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Symptom Identification and Control Methods of Peach Shot Hole Disease
Peach shot hole disease is the most common leaf disease on peach trees. It occurs in peach-producing regions worldwide. It includes three types: bacterial shot hole, mildew spot shot hole, and brown spot shot hole. Among them, bacterial shot hole is the most common and is widely distributed in peach-producing regions across the country. Infection of peach trees by this disease can cause a large number of leaves to develop holes and drop off, branches and shoot tips to die, severely weakening tree vigor, affecting flower bud differentiation, and causing huge losses. In addition to harming peach trees, the three types of shot hole disease also harm stone fruit trees such as plum, apricot, and cherry. [Symptoms] Detailed
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Symptom Identification and Prevention Methods for Potato Cold Injury
During plant growth or during tuber storage, if the air temperature or soil temperature is too low (above freezing), the plant will suffer cold injury. The degree of cold injury varies with the temperature. 1. Leaf symptoms At the seedling stage, after the plant suffers freezing injury, the leaves quickly wilt and collapse. When the temperature becomes warmer, the affected parts become water-soaked and turn brown after dying. However, if the plant suffers only cold injury, the above symptoms will not appear. Cold injury occurs at the seedling stage in early spring. The symptoms appear at the top of the seedlings, showing light yellow to light brown at the base of the young leaves. When
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What are the identification methods for the Chinese medicinal herb Schisandra chinensis?
Schisandra is divided into Liao Schisandra and Shan Schisandra, both traditional Chinese medicinal herbs with a long history of use. In recent years they have sold very well, especially last year when Korean pharmaceutical traders came to China to purchase large quantities of Liao Schisandra, causing the price to soar to around 70 yuan. As the price of the medicinal herb rose, unscrupulous traders tried every means to adulterate and counterfeit it. When the price of Liao Schisandra was high, they mixed Shan Schisandra into it for sale. Now the prices of Liao Schisandra and Shan Schisandra are similar, and both remain high, so they have mixed in the seeds of a wild type of cultivated mountain grape. To improve everyone's identification ability, the following
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Symptom Identification and Control Methods for Mushroom Brown Blotch Disease
Mushroom brown blotch disease, also known as dry bubble disease, is fairly widespread and occurs frequently on mushroom beds, causing great damage. Symptoms: When the disease occurs, brown spots usually form on the stipe, cap, and gills, and become sunken; the mushrooms often lose their firmness and become deformed. In severe cases, the mushrooms rot. Diseased young mushrooms are mostly deformed, with the edge of the cap appearing serrated, or the stipe bending; some look like garlic bulbs, with the stipe thicker than the cap. When large mushrooms are affected, localized brown spots usually appear; the diseased mushrooms later dry out and become leathery, and a gray mold layer forms on the diseased parts. Unlike white rot disease, the diseased mushrooms rot
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Symptom Identification and Control Methods for Carnation Rust
[Pathogen] Uromyces caryophyllinus (Schrank) Wint., belonging to the fungal subphylum Basidiomycotina, genus Uromyces. It is a heteroecious rust fungus. [Symptoms] The disease mainly damages leaves, and also damages stems and calyx. The affected parts initially show pale small raised spots, which later turn yellow around the edges. In severe cases, leaves and stems become distorted. During the growing season, brown small powdery masses appear on the underside of infected leaves or on stems and calyx lobes; these are the uredinia of the pathogen. In autumn and winter
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Symptom Identification and Control Methods of Carnation Necrotic Fleck Disease
[Pathogen] Carnation necrotic fleck virus (Carnationnecroticfiackvirus, CaNFU), thermal death point 40-45°C, in vitro survival period 2-4 days at 20°C. [Symptoms] Grayish-white, pale yellow, or purplish-red necrotic spots or streaks appear on the leaves, and the streaks are often parallel to the leaf veins. Older leaves are more severely affected, and the disease spreads upward. In severe cases, the entire leaf turns yellow and necrotic.
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Symptom Identification and Control Methods of Carnation Viral Diseases
Carnation viral disease is a worldwide disease, occurring in all cultivation regions. The common viral diseases are vein mottle disease, necrotic spot disease, etched ring disease, and latent disease. Viruses often cause carnations to grow weakly, with short flower stems, smaller flowers, mottled petals, and split calyces, severely affecting the quality and yield of cut flowers. (1) Carnation necrotic spot disease: the middle leaves of infected plants turn grayish-white, showing pale yellow necrotic mottling, or irregularly shaped streaks or stripes. The lower leaves often show purplish-red streaks or stripes. As the plant
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Identification and Control Methods for Southern Blight in Carnations
[Distribution]Shanghai, Hangzhou. [Symptoms]The disease occurs at the base of the stem near the soil surface, turning brown and rotting; when the diseased stem tissue is cut open, a tea-brown or dark brown rot develops from the outside toward the center; the xylem also discolors upward, and white mycelium growing in a feathery, radiating pattern can spread to the surrounding soil surface; afterward, on the diseased area and the surrounding soil surface mycelium, sclerotia form that are initially white and later turn yellow-brown, the size of rapeseeds; after a plant is infected, it usually collapses and dies as a whole. On cutting beds, wet rot begins at the callus formation area of the cuttings and can also cause severe root
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How to Identify Mushroom Quality? Practical Identification Methods Taught to You
Mushrooms are a major category of edible fungi, divided into two types: wild mushrooms and artificially cultivated mushrooms. There are many kinds of wild mushrooms, and their shapes and species vary depending on the geographical environment and climatic conditions in which they grow. The variety of artificially cultivated mushrooms is increasing day by day. The most popular ones on the market include enoki mushrooms, shiitake mushrooms, oyster mushrooms, and phoenix-tail mushrooms. Good-quality edible mushrooms -- have the normal commercial appearance of edible mushrooms, with color matching their variety, normal odor, no off-flavors, pure variety, uniform size, and must not be mixed with non-edible fungi.
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Symptom Identification and Control Methods of Potato Blackleg
[Pathogen scientific name] Erwinia carotovora var. atroseptica (Van Hall) Dye. [Host crops] Many crops in the Solanaceae, Cucurbitaceae, Fabaceae, Apiaceae and other families. [Disease diagnosis] It can occur throughout the entire growth period, mainly damaging the root-stem area and tubers. When seed potatoes are heavily infected, sprouts rot before emergence, or emerged seedlings die quickly; in mild cases, symptoms appear successively when seedlings are 10-20 cm tall. Diseased plants are stunted, yellowed and dwarfed, and the cortex and
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