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Key rice diseases to focus on controlling in Guangdong currently
Bacterial leaf streak, rice blast, sheath blight and bacterial leaf blight are the four major diseases in late rice production in Guangdong, mainly damaging the leaves of plants in the early and middle stages of rice growth. The coastal typhoon-prone rice areas of our province are frequent-occurrence areas of bacterial leaf streak, while hilly and mountainous areas are mainly affected by rice blast and bacterial leaf streak. The occurrence periods, characteristics and control methods of bacterial leaf streak, rice blast and sheath blight are briefly described as follows: Bacterial leaf streak. Rice bacterial leaf streak has shown a spreading trend in Guangdong in recent years. The disease starts at the seedling stage and breaks out severely at the young panicle differentiation stage. Ty
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What are the methods for controlling pests and diseases of honeysuckle?
The main pests and diseases of honeysuckle are honeysuckle brown spot disease, which harms the leaves and occurs from July to August. After the disease develops, the spots on the leaves are round or polygonal due to the restriction of leaf veins, yellow-brown, and in humid conditions there is a gray mold-like substance on the underside of the leaves. Effective control methods are to promptly remove diseased branches and leaves, strengthen cultivation management, and increase the application of organic fertilizer to enhance disease resistance. In addition, spraying Bordeaux mixture at a ratio of 1:1.5:200 in the early stage of the disease can effectively control brown spot disease. The main insect pests of honeysuckle are aphids and coffee tiger longhorn beetles. To control aphids, 40% dimethoate emulsifiable concentrate 10
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Four Major Pests to Focus on Preventing and Controlling in Garlic Cultivation
Garlic has medicinal properties and generally does not contract diseases, so it rarely develops illness, which is already widely known. However, garlic can only suppress the occurrence of certain diseases; it cannot suppress the harm caused by pests. For pests such as aphids, seed maggots, thrips, and leafminers, careful prevention and control should be carried out to ensure garlic quality and improve cultivation benefits: 1. Aphids The aphids that mainly harm garlic include: turnip aphid, cotton aphid, green peach aphid, and mustard aphid, appearing respectively in yellow, green, yellow-green, and some in cherry red. When temperatures are higher, they are more favorable for continued reproduction and
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16% Exianqing is the first choice for controlling rice "small panicle head"
For many years, in some major rice-producing areas such as Jiangsu, the phenomenon of "small panicle head" (also called small-grain distorted panicle) has appeared continuously over many years under multiple varieties, multiple planting levels, and multiple ecological conditions in large-scale production. Its characteristics are: small panicles, small glumes, cracking of the inner and outer husks after grain filling, partial exposure of rice grains, and small grains with dark brown color. It is especially severe in the Lixiahe area, coastal areas, along the Huai River, along the Yangtze River, and hilly areas of Jiangsu Province. It is estimated that in recent years the affected area in Jiangsu Province alone has been about 100,000 hectares each year, reducing rice output by more than 100 million kg, and cumulatively causing about 500 million kg of rice yield loss.
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Methods and Technical Key Points for Controlling Pests and Diseases of Oyster Mushrooms
In oyster mushroom cultivation, pests and diseases are a stumbling block. Recognizing and promptly controlling them is of great significance for normal production. Once pests and diseases are discovered, if measures are not taken in time, they will seriously affect oyster mushroom yields and sometimes cause total crop failure. Therefore, superior and highly resistant strains should be selected, scientific management should be strengthened, and environmental conditions that favor the growth of the mushroom fungus while disfavoring the reproduction of pests and diseases should be created, so as to prevent trouble before it happens. The following are introductions to the control methods for some common pests and diseases: 1. Diseases. Diseases commonly fall into the following two categories: (1) During the cultivation process,
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Detailed Guide to Controlling Common Diseases of Oyster Mushrooms
On cloudy days, with insufficient light, high relative humidity inside the mushroom shed, and poor ventilation, oyster mushrooms are extremely prone to two concurrent diseases: soft rot and bacterial spot disease. So how can these concurrent diseases be prevented and controlled? Based on our practical experience, we hereby introduce the following integrated control methods to mushroom growers. 1. Select and breed disease-resistant varieties and cultivate vigorous mycelium to improve the disease resistance of oyster mushrooms. For example: Hebei Wubaozi, Jiangsu Yefeng, etc., whose mycelium grows snow-white, whose fruiting bodies have strong disease resistance, and whose yields are high. 2. Increase ventilation to purify the air environment. 3. Use the ditch water replenishment method
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Detailed Guide to Controlling Leaf Spot Disease in Rhododendrons
Symptoms: It mainly infects the leaves. In the early stage of the disease, small reddish-brown spots appear on the leaves and gradually expand into lesions or irregular polygonal lesions that are dark brown. In the later stage, the tissue in the center of the lesions turns grayish-white. When the disease is severe, the lesions connect with one another, causing the leaves to turn yellow, wither, and drop early. Control methods: 1. In autumn, clear away and dispose of fallen leaves, and during the growing season promptly remove diseased leaves. 2. Planting or potted flower placement density should be appropriate to ensure ventilation and light penetration for the plants and reduce leaf surface humidity. In summer, place potted flowers in an outdoor shade shed to reduce sunscald and mechanical
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What are the methods for controlling aphids during the cotton seedling stage?
The suitable temperature for cotton seedling aphids is 18°C to 25°C, and after rain the temperature rises quickly, which is very suitable for seedling aphids in terms of temperature, and there is a possibility of a heavier outbreak of seedling aphids. 1. Agricultural control: eradicate weeds in cotton fields, strengthen water and fertilizer management, and promote early development of cotton seedlings; combined with thinning and final thinning of seedlings, pull up aphid-infested plants and carry them out of the field to be burned in a concentrated manner. 2. Chemical control: before the seedlings have 3 true leaves, when the rate of curled-leaf plants reaches 5% to 10%, and after 4 true leaves when the rate of curled-leaf plants reaches 10% to 20%, use 10% imidacloprid wettable powder
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Detailed Methods for Controlling Pests of Tropical Orchids (Part Two)
5. Whiteflies. Whiteflies are pests of the family Aleyrodidae in the order Homoptera. The insects are relatively small, with white powdery waxy material covering the whole body, and they usually cluster on orchid plants. They are prone to occur when ventilation in the orchid greenhouse is poor. They often damage the new shoots, tender leaves and flower buds of orchids. When causing damage, they insert their piercing-sucking mouthparts from the underside of the leaves, sucking the sap from the plant tissues, causing the leaves to turn yellow and withered, and they often excrete large amounts of honeydew at the wound sites, causing sooty mold and the occurrence of brown rot, and even causing the death of the entire plant. Because whiteflies have strong reproductive capacity, they can reproduce 9~10 generations within a year in a greenhouse, and can form a huge
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What medicine is effective for controlling cotton red leaf disease?
Control the top and promote the bottom to enhance the stress resistance of cotton plants. First, for cotton with vigorous growth, apply the plant growth retardant succinic acid or mepiquat chloride to control excessive growth; use 2-3 grams of mepiquat chloride or 8-12 milliliters of mepiquat chloride per mu, mixed with 50 kg of water for spraying. Second, for cotton fields with compacted soil, cultivate and aerate in time to enhance permeability. Third, for cotton fields in low-lying areas, pay attention to clearing ditches and beds at any time to promote cotton roots to grow downward. Fourth, for cotton fields using plastic film mulching cultivation, remove the plastic film immediately so that cotton roots develop deeper. Apply more potassium fertilizer to improve fertilization efficiency. For soil
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