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Identification and Control Methods of Cotton Seedling Red Rot
Symptoms This disease occurs in all cotton regions of China, with severe damage in the Yangtze River Basin and Yellow River Basin cotton regions, and it also occurs in the Liao River Basin. It can infect plants at the seedling stage and boll stage. When infected at the seedling stage, the young sprouts are damaged before emergence, and the sprouts become reddish-brown and rot. After emergence, the roots of affected cotton seedlings show yellowing of the root hairs and lateral roots, which later turn blackish-brown and rot. When the young stem is infected, the vascular bundles turn dark brown, yellow streaks appear at the base of the young stem near the ground, and later turn brown and rot. The young roots and young stems swell, and grayish-red irregular spots form on the edges of the cotyledons and true leaves. Under high humidity, a pink mold layer forms on the surface, which is the pathogen
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What to Do About Manganese Deficiency in Cotton? Symptom Identification and Remedies
Young leaves first develop stripes of dark green alternating with light green between the veins, and this is more pronounced in the middle of the leaf than at the tip. The leaf tip initially turns light green, and small patches of dead spots appear within the white stripes, which later join into strips of dried tissue and cause the leaf to split lengthwise. Symptoms tend to occur on the upper part of the plant and on young tender leaves from the early squaring stage to flowering. Triggering conditions: low available manganese in plots with pH 7, high sand content and low organic matter content, and excessive rain makes it prone to leaching. Fertilization method: basal application of Liugao Base Fertilizer King is best, or choose 0.2%
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Identification of Honeysuckle Disease Symptoms and Control Methods
Brown spot disease is a common leaf disease that causes plants to grow weakly. It mostly occurs in the middle and late growth stages, with August and September being the peak period of onset, and it is severe under rainy and humid conditions. In the early stage of onset, small brown spots form on the leaves, then expand into brown round lesions or irregular lesions. Grayish-black mold-like substances grow on the underside of the lesions. When the disease is severe, the leaves fall off, affecting plant growth and flowering. Control method: prune diseased leaves, then spray with 1:1.5:200 Bordeaux mixture, once every 7 to 10 days, for 2 to 3 consecutive times. Powdery mildew occurs under warm and dry
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Symptom Identification and Control Methods of Licorice Rust
Latin scientific name: Uromyces glycyrrhizae Magn. Crops affected: Licorice. Symptoms: Mainly affects leaves. After seedlings emerge in spring, round, grayish-white small blister spots appear on the underside of leaves, and later the surface ruptures to reveal yellow-brown powdery masses, which are the pathogen's uredinia and urediniospores. In the late stage of the disease, the entire leaf is covered by uredinia, causing the aboveground part of the plant to die; the phloem tissue at the junction of the stem base with the root or stem proliferates, latent buds sprout, and the plant becomes clustered and dwarfed. After reinfection by urediniospores,
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Identification and Control Methods for the Rhododendron Lace Bug
Also known as the pear lace bug and pear flower lace bug, it belongs to the order Hemiptera, family Tingidae. It is distributed throughout the country. The nymphs and adults damage potted ornamental plants such as rhododendrons, Chinese roses, camellias, banana shrubs, jasmine, wintersweet and Chinese wisteria. Damage symptoms: both adults and nymphs gather on the undersides of leaves to pierce and suck the sap, and the undersides of the damaged leaves show a black sticky substance that looks very much like splattered dirt. This feature makes it easy to distinguish from other sap-sucking pests. The entire underside of the damaged leaf turns rusty yellow, while the upper surface develops many pale spots; when the damage is severe, the spots merge into patches, so that the whole leaf loses its green color and looks pale from a distance.
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Identification and Control Methods of Rhododendron Flower Rot
Symptoms Rhododendron flower rot only harms the flowers, causing the flowering period to shorten, flowers to droop, and early withering and dropping. After the petals are infected, the diseased parts lose their luster, become water-soaked, soft and discolored, and finally turn brown, rot and blacken; when humid, a gray mold layer grows on the surface, affecting ornamental value. Pathogen and disease pattern This disease is caused by a fungus of the class Hyphomycetes, subphylum Deuteromycotina. The pathogen forms sclerotia on rotten flowers, and the sclerotia fall into the soil with the spent flowers to overwinter. In the flowering period of the following year, conidia are produced, spread by wind and rain or air currents, and when the flowers sprout
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What are the classifications of common diseases in dogs?
Common diseases in dogs can actually be divided into several major categories: malignant infectious diseases, non-malignant diseases, functional diseases, and nutritional diseases. 1. Malignant infectious diseases: mainly canine distemper, canine parvovirus, infectious hepatitis, rabies and other highly contagious and fatal diseases. Among them, rabies is a zoonotic disease. These diseases have many routes of transmission and a relatively low cure rate. Although corresponding vaccines are now available, they are still the number one killer for puppies and dogs that have been vaccinated but whose resistance has dropped sharply for some reason (dogs recovering from a serious illness, dogs that have just given birth, dogs that have just undergone surgery, dogs that have just been bought). Therefore, vaccination for puppies and booster vaccination for those with low resistance are both very important. For these diseases, blood tests can provide results and enable early treatment.
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Symptom Identification and Control Methods for Peach Leaf Curl
Peach leaf curl is a common disease in spring, mainly affecting ornamental peach, cherry, apricot, plum and others. 1. Pathogen: The disease is caused by fungi of the class Taphrinomycetes in the phylum Ascomycota. 2. Symptoms: It mainly affects leaves, and in severe cases can also affect flowers, young fruit and tender shoots. After leafing out in spring, infected plants show shrivelled, rippled leaves with the leaf tip and margins curling backwards and the leaf surface uneven. As the leaves grow, the leaf colour gradually changes from yellow-green to purplish-red, the mesophyll thickens and becomes brittle, and the unevenness increases. In late spring and early summer, the leaf surface develops
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Symptom Identification and Control Methods of Ginger Eyespot Disease
[Pathogen scientific name] Drechslera spicifera (Bain) v. Arx [Host crop] Ginger. [Disease diagnosis] It damages leaves. When leaves are affected, small brown spots appear initially, and after expansion the lesions become spindle-shaped, 5-10 mm in size, grayish-white, with light brown edges and a distinct or indistinct yellow halo around them. When humidity is high, dark gray to black mold-like growth appears on both sides of the lesions. When the disease is severe, the lesions on the leaves merge into patches, causing the diseased plants to wither and die. The pathogenic fungus is Drechslera. The conidiophores of the pathogen are mostly solitary, straight and unbranched, olive-yellow, slightly lighter at the tip, with the basal cell swollen; the conidiogenous cells are mostly proliferating, with sympodial extension. The conidia are oblong-elliptical, with obtuse-rounded ends, straight, pale olive-yellow, and have 3-7 septa. The conidia are solitary or borne at the tip and sides.
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Symptom Identification and Control Methods for Ginger Leaf Blight
[Pathogen scientific name] Septoria zingiberis [Host crop] Ginger. [Disease diagnosis] It affects the leaves. When the leaves become diseased, small water-soaked spots appear at first, and after gradually expanding, the lesions become nearly fusiform, light brown, with a grayish-white center; later the lesions extend upward and downward into long streaks. Many small black dots are scattered on the lesions. In severe cases, the lesions may split longitudinally, and the leaves die. The pathogenic fungus is Septoria zingiberis. The pycnidia are superficial or borne on both sides of the leaf, spherical or subspherical, dark brown, and contain
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