Differentiation and Control of Leaf Spot and Chlorosis Diseases
Let me tell you about some knowledge of the flower clinic, including the differentiation and control of leaf spot and chlorosis diseases. The following is an introduction for you.
Leaf spot and chlorosis diseases are two common types of diseases in ornamental plants. Although they have some similar symptoms, there are significant differences in their causes, occurrence patterns, and control methods. Here is a general introduction to the nature and characteristics of these two types of diseases for reference.
I. Leaf Spot Disease: The green leaves have alternating patches (or streaks) of deep green, light green, light yellow, and yellowish white. For example, diseases such as camellia leaf spot, rose leaf spot, salvia leaf spot, banana leaf spot, gladiolus leaf spot, and tulip leaf spot are caused by various leaf spot viruses. The disease is transmitted through aphids, abrasion, and grafting. Control methods: 1. Timely control of vectors such as aphids; 2. Diseased plants should not be used as propagation materials and should be destroyed in a timely manner; 3. Chemical control: TS wettable powder, plant disease terminator emulsion, virus A, virus net, virus spirit, 83 resistance enhancer, antiviral agent No. 1, antiviral wettable powder, fungicidal clear, weak-toxic vaccine N14, satellite RNA S52, plant virus passivation agent-912, etc., can be used.
It should be noted that the "leaf spot" phenomenon in many flowering plants is not actually a viral disease but a special breed, such as variegated kaffir lily, variegated ginger, golden hearted吊兰, golden hearted boxwood, silver edge boxwood, spotted spider plant, variegated Chinese evergreen, leaf art orchid, variegated pothos, etc.
II. Chlorosis Disease: This refers to the leaves turning evenly into yellowish white. According to different pathogens, it can be divided into two types: physiological chlorosis and pathological chlorosis.
(1) Physiological Chlorosis: The cause of this disease is more diverse. Among them, iron deficiency chlorosis is more common, which often occurs in the cultivation of acid-loving flowers such as azalea, gardenia, hydrangea, and jasmine in northern regions, with new leaves turning yellow and severe cases resulting in brown and withered leaves. In addition, sulfur deficiency, nitrogen deficiency, excessive sunlight, excessive watering, low temperature, and drought can also cause leaf chlorosis. This type of disease is mainly solved by strengthening cultivation management and reasonable fertilization, and generally does not require medication.
(2) Pathological Chlorosis: This is a type of infectious disease caused by mycoplasma-like organisms (microorganisms between bacteria and viruses), such as chrysanthemum chlorosis, cosmos chlorosis, daisy chlorosis, and delphinium chlorosis. The difference between pathological chlorosis and physiological chlorosis is that the former is infectious while the latter is not, and the former often accompanied by bushy growth (adventitious buds multiplying and becoming "broom-like") when yellowing symptoms occur. Control methods: 1. Timely control of vectors such as leafhoppers; 2. Improve propagation methods to avoid transmission through grafting; 3. Use virus-free mother plants for propagation; 4. Chemical control: Treat with antibiotics such as tetracycline.
The above is a detailed explanation of the differentiation and control of leaf spot and chlorosis diseases, for your reference only!