Prevention and Treatment of Common Diseases of Eucommia
The diseases of Eucommia ulmoides include root rot, seedling blight, leaf blight, Duchenne spot, Eucommia brown spot, Dushen gray spot, and Eucommia branch blight. Root rot Symptoms: The bacteria first invaded from the fibrous roots and lateral roots, gradually developed to the main root, the root bark rotted and shrivelled, the leaves wilted in the shoots, the stems shrank, and the entire plant died. The xylem from the roots to the stems of the diseased plants showed irregular purple strips. After the leaves of the diseased seedlings did not dry off, the root bark of the diseased seedlings was generally left in the soil. Control methods: Choose a nursery. Should choose soil loose, fertile, irrigation and drainage conditions good land nursery, as far as possible to avoid the heavy nursery. Long-term cultivation of vegetables, beans, melons, cotton, potato plots is also not suitable for the eucommia nursery. Apply sufficient organic fertilizer before freezing in winter, and apply 1.5-2.3 tons of ferrous sulfate (height) per hectare to fully disinfect the soil. Acid soil spreads 0.3 tons of lime per hectare and can also achieve the purpose of disinfection. Select high-quality seeds and carry out germination treatment, strengthen soil management, loosen soil, and timely drainage, but also can effectively resist and prevent root rot. Chemical control: The seedlings should be sprayed in time for the initial onset to control the spread of the disease, and 50% thiophanate-methyl 400-800 times solution, 500-fold tetrazine solution, and 25% carbendazim 800-fold solution should be used for root irrigation. Disease effect. Saplings should also be promptly sprayed after the onset of disease prevention and control, the dead seedlings or saplings should be immediately excavated and burned, and fully sterilized in the pathogenesis. 2. Bacterial blight is also called damping-off disease. It occurs in various degrees in all producing areas, and it mainly harms the seedlings in the year. Symptoms: The seedlings show different symptoms at different stages of growth and development. Bud rot: After seedling emergence, the seedlings are unearthed or the seedlings have just been unearthed. The seed buds are infected by pathogens and cause the buds to rot and die. Low temperature, high humidity, soil compaction or overburden after sowing are susceptible to the disease. When the seedlings fell down and the seedlings were unearthed until the seedling stems became lignified, the pathogens invaded the base of the tender stems from an early age, and black contractures occurred, causing the stems to rot and the seedlings to fall down to death. After the seedlings are unearthed in various producing areas in the south, the severe weather in the rainy season may lead to the death of the seedlings. Cotyledons rot: After the seedlings are unearthed, the cotyledons are invaded by the pests and a wet, rotten-like lesion appears, causing the cotyledons to rot and the seedlings to die. The disease is felt when the humidity is too high, the seedlings are dense or the grass is too late. Seedlings stand dry: After the stems of the seedlings are lignined, the germs mainly infect the roots below the roots, causing the roots to rot and the diseased plants to die without lodging. Seedling blight prevention and treatment of root rot disease control methods. 3, leaf blight is a disease caused by fungi, more common in adult plants. At the early stage of disease, the leaves appeared brown round lesions, and then they continued to expand and spread over the whole leaf. The lesions are brown on the edge and white in the middle, sometimes breaking the perforation of the leaves, and when the leaves are severe, they die. Control methods: 1 Combined with clean gardens in the winter, clean litter, concentrate treatment, tightly sealed with soil, make it ferment and mature, which not only reduces the pollution of the disease, but also can compost. 2 At the early stage of disease, remove diseased leaves in time and dig deep. Avoid diseased leaves fluttering and spreading around. 3 After the onset of disease, spray 1:1:100 Bordeaux mixture every 7 to 10 days, and spray 2 to 3 times continuously. 4. Occurrence of Duchenne's leaf spot disease occurs in Dumu forest farms and nursery areas, harming the leaves and causing the leaves to die off and fall off. Symptoms: The lesions are mostly distributed in the middle of the leaves, showing irregular dark brown polygonal patches, and pale lesions on the back of the leaves. The lesions are gray-black moldy, which is the conidia and molecular spores of the pathogen. After autumn, there were spores of pathogenic spores on some of the lesions and scattered granular material. Finally, the leaves become dark and fall off. Control methods: The key to prevention and treatment of this disease lies in strengthening tending and strengthening tree vigor, and using l% Bordeaux liquid spray protection in time. 5, Eucommia brown spot disease damage the leaves, dead leaves fall and fall. It happens everywhere. Symptoms: The lesion starts with a tan spot and then expands into a reddish-brown, long block or oval-shaped large spot with obvious margins. The upper granules are gray and black, which is the fruiting body of the pathogen. Control methods: The incidence of forest can be controlled according to the method of prevention and treatment of Duchenneia. 6. Gray leaf spot of Eucommia ulmoides affects the leaves and young shoots. When the leaves are severe, diseased leaves fall early, weakening the tree vigor and affecting plant growth. According to a survey conducted by the Guizhou Province, this disease has occurred more severely in the Eucommia ulmoides in the two counties of Zhangtan and Zunyi in the province. For example, Du Zhonglin in Songlin Township of Zunyi County has a gray spot incidence of 100% and a disease index of 57. Symptoms: The disease starts from the edge of the leaf or the veins first. It appears as a purple-brown or light-brown near-circular spot at the beginning, and then expands into gray or gray uneven patches. The spots are scattered on the black moldy spots. Twig shoot lesions dark brown oval or spindle-shaped, after the expansion into an irregular shape, late black mold, severe shoots withered. Control methods: Tender management should be strengthened, tree vigor enhanced, and source of infestation removed. Prior to germination, shoots of overwintering pathogens were sprayed with 0.3% sodium pentachlorophenol or Baume 5 degree lime sulfur. The onset period was sprayed with 50% thiophanate-methyl or 400-600-fold or 5% carbendazim 1000-fold. 7. Eucommia branch blight This disease harms the stems of eucommia ulmoides and causes the leaves to fall early and branches to die. According to a survey conducted by Duzhong Forest Farm in Zunyi, the hazard ratio of branch blight is 20%, and the index is 5. Symptoms: The disease mostly occurs on lateral branches. First the collateral tip is sick and then spreads to the base of the shoot. The cortical necrosis of the susceptible branch changed from gray-brown to reddish-brown, and there were needle-like granules under the cortex of the diseased part in the later period, ie the conidia of the pathogen. When the disease department develops into a ring, it causes the branches to die. Control methods: To promote robust growth of forest trees and prevent various wounds is an important measure to prevent and treat this disease. Diseased and dead branches should be trimmed, cut together with the Ministry of Health for a period of time. The wounds are sprayed with 50% eutectic 200 times liquid, and can also be cut with Bordeaux mixture. In the early stage of disease, spraying 65% zeocin zinc wettable powder 400 to 500 times liquid, once every 10 days, spray 2 or 3 times. Testing Equipment,Clinical Testing Equipment,Vacuum Blood Collection Tube,Disposable Virus Sampling Tube Henan Anbang Medical Supplies Co., Ltd. , https://www.anbangmedical.com