Hazelnut trees are exposed to oily blight syndrome, presenting a major challenge due to its impacts on leaves, fruits, and branches. This syndrome results from a combination of pathogenic fungal and environmental factors, namely increased humidity, rainfall, poor ventilation, tree stress, and nutrient deficiencies. Symptoms appear as dark spots with an oily or watery appearance that turn brown and lead to drying and premature drop. Studies recommend an integrated program including proper pruning, removing infected parts, regulating irrigation, and applying preventive fungicides. Research issued by plant disease research centers, the Food and Agriculture Organization (FAO), and the General Commission for Scientific Agricultural Research proves that integrated management combining control, soil improvement, and balanced fertilization limits the spread of fungal diseases and increases tree resistance to environmental stress.
Reports of the Food and Agriculture Organization (FAO) on fruit tree diseases. Plant protection and woody and nut tree disease studies. Research issued by the General Commission for Scientific Agricultural Research. General information from the Syrian Agricultural Guide and Livestock in Syria _ Specialized Evidence Center.
