Narcissus brown spot, also known as spot disease, is a fungus belonging to the genus Subgenus spp. of the semi-known fungus, and it overwinters with mycelia or conidia on the upper epidermis of the narcissus bulb or on dead leaves. The occurrence of the disease in daffodil production is relatively common and has a great impact on the yield and quality of daffodils.
1. Symptoms of damage
1.1 At the beginning of the disease, irregular yellow, red, and brown spots appeared on the upper part of the narcissus leaves or on the pedicels, and later developed into oval, spindle-shaped or irregular shaped spots.
1.2 There are halos around the lesion and black dots (conidia) in the center.
1.3 When the disease is serious, the lesions fuse with each other and grow into large blocky patches. The leaves are yellow and dry and affect the development and flowering of narcissus. It even caused the death of the narcissus plants that had not yet grown.
2. Control technology
2.1 After the narcissus was harvested, the garden was completely cleared and the diseased plant residues were collected and burned.
2.2 Use disease-free bulbs for cultivation.
2.3 Sterilization of the ball: The narcissus bulb can be soaked with 40% formaldehyde 100 times for 2 hours or soaked with 50% Carbendazim WP 500 times for 12 hours.
2.4 During the growth period of Narcissus, from mid-March to the end of May, spray a 1:1:100 equal amount of Bordeaux fluid protection agent; or 65% of Zeisonic zinc wettable powder 500 times; or 70% thiophanate-methyl wettable powder. 1000 times liquid spray control, spray once every 10 to 15 days, 3 to 5 times spray prevention.
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