. Under favorable conditions, such as high humidity and warm temperatures, the zoospores germinate and move through water films on the leaf surfaces, leading to infection. The disease typically affects the silks and young tissues of the corn plant. High rainfall during the mid to late growth stages, combined with high temperature and humidity, creates an ideal environment for the disease to thrive. Additionally, fields located in low-lying areas or those with continuous cropping tend to experience more severe outbreaks. (II) Prevention and Control Methods: Agricultural practices play a crucial role in managing this disease. Farmers should choose resistant corn varieties and avoid planting the same crop in the same area for more than three consecutive years to reduce the buildup of pathogens. Proper fertilization and irrigation should be applied to promote strong plant growth and improve the plant’s natural resistance. After harvest, all infected plant residues must be removed and buried deeply to minimize the survival of the pathogen over winter. Chemical Control: If the disease appears, it is important to apply fungicides promptly. A 20% triadimefon emulsifiable concentrate diluted at 3000 times, or 50% carbendazim wettable powder diluted between 500 to 800 times, can be used. Alternatively, 25% mancozeb wettable powder at 1500 times dilution is also effective. Spraying should be done every 7 to 10 days, with 2 to 3 applications recommended. To enhance effectiveness, foliar fertilizers such as foliar treasure, potassium dihydrogen phosphate, and urea can be added to the spray solution. When applying the spray, focus on the lower and middle parts of the leaves, as well as the leaf sheaths, where the infection often starts. Compound Water Retention Agent Thickener Natural Water Retention thickener,Food Grade Thickening Agent,Food Grade Water Retention Agent Henan chinamian foods CO.LTD , https://www.ooossooo.com