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What are the control methods for Dianthus leaf spot?
Identification points: Dianthus leaf spot mainly affects the leaves. Leaf spots are initially yellow, gradually becoming dark brown round to oval spots, and later the spots turn grayish brown with dark brown edges; in severe cases the spots join together, causing the leaves to turn yellow, wither and drop early. Under humid conditions, many small black granules appear beneath the spots, namely the conidia and conidiophores of the pathogen. Occurrence characteristics: a fungal disease. It can occur year-round in greenhouses. Under conditions such as abundant rain, heavy fog and heavy dew, the disease occurs easily. Poor ventilation and light transmission, extensive management and weak plant growth can all
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What are the control methods for Fusarium wilt of carnation?
1. Symptoms: The infected parts turn yellowish-brown or brown with dry rot, spreading rapidly upward; the stem shrinks, and a cross-section of the xylem shows yellowish-brown or purplish-brown decay. The leaves on the aboveground part of the diseased plant lose their luster and become soft, and the leaves near the root crown first turn yellow and droop. The disease develops rapidly, and the plant quickly wilts; if the pathogen invades from one side of the plant, only half the plant wilts first. When the environment is humid, colored filamentous structures can be seen at the rotted root crown area; these are the fruiting bodies of the pathogen. 2. Pathogen: Fusarium dianth
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Symptom Identification and Control Methods of Carnation Rust
Rust is one of the common diseases of carnation, and susceptibility varies among cultivars. It generally occurs commonly in autumn and winter when control is neglected, and is severe in continuous cropping fields where the previous crop was heavily diseased. The whole plant can be affected, with leaves suffering the most severe damage. Reddish-brown spots appear on both the upper and lower surfaces of diseased leaves, and the epidermis around the diseased area ruptures, exposing red powdery material, which is the uredinium of the pathogen. In the later stage, the color of the diseased area deepens, and after the epidermis ruptures, dark brown to black powdery material appears, which is the telium of the pathogen. Rust can also damage the stems and sepals of carnation. Carnation rust is caused by the fungus Uromyces dianthi, and is a
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Dianthus Cultivation Methods and Care Tips Explained in Detail
1. Highlights: Dianthus is one of China's famous ornamental flowers, with a long history of cultivation, and ancient poets praised it greatly. The two great poets of the Tang Dynasty, Li Bai and Du Fu, both left famous lines praising the dianthus flower for later generations. The Poet Immortal said, "Dianthus embroidered on silk robes." The Poet Sage said, "Musk sleeps among dianthus." This shows that as early as more than 1,200 years ago in the Tang Dynasty, dianthus was already widely cultivated for people to admire. Dianthus is widely distributed in China's Northeast, North China, Northwest, and the provinces of the Yangtze River basin, and is now widely cultivated at home and abroad. Dianthus resembles bamboo in form, with dense flowers and bright colors.
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Pinching and Pruning Methods for Cut-Flower Carnations
1. Pinching Techniques for Cut-Flower Carnations The purpose of pinching cut-flower carnations is to increase the number of branches, raise the flower yield per plant, regulate the flowering period, and ensure a balanced, timely supply of flowers. (1) Pinching time The first pinching of carnations is generally carried out about 30 days after planting, when the main stem of the seedling has 6 to 7 pairs of leaves unfolded. When the main stem has 5 to 6 nodes, the apical growing point is removed; depending on the branching characteristics of different cultivars, 1 to 2 nodes more or fewer may be retained as appropriate, and cultivars that branch poorly may be left with higher nodes.
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Pests and Control Methods for Cut-Flower Carnations
(1) Red spider mite: damage is severe under high temperatures above 25°C (July to August), with a small number of occurrences around mid-April. Control methods: remove dead branches, fallen leaves and weeds, improve cultivation conditions, and appropriately increase air humidity. At the initial stage of occurrence: spray 40% dicofol emulsifiable concentrate at 1000-1500 times dilution, or 40% dimethoate emulsifiable concentrate at 1500 times dilution, or 25% phosmet emulsifiable concentrate at 1000 times dilution, or fenvalerate at 800-1000 times dilution, or saomantjing, propargite, hexythiazox, pyridazinone, flufenoxuron, miechongling, etc.
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Control Methods for Rhizoctonia Stem Rot of Carnation
It mainly attacks the root crown area of the plant, and infected plants dry up and die quickly. The pathogen infects the root crown of seedlings near the soil surface, initially causing brown or dark brown spots that gradually spread to the surrounding area. The base of the seedling rots and constricts, causing lodging. When older seedlings at the stem base are affected, the cortex near the soil surface rots and becomes slimy. The leaves of diseased plants turn pale white, wilt and droop, and finally the whole plant dies. Control methods: (1) Before cuttings are taken, flower pots and soil must be disinfected. (2) Plants should be grown on raised beds, and watering should be controlled so that the potting soil does not become too wet. (3) Disinfection
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Occurrence and Control Methods of Carnation Viral Diseases in Protected Cultivation
Symptom Identification Carnation Vein Mottle Virus Disease When carnation is infected by Carnation vein mottle virus, it infects carnation, China pink (Dianthus chinensis) and American pink (Dianthus barbatus), all producing systemic mosaic, and in winter the old leaves often show symptom masking. Discolored spots appear on the petals, and the symptoms are especially obvious on red large-flowered cultivars. Carnation Latent Virus Disease After carnation is infected by this virus, it generally shows no symptoms, or has mild mosaic symptoms. But when Carnation latent virus and Carnation vein mottle virus infect together, mosaic symptoms are produced. Carnation
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Key Points and Methods of Jasmine Pruning Techniques Explained
Dormant-season pruning: Carry out before spring bud break, generally pruning around Qingming Festival, with the aim of promoting a neat and sturdy first flush of branches and adjusting the branch crown. The specific pruning methods are: 1. Cut off diseased and pest-infested branches, dead branches, thin branches and weak branches. 2. Shorten one-year-old branches: cut off the tips of last year's branches, keeping 10 cm to 15 cm at the base. 3. Remove all leaves. Growing-season pruning: Carry out from after bud break at Spring Festival to before overwintering; the specific pruning methods are: 1. For blind branches (branches that do not flower), water sprouts and declining
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Pruning Methods and Key Technical Points for Jasmine
In southern China, jasmine grown under normal cultivation conditions sprouts 6-8 batches of new branches each year. As the branches grow older, they continuously increase in number, grow taller, and gradually age. Branches that are too old and too long hinder the transport of water and nutrients, and plants that are too tall also affect field work such as flower picking. Pruning is an important production technique for rationally adjusting the layout of branches and leaves and promoting robust plant growth. The most important pruning task of the year is spring pruning. In Hengxian, Guangxi, jasmine branches
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