Poplar bacterial ulcer disease and rotten skin disease are mainly distributed in the northeast, northwest, and north China. It is a common and frequently occurring disease in northern China's shelterbelts, timber forests, and urban and rural afforested poplar trees.
Poplar bacterial ulcer disease and rotten skin disease are the world-famous diseases of poplar tree, and they are also common and frequently-occurring diseases. Its infectious bacteria are widely found in nature and can lurk in the poplar tree for long periods of time.
First, the incidence of factors. This type of disease is directly proportional to the degree of frost damage, sunburn, insect damage, salt damage, and drought damage.
Planting large seedlings or saplings with excessive seedlings, too many transplants, and too long prosthesis will not be easy to restore their vitality after transplantation, or it will be beneficial to the onset of diseases due to poor pruning techniques, excessive trimming, and excessive mechanical damage.
In addition, most poplar cultivars will experience serious morbidity in areas or years where environmental conditions are poor and cultivation practices are unfavorable, such as drought, blisters, sunburn, and frost damage, and the disease will occur rapidly, causing huge losses.
Second, the symptoms. This type of disease endangers the dryness of poplar branches. In the early spring and early summer, the diseased department developed dark brown water-stained lesions that formed small tumor protrusions on the young shoots, and some of the raised plaques gradually lost water, followed by shrinkage and depression, and even cracks. Peeling can be seen in the subcutaneous layer formation rotting, and the discoloration of the phloem and xylem in the brown area of ​​the xylem appears on the surface of the xylem.
The discolored area begins to crack in the summer and flows out of brown mucus, which has a bad smell. When the disease develops into the late stage, the tumors form continuously and the wounds continue to expand without healing. When the dense black spots occur in rain or when the humidity is too high on the depressed skin, the milky white paste is extruded from the top of the black spots and gradually develops. Becomes orange. If the disease is serious, go up to the branch, down to the root, the wood is discolored, the center rots, and dead branches form.
Third, the incidence of law. The pathogenic bacteria lurked in the diseased or diseased skin of poplar diseased plants for many years. During the wet and rainy days in the spring of the next year, the pathogenic bacteria began to be active (in northern China, the disease began in mid- and late March, in the northeast, it was later, and in May-June it was During the period of disease, the disease became milder in July, and development ceased in September), and the spread of mucus from the cracks was spread.
The spread of germs is assisted by rain, wind, insects, birds and human activities. It invades through poplar holes, leaf marks, stifle marks, bud scale marks and various wounds. The mucus produced by the disease poplar is an important source of infection.
Fourth, prevention and control measures. 1 Strictly carry out quarantine. It is forbidden to transport diseased seedlings and cuttings, and disinfect suspicious seedlings and cuttings. For the introduction of seedlings, cuttings and other vegetative propagation materials, we must first isolate the test species and prove that they are not disease-free and then plant them. 2 Use disease-resistant varieties instead of susceptible varieties to prevent bacterial canker disease. 3 Diseased plants were found to be cleared and burned in time. 4 Prevention was heavier than treatment: In the early spring and late autumn season, Tianlin plant energy mixture 600 times liquid + Tianda 2116 cell membrane steady state agent 600 times liquid + Tianda organic silicon 6000 times liquid was sprayed.
For diseased trees, use Tianda 2116 cell membrane stabilizer 50 times solution + Tianlin plant energy mixture 50 times solution + Tianda silicone 100 times solution to dry, enhance tree vigor, and quickly repair.
The Stethoscope is alos ORIENTMED's main product. We have get the CE, ISO and FDA for the Stethoscope. Our Stethoscope For Sale.
With credible quality and professonal service, ORIENTMED satified may clients in the past few years. As the largest aneriod sphygomanometer supplier, we are able and glad to meet all of our clients expectations with the most detailed features. Some feature are not listed in this catalog. However, we are experienced in developing new features and technology as requested. If you have any requirement, welcome to contact us.
ORIENTMED aim to pharmacy products. For health! Professional service, we will do better!
Stethoscope
Electronic Stethoscope,Pediatric Stethoscope,Doctors Stethoscope,Stethoscope For Sale
Hebei Orient Imp. & Exp. Co. Ltd. , https://www.orientmedcare.com