1, blight. The site of development is the tip of the young leaf, and the symptoms develop from the top to the bottom. When severe, the entire leaf becomes yellow and withered. The disease is mainly a physiological disease caused by excessive fertilization or excessive watering. Control methods: When the amount of fertilizer is too large, change the pot more soil, the root of the underlying pad layer of fine sand, basin soil suitable for loose rot leaf soil, the pH is appropriate for neutral. To control the amount of water, do not water too much. When watering too much, control the water immediately and remove the yellow leaves. The plants can still resume normal growth. 2, leaf spot. There are two types of leaf spot symptoms. One is the appearance of small yellow spots on the leaves. The lesions are enlarged. The diameter is up to 3-5 mm. The circle is round. The lesion spreads and the leaves are yellow; the other is the disease on the leaves. Large in size, irregular in shape, yellow-brown to gray-brown, slightly ringed, with black dots on the back of the late lesions. These are due to poor ventilation, scale insect parasitism, resulting in debilitating plant growth. Control methods: Apply lesion with 0.5% potassium permanganate solution, or spray with 50% carbendazim 1000 times solution. If the disease is serious, remove the victim's leaf and dry the wound with sterile cotton wool. 3. Bacterial rot disease: The occurrence of the disease is caused by the invasion of pathogenic bacteria due to mechanical damage or harm by scale insects, mainly leaf sheath sheath heart. The lesions were spotted with water stains, which turned brown afterwards. Control methods: Remove rot parts, blot dry with absorbent cotton, and smear with 0.02% streptomycin.
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Clivia disease prevention and treatment
Improper cultivation and management of Clivia often leads to invasion of pathogens and causes disease. The light affects the ornamental value, while the death of the plant results in undue loss.