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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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What is leaf curl disease in geranium viral diseases
There are many types of geranium viral diseases. The following common ones are mainly distributed in Europe and the Americas, with a few reports also in Asia. Geranium leaf curl disease is also known as geranium crinkle leaf disease. [Pathogen] Pelargonium leaf curl virus (Pelargoniumleafcurlvirus, PLCV), thermal death point 85-90°C. [Symptoms] Chlorotic spots appear on young leaves, then develop into yellow round or star-shaped spots with a dark yellow center and a pale halo around them, along with necrotic perforation
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What are the control methods for leaf spot disease in geraniums?
Control of leaf spot disease in geraniums: 1. For small-scale plantings, remove diseased leaves by hand and burn them in a centralized manner. 2. Improve the growing environment. In areas with severe outbreaks, practice crop rotation, avoid planting too densely so as to allow good ventilation and light penetration, and drain standing water promptly. 3. During the disease period, spray with 100 to 150 times diluted Bordeaux mixture or 80% Captan wettable powder at 500 times dilution; you can also spray a mixture of 50% Thiophanate-methyl at 1000 times dilution and 80% Captan at 500 times dilution, or spray a 45% Chlorothalonil and carbendazim mixed suspension concentrate at 1000 times dilution, which gives better results than a single fungicide.
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What are the control methods for Geranium leaf spot disease?
Symptoms mainly affect the leaves. Initially, small water-soaked spots appear, which later become circular, 2-3 mm in diameter, slightly sunken in the center, with a small brown center and a yellow spreading margin around it. Old lesions can reach 6-10 mm in diameter and, restricted by leaf veins, become irregular in shape, dark brown, with concentric rings, and bear a sparse pale black mold layer on the surface. When there are many lesions on a leaf, they can merge with each other, often causing the leaf to turn black, shrivel and die. The disease conditions mainly occur on older, weakened tissue, so it is most often seen first on the lower old leaves. Rainy weather, excessive
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How should geraniums be cared for to make them bloom more?
1. Overwatering or being exposed to rain, with long-term water accumulation in the pot, causes root rot, yellowing leaves, or leggy growth of the plant, all of which affect blooming. 2. Overfertilizing, especially applying too much nitrogen fertilizer, easily causes leggy stems and leaves, no blooming or sparse blooming, and poor flower quality. However, insufficient fertilization or no fertilization will also affect the plant's normal growth and blooming. Therefore, in early spring or early autumn, appropriately apply more phosphorus and potassium fertilizer. 3. Temperature too high or too low. If the indoor temperature in winter is above 20 C, combined with poor ventilation, the stems and leaves tend to grow leggy, affecting blooming the following year.
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A Detailed Guide to Geranium Cultivation Methods and Key Technical Points
Geranium is also called "foreign hydrangea" and "balahong." Its flowering period is quite long, from October of the current year to June of the following year, with the peak bloom period being April to May. Flower colors include red, peach red, magenta, flesh red, white, and others. Other cultivated species include large-flowered geranium, shield-leaved geranium, scented geranium, musk geranium, horse-shoe geranium, and others. Geranium is a perennial herbaceous plant, originally growing in the Cape of Good Hope area of South Africa. Because it is drought-tolerant, light-loving, not particular about soil, highly adaptable to the environment, and relatively easy to cultivate, although it was introduced to China only
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What are the propagation methods for geraniums?
For home gardening, in-pot cuttings are generally the most practical method of propagation. The best time for cuttings is April to May or August to September, and the specific cutting time should be determined according to the local growing season with suitable temperatures (18-20°C); the growing medium should be loose, well-aerated and well-draining, ideally a mix of one part sand, one part perlite and one part leaf mold, or medium-coarse river sand, matured soil or expanded perlite, all of which must be sterilized by methods such as exposure to strong sunlight before use. Cuttings can be taken in conjunction with spring or autumn pruning, selecting healthy one-year-old soft shoots free of pests and diseases as cuttings, about 8 cm long,
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A Complete Guide to Geranium Care in Autumn
After the scorching summer, geraniums in a semi-dormant state begin to gradually revive, growing new leaves and blooming again, adding color to the golden autumn. However, geraniums that have just made it through the hot summer inevitably suffer from old roots and declining leaves, with weak growth. The newly emerging leaves are small and dark green, the petioles and flower stalk stems are rather short, the flower heads are small, and the overall plant shape is clumped, reducing its ornamental value. Treating geraniums with gibberellin can effectively promote lush leaves and abundant flowers, improving their ornamental value. The method is as follows: after the geranium plant resumes growth following the summer, when the flower stalk stems of the first batch of flowers change from curved to upright
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Are trailing geranium and ivy geranium the same plant?
Family: Geraniaceae Latin name: PewlargoniumPeltatum Alias: Ivy geranium Origin and habits: Native to the Cape of Good Hope, Africa. Cultivated throughout China. Growth habits: Likes sunlight, but is also fairly shade-tolerant. Afraid of cold, needs to be cultivated in a greenhouse. Not tolerant of waterlogging. Likes loose, well-drained soil. Morphological characteristics: Trailing, stems and branches brown, young stems green or with a red flush. Leaves ovate or obovate, smooth, thickly leathery, with sparse
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Ivy Geranium: The Ideal Flower Material for Creating Hanging Flower Beds
Ivy geranium, also known as ivy-leaved geranium, is the main material for European balcony flower troughs, hanging flower baskets, and flower pots. It was introduced in China starting last year, mainly used for hanging flower baskets, tall flower pots, etc., and in areas with suitable temperatures, the flowering period lasts up to half a year. Currently, commonly used varieties include 'Tornado' and 'Summershowers', among which 'Tornado' has advantages such as strong branching ability, short internodes, good plant shape, heat tolerance, and rain resistance. 'Summershowers' has obvious trailing characteristics. Colors include rose red, purple red, carmine, purple, white
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