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Four key passes must be secured in controlling rice sheath blight
In recent years, sheath blight has risen to become the most important disease of rice, and it has four major characteristics: First, it occurs over a wide area. Second, there are very few varieties resistant to sheath blight. Third, the degree of damage is increasingly serious, even causing the plants to break through the top and lodge. Fourth, it first develops on the lower part of the rice plants, making it easy to overlook and miss the favorable timing for control. In control strategy, strictly securing the four passes is the key. 1. The pass of salvaging sclerotia - sheath blight mainly overwinters in rice fields in the form of sclerotia, and overwintering sclerotia generally have 60%-70% able to germinate from winter and spring through to early rice transplanting. The vast majority of sclerotia are lighter than water and can float with the water for a long time. After the rice field is irrigated,
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Control Methods for Soybean Bacterial Blight
Symptoms: It damages seedlings, leaves, petioles, stems and pods. When seedlings are infected, the cotyledons develop semicircular or nearly circular brown spots. When leaves are infected, irregular chlorotic small spots initially appear, water-soaked, and after expanding they become polygonal or irregular in shape, about 3-4mm in size, with the center of the lesion dark brown to blackish brown, surrounded by a narrow chlorotic halo ring, and after the lesions merge they form dead necrotic patches. When the stem is infected, it initially presents as dark brown water-soaked elongated strips, which after expanding become irregular and slightly sunken. When pods and seeds are infected, dark brown streaks
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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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What are the control methods for southern blight in jasmine?
Jasmine southern blight is the most serious disease of jasmine. When the disease is severe, it causes the plants to wither and die, greatly affecting yield. [Distribution] Suzhou, Hangzhou, Shanghai, Nanjing, Fuzhou, Taiwan, China. [Symptoms] The disease occurs at the root crown and roots, and under suitable conditions can spread to the lower leaves. The root crown area turns brown and rots, gradually spreading and expanding, producing a white silky film, mostly radiating outward, especially noticeable at the edges. The silky mycelium can spread to the soil near the root crown, and in severe cases the entire pot of soil is filled with white mycelium, which
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How to prevent rice sheath blight? Beware of high temperature and high humidity weather
Sheath blight, also known as banded leaf blight, has a great impact on the growth and development of rice. It not only weakens the absorption capacity of the root system, but also affects the photosynthesis of leaves, resulting in an increase in empty and shriveled grains, a decrease in 1000-grain weight and a decline in yield. Therefore, attention should be paid to the prevention and control of sheath blight in production. The following introduces the main symptoms, occurrence characteristics and control methods of this disease for reference. Main symptoms When rice leaf sheaths are infected, small dark green water-soaked spots with blurred edges appear near the water surface, later expanding into oval or cloud-like shapes, with the center grayish green
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Symptom Identification and Control Methods for Hydrangea Bud Blight
Hydrangea bud blight is also known as hydrangea gray mold. It damages the buds and flowers of the plant. Symptoms: In field-grown plants, it easily occurs in dense spherical flower clusters, causing them to develop water-soaked rot. In greenhouse cultivation, buds are prone to turning black and withering. Pathogen: The pathogen is Botrytis cinerea Pers., belonging to the Deuteromycotina, Hyphomycetes, Moniliales, genus Botrytis. Disease pattern: The pathogen overwinters as mycelium in diseased plant debris. In the following spring, it produces conidia
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How to prevent and control rice red blight? These 4 methods work fast
After good early growth, rice enters the reproductive growth stage of the middle and late periods. Strengthening field management at this stage has a great relationship with the yield and quality of rice. So, how can field management in the middle and late stages of rice growth be done well? 1. Timely field drying. Field drying should generally be carried out when rice is not sensitive to water reaction, that is, it is more suitable from the late tillering stage to the early young panicle differentiation stage. The following principles should be followed during operation: fields with sufficient and vigorous seedlings should be dried appropriately earlier; where the mud foot is deep and there is excessive growth, drying should be heavier, otherwise lighter; fields with poor water retention should not be dried heavily; saline-alkali paddy fields generally cannot be dried.
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Detailed Explanation of Prevention and Control Methods and Key Technical Points for Panax notoginseng Blight
Blight, also known as "leaf-drooping rot," begins to occur from April to May, and becomes severe from July to August. After being affected, dark green irregular lesions appear on the leaves or petioles, and the lesion color then deepens. The affected parts become soft, and the leaves look as if they have been scalded with boiling water, appearing semi-transparent, and later dry up or droop and stick to the base of the stems. Prevention and control methods: First, after harvesting the fruit, cut off the aboveground parts, clean the field, and spray the bed surface with 1-2 degrees Baume lime sulfur mixture for disinfection. Second, before the disease occurs, spray 1:1:200 Bordeaux mixture or 50% carbendazim 1000x solution, once every 7 days, for
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Induced biochemical responses in tea plant leaves after infection by the tea blister blight pathogen
The activities of enzymes such as phenylalanine ammonia-lyase, polyphenol oxidase and peroxidase, as well as the levels of proteins, proline and phenolic compounds in the leaves, were studied after tea plant leaves were infected by the tea blister blight pathogen. The study showed that in diseased leaves the activity of phenylalanine ammonia-lyase decreased, while the activities of peroxidase and polyphenol oxidase increased. Analysis of peroxidase isoenzymes by polyacrylamide gel electrophoresis using benzidine as substrate showed that healthy tea plant leaves had 4 isoenzymes, whereas
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How to prevent and control leaf blight in Schisandra chinensis? Practical tips shared
Leaf blight in Schisandra chinensis mostly occurs from late May to mid-July, with the lesions appearing scorched yellow. It initially starts at the leaf tip and gradually expands and spreads; in severe cases, the entire leaf turns yellow and dies. The disease is severe under high temperature and high humidity with poor ventilation. Control methods: spray with 400-500 times zineb and 1500 times thiophanate-methyl; it is best to spray once a week before the disease occurs, for 2-3 consecutive sprays, or use Bordeaux mixture sprayed once a day.
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