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The Harm and Control Methods of Angelica Leaf Spot Disease
The pathogen of Angelica leaf spot disease (Septoria SP.) is a fungus of the genus Septoria in the subphylum Deuteromycotina. The pycnidia are round, and the conidia are filiform to needle-shaped, colorless and transparent, straight or slightly curved, mostly with slightly pointed tips, with 1-3 septa. 1. Harmful symptoms: it damages the leaves. In the early stage of the disease, brown spots appear on the leaf surface, and the lesions gradually expand, with a chlorotic halo appearing around them, the edges appearing reddish-brown, and the center grayish-white. In the later stage, small black particles appear within the lesions. When the disease is severe, most of the leaf becomes reddish-brown, and finally gradually withers
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What are the control methods for rice bacterial leaf streak?
Rice bacterial leaf streak, or rice fine stripe disease for short, is an important disease in rice production in China. Its pathogen belongs to the genus Xanthomonas, and the bacteria mostly enter through the leaf stomata; symptoms can appear at any growth stage of rice. The lesions are short, fine, narrow stripes, with the striping appearing between the leaf veins. When held against the light, the lesions appear semi-transparent and water-soaked, turning red later; the bacterial masses on the stripes are very numerous, especially on the underside of the leaf, and are not easily dislodged when dry. Because hybrid rice still lacks disease-resistant combinations, and because the disease occurs over a wide area with an uneven distribution, this creates great difficulties for seed quarantine;
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What to Do About the Green Leafhopper on Rice? A Detailed Guide to Effective Control Methods
Scientific name: Homoptera, Delphacidae. Distributed in the wild rice stem (Zizania latifolia) and rice-growing areas of both southern and northern China. Hosts include rice, wild rice stem, and wild Zizania latifolia. Damage characteristics: adults and nymphs pierce and suck the sap of rice; affected leaves develop yellowish-white to light brown or reddish-brown spots, after which the leaves gradually turn yellow and dry up from the tip toward the base; excrement covers the leaf surface, forming a sooty mold-like coating; the female's egg-laying scars are initially water-soaked, then secrete white downy waxy powder; once wounds appear, the plant loses water, wilting in clumps and dying off in patches. Morphological characteristics: male adult body length 5-6.1 mm,
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Identification and Control Methods for the White-Winged Leafhopper in Rice
Scientific name Thaia rebiginosa Kuoh, formerly mistaken for Erythroneura subrufa (Motschulsky), belongs to the order Homoptera, family Cicadellidae. It is distributed south of the Yellow River and east of Xichang, Sichuan. Damage is severe in parts of the mountainous areas of Yunnan, Guizhou and Sichuan and in Hanzhong, Shaanxi. Hosts include rice, wheat, barley, sugarcane, wild rice stem, corn, rapeseed and others. Damage characteristics: adults and nymphs pierce and suck leaf sap; damaged leaves first show scattered small white spots, which later join into dotted streak marks, or white streak marks that eventually
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How to prevent and treat tulip leaf blight? A few practical methods to teach you
Symptoms: Infected leaf buds develop poorly, appearing deformed and curled; once young buds are affected, the leaves that grow from them become curled. If the environment is humid, a large number of gray mold-like conidia are produced on the diseased tissue, spreading to nearby healthy plants and causing leaf infection, so bulb growth is greatly affected. After flowers are affected, white or light yellowish-brown lesions first appear, then rapidly expand and cause the flowers to wither and drop, or turn brown and dry up. Ring-like bands also appear on the flower stalk, sometimes with a layer of conidia on them. At every stage of the disease
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Symptoms and Control Methods of Polygonatum Leaf Spot Disease
The disease begins in April to May. On affected leaves, elliptical or irregular lesions first appear at the leaf tip, with brownish outer edges and pale white centers; the disease spreads downward from the lesions, causing the leaves to wither and die. The disease is more severe during the rainy season. Control methods: 1) After harvest, clean the field and garden, gather the dead branches and diseased plant debris and burn them to eliminate the overwintering pathogen. 2) Before the disease occurs and in the early stages, spray 1:1:100 Bordeaux mixture, or 50% Tuzet (thiram) 1000x solution, once every 7 to 10 days, for 3 to 4 consecutive sprays.
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Heartleaf Philodendron Support and Climbing Methods and Solutions for Leaf Drop
Heartleaf philodendron is a plant grown in many homes and public spaces. How to support a heartleaf philodendron for climbing? What to do about leaf drop: How to support a heartleaf philodendron for climbing: First choose a moss pole, though other cylindrical poles can be used as a substitute, wrap it with a layer of brown outer covering, then insert the pole in the center of the flower pot
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How to Grow Thousand-Leaf Spider Plant in Water and Solutions for Leaf Drop
Thousand-leaf spider plant leaf drop is generally caused by watering and ventilation. How do you grow thousand-leaf spider plant in water? What to do about leaf drop: How to grow thousand-leaf spider plant in water: Choosing a hydroponic container. When growing thousand-leaf spider plant in water, you should choose a suitable container, preferably a transparent glass vessel, as this makes it easier to observe the growth condition of the thousand-leaf spider plant.
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When to Divide Broadleaf Lady Palm and Why It Is Not Suitable for Growing at Home
Broadleaf lady palm is also one of the plants, and a great many people know about it. So when should broadleaf lady palm be divided? Why is it not suitable to grow at home: When to divide broadleaf lady palm: Broadleaf lady palm division propagation is generally carried out in spring when repotting. (The best time for division is March to April.
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Causes and Solutions for Yellowing Leaves on the Thousand-Leaf Spider Plant
Now let's take a look together at the solutions for yellowing leaves on the thousand-leaf spider plant. What causes the leaves of the thousand-leaf spider plant to turn yellow? How to solve it: What causes the leaves of the thousand-leaf spider plant to turn yellow: The yellowing of the leaves of the thousand-leaf spider plant comes down to the following causes: too-strong light, or insufficient light, is one cause
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