A Complete Guide to Common Diseases of the Spider Lily and Their Control Methods
Spider Lily Anthracnose
Anthracnose
Spider lilies are often affected by anthracnose, which damages the leaves of the spider lily and affects its growth.
Anthracnose is a fungal disease caused by fungi of the order Melanconiales in the subdivision Deuteromycotina. The pathogen can spread through rainwater, and in warm, humid regions the disease can occur year-round. A damp, shady growing environment or excessive nitrogen fertilization can easily trigger this disease.
Control Methods
When the disease is found, the affected leaves can be cut off and burned.
Before flowering in spring, spray 2-3 times to prevent the disease. You can use 40% sulfur-multi suspension concentrate at 600 times dilution, or 50% Shibaogong wettable powder at 800-1000 times dilution, or 25% Tanteling at 500 times dilution, applied alternately.
Also, be careful not to apply excessive nitrogen fertilizer, keep the potting soil slightly moist, and drain promptly after rain.
Spider Lily Leaf Blight
Leaf Blight
Spider lily leaf blight is also called spider lily scorch leaf disease. Leaf blight mainly harms the leaves, flowers and bulbs of the plant. Lesions appear on the leaves and expand, and in severe cases the leaves dry up.
Leaf blight is also a fungal disease, spread by wind, rain and watering, and occurs from January to November each year.
Control Methods
When spider lily leaf blight breaks out, promptly cut off the diseased and withered leaves.
Spray 50% Shajunwang water-soluble powder at 1000 times dilution, or 40% chlorothalonil suspension concentrate at 500 times dilution, or 30% copper oxychloride suspension concentrate at 600 times dilution, once every 7-15 days.
Spider Lily Brown Spot Disease
Brown Spot Disease
When brown spot disease breaks out on spider lilies, it mainly harms the leaves; with heavy rainfall, the damage is more severe.
Brown spot disease is also a disease caused by fungi.
Control Methods
Remove diseased leaves promptly when found. In late autumn, thoroughly clear away diseased leaves and burn them in a centralized manner to reduce the source of inoculum.
Spray 25% benomyl-cyclohexylzinc emulsifiable concentrate at 800 times dilution, or use 75% mancozeb wettable powder at 500 times dilution for spray control, once every 10 days or so, for 3-4 consecutive applications.