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Symptoms and Control Methods of Cotton Leaf Blight
Symptoms Also known as cotton Cercospora leaf spot. It mainly damages leaves. Infection usually occurs in the late growth stage of cotton. At first, many dark red small spots appear on the leaves, then expand into nearly round lesions with purplish red, slightly raised edges and brown centers. Under moist conditions, a white mold layer forms, which is the pathogen's conidiophores and conidia. Affected leaves break very easily. Pathogen Mycosphaerella gossypina (Cooke) Earle, called cotton ball fungus, belongs to the Ascomycota fungi. The ascocarp is spherical and black, and the ascospores
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What are the control methods for southern blight in orchids?
Southern blight is caused by the fungus Selerotiumrolfsii, which harms the stem base and roots from seedlings to mature plants, and Cymbidium hybridum is more susceptible to this disease. When the disease occurs, white mycelium can be seen at the stem base, the stem base turns brown, the roots dry up, and a large number of small brown sclerotia form, causing the plant's stem base to soften and die. This pathogen has a very wide host range and causes more serious damage to bulbous flowers and perennial flowers. It also has strong saprophytic ability and can survive for a long time in the substrate or old pots through sclerotia. This fungus can also infect Phalaenopsis
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What effect does light have on the growth and health of pigs
Lighting in pig houses can be divided into natural lighting and artificial lighting according to the light source. Natural lighting refers to direct sunlight and scattered light entering the pig house through light-transmitting structures such as doors and windows for illumination. In the solar spectrum, visible light accounts for 50%, and most of the remaining 50% is infrared light, with a small amount being ultraviolet light. Natural lighting in a pig house is generally expressed as the ratio of the total light-transmitting area of the pig house to the floor area inside the house, which is called the lighting coefficient. Artificial lighting uses artificial light sources (incandescent lamps or fluorescent lamps, etc.) for illumination. In the spectrum of incandescent lamps, infrared accounts for 60%
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A Detailed Guide to the Occurrence and Control of Spruce Red Blight
In recent years, with the increase in the number of spruce plantings, spruce red blight has occurred severely, reaching as high as 50% in some dense forest belts, seriously weakening tree vigor and even causing tree death. The disease strikes swiftly, developing from the lower part of the tree to the upper part, from the outer edge of the crown toward the inner part, and from the base of the compound leaves toward the tip. In as little as 1 week, or at most 10 days, it can cause the leaves of the entire plant to turn yellow and then drop. The disease is caused by fungi. When temperature changes abruptly and humidity increases, the tree becomes diseased. Diseased leaves first develop small brown spots, which then expand and turn dark brown; when it rains and is humid,
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Symptom Identification and Control Methods for Spruce Snow Blight
[Distribution and Damage] Abroad, it is distributed in North America, Northern Europe and Central Asia, damaging Norway spruce (Picea abies), white spruce (P. glauca), black spruce (P. mariana), etc. In China, it is distributed in the Tianshan Mountains, the Altai Mountains, the western mountains of the Junggar Basin and the Kunlun Mountains. It damages Schrenk spruce (P. schrenkiana), Siberian spruce (P. obovata), Qinghai spruce (P. crassifolia) and Sichuan spruce (P. balfouriana).
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How to prevent and control spruce snow blight? A detailed guide to practical methods
Snow blight damages spruce needles, turning diseased needles reddish-brown. Snow blight develops under snow; ascospores invade spruce needles covered by snow, mature each year from September to October, and then spread by wind and rain. Observations show that in young stands after artificial regeneration and reforestation, the dense planting of the past created a "hand-in-hand" situation, and once the disease breaks out it spreads especially severely; after half of a plant's needles are infected, lose their green color and turn reddish-brown, the entire plant dies. The uncrowned regeneration land at Tekes Forest Farm covers nearly 2666 hectares. In order to ensure the
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Symptoms and Control Methods of Spruce Felt Blight
[Distribution and Damage] This disease occurs in the Songhua River area and Yichun forest region of Heilongjiang Province, damaging 16-21 year old plantations of Picea koraiensis (Korean spruce). In affected stands, naturally regenerated young trees of Abies nephrolepis (Khingan fir) and Pinus koraiensis (Korean pine) are also susceptible. A felt-like mycelial layer grows on branches and needles, causing wilting and felt blight. It spreads from the lower crown upward, expanding in a cone shape along the trunk.
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What are the control methods for Metasequoia red blight?
Control methods for Metasequoia red blight: 1. Strictly enforce plant quarantine, prohibit the introduction of diseased seedlings into new areas, and immediately remove and burn any diseased seedlings found. 2. Do not plant seedlings too densely. Ensure ventilation and light penetration, reduce air humidity, apply more phosphorus and potassium fertilizer, and less nitrogen fertilizer, to promote robust seedling growth and improve disease resistance. 3. During the disease period from April to May and September to October, spray 1:1:200 Bordeaux mixture, or 50% Tuzet wettable powder at 500 to 1000 times dilution, 25% carbendazim
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The role of sunlight and rain in peach cultivation
In 1981, it was bred by the Institute of Horticulture, Jiangsu Academy of Agricultural Sciences through a cross of Zhaohui × Yuhualu. The original code was 81-8-83, and it was named in 1994. The fruit is round; the average single fruit weight is 110 grams, and the largest fruit weight is 174 grams; the skin is creamy yellow, with a rose-red blush on the fruit surface; the flesh is milky white, soft and juicy, with a rich sweet flavor and aroma; soluble solids 11.1%. Clingstone. In the Nanjing area, the fruit ripens around June 10, and the fruit development period is 70 days. This variety is early-bearing, high-yielding, widely adaptable,
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Cotton red leaf blight is prone to outbreak after heavy rain, growers need to be vigilant
Recently, cotton regions have generally experienced heavy to torrential rain, and for cotton that has endured a long drought, red leaf blight is extremely prone to outbreak. Cotton red leaf blight is a physiological disease. It starts from the main stem growing point or the top of the fruiting branch, and generally develops from top to bottom and from outside to inside. The main stem withers and dies, but the dissected vascular bundles show no discoloration. The root system is thick and short, with few fibrous roots and poor development. The causes of cotton red leaf blight outbreaks are: first, extensive farming in cotton fields, resulting in poor cotton root development; second, cotton fields with poor drainage; third, excessive application of nitrogen fertilizer, vigorous cotton growth,
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