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How to increase the survival rate when propagating geraniums
Geraniums are mainly propagated by cuttings. To increase the survival rate, you must master the following points: (1) Selection of cuttings. Choose branches that are solid inside and have a small cut surface as cuttings. The specific method is to pinch off the growing tip of the mother plant in advance, and after new side branches emerge, cut the branch from the base of the new side branch, close to the mother branch. (2) Cutting time. Cuttings are generally taken in mid-September. If the cuttings are not newly grown side branches, the cut cuttings must be left to dry for at least a whole day.
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What are the control methods for geranium brown spot disease?
Control of geranium brown spot disease: 1. Collecting and burning diseased and dead plant tissue is the key to controlling this disease. For potted plants or field beds, waterlogging and damp, shady conditions should be avoided. 2. Before and after the onset of the disease, spray a 50% carbendazim 800 to 1000 times dilution or a potassium permanganate 1500 times dilution, once every 10 days, for 2 to 3 consecutive sprays.
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What are the control methods for crown gall disease in geraniums?
Control of crown gall disease in geraniums: 1. Before planting, find and pull out diseased plants. When necessary, disinfect the stem base of the seedlings by first soaking in 1% copper sulfate for 5 minutes, then transferring to 2% lime water for 1 minute. 2. Choose soil free of crown gall disease as nursery soil and potting soil. For potted plants that develop the disease, replace with disease-free soil. 3. For plants in the early stages of the disease, use a knife to cut away the gall, then apply lime sulfur mixture residue or Bordeaux paste to the wound, or apply methyl-acetic-iodine solution (50 parts methanol, 25 parts glacial acetic acid, 12 parts iodine flakes) to the gall, which can heal the affected area.
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Causes and Control Methods of Pelargonium Leaf Curl Disease
Pelargonium leaf curl disease, also known as Pelargonium crinkle disease, is a viral disease that has only been found in the Shanghai area. Symptoms: The leaves of infected plants curl downward and become stunted. In severe cases, the plants die. Pathogen: The pathogen is Pelargonium leaf curl virus (PLCV). Disease pattern: The virus is transmitted by sap, grafting and soil; no vector insect has been found. In summer and autumn, the symptoms of the disease are not obvious, and the residual virus-carrying plant debris from pruning can spread the virus.
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Symptoms and Control Methods of Geranium Ringspot Disease
[Pathogen]Tobacco ringspot virus (Tobaccoringspotvirus, TomRSV), thermal inactivation point 58°C; Pelargonium ringspot virus (prlargoniumringspotvirus, PRSV), thermal inactivation point 85°C. [Symptoms]Chlorotic yellow spots, ringspots and line patterns appear on leaves, plants grow stunted, and flowers develop abnormally. [Disease pattern and epidemic characteristics]Propagating from cuttings taken from diseased plants is the main route of virus transmission. Sap
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Control Methods for Geranium Mosaic Disease (CMV)
Symptoms: Leaf symptoms appear as a mosaic pattern; the leaves are smaller than normal and show an uneven, bumpy surface. On some varieties, chlorotic spots develop and the flowers become color-broken. The pathogen is Cucumber mosaic virus (CMV). Transmission routes are sap transmission and aphid transmission. Control methods: 1. During management operations, frequently wash and disinfect with soapy water. 2. Control aphids promptly and eradicate surrounding weeds.
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How to prevent and treat Geranium blackleg disease? Introduction to practical methods
Symptoms This disease occurs on both cuttings and mature plants, with cuttings being more severely affected. Decay begins at the base of the stem and develops upward, causing death. After mature plants are affected, they turn black, and the blackening spreads upward, the leaves drop, and the entire plant withers and dies. Pathogen Pythium splendens Braun, belonging to the Mastigomycotina. The hyphae are well developed, branched, and non-septate, appearing as white cottony fluff when growing vigorously. Sporangia are filamentous, round, or nearly round, and produce zoospores that cause infection.
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Symptoms and Control Methods of Common Leaf Spot Diseases in Geraniums
Geranium leaf spot disease is a common disease in spring and summer. It is most likely to occur in hot and rainy seasons, often causing most of the infected leaves to die and drop off. When the stem is infected, it turns black, wilts and rots; cutting open the base reveals brown or black vascular bundles. Affected cuttings fail to root, with rot starting from the stem and developing upward, causing leaves to wilt and die. Symptoms: Geranium leaf spot disease includes two types: black spot disease and brown spot disease. Black spot disease: initial water-soaked spots appear on leaves, semicircular to irregular in shape, later becoming circular, 2 to 3 mm in diameter,
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A Detailed Guide to Common Geranium Diseases and Their Control Methods
The main diseases of geraniums include: ① Leaf spot disease. In the early stage, needle-tip-sized, round or irregular small brown spots appear on the leaves, which gradually expand into dark brown or reddish-brown lesions. In severe cases, the entire leaf is covered with lesions until it dries up and falls off; the stems and branches also turn black, shrink and rot, and even the leaves on the stems wither and die, leaving only a few leaves at the top. Preventive measures: a. When cultivating in a greenhouse, do not plant too densely, and pay attention to frequent ventilation and light exposure; b. When watering, avoid pouring water onto the plants and avoid splashing water droplets
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Detailed Explanation of Flower Break Virus Disease in Pelargonium
[Pathogen] Pelargonium flower break virus (PFBV), thermal death point 85-90°C. [Symptoms] On the flowers of certain cultivars, stripes of varying shades appear, and the flowers become deformed and smaller; the leaves of seedlings show faded spots, and sometimes necrotic spots appear on the leaves.
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