Poplar rotten disease is a common and frequently-occurring disease, and it is extremely harmful to poplars, willows, sorghum and other tree species. The disease is a latent infective disease. When diseases such as drought, blisters, sunburn, and frost damage occur, and if it is difficult to restore the vigor of the trees after transplanting seedlings or strength pruning, the diseases will occur quickly. The light will affect the growth of the trees, and the leaves will appear late, the leaves will become smaller, and the dead branches will appear. Diseases such as dry, dry, etc., causing severe death of the trees.
Disease symptoms
The disease occurred in the branches and trunks of poplars and willows. At the beginning of the disease, irregular bulges appeared in the skin and the touch was soft, while skin peeling had a faint taste of alcohol. The rising plaque gradually loses its water, and it shrinks and sinks, and even cracks. When peeled and watched, the subcutaneous layer was seen to be rotten and a brown area appeared on the surface of the xylem. The epidermis has been continuously expanding, with the fastest growing rate in the spring and autumn and vertical development faster than horizontal. In the depressed skin, dense small black papules appear, which is the conidium of the pathogen.
When rain or humidity is too high, the milky white paste is extruded from the top of the black spot and gradually turns orange, which is the spore angle of the pathogen. The spores are squeezed and dried to form slender tendrils. Conidiophore seats are sometimes arranged in concentric rings. After dry skin is easily peeled, visible cortex rot into messy fiber filaments. If the epidermis is dry for a week, the stems above it will dry up and form dry branches.
There were no obvious ulcer spots when the sprigs were on the pathogenesis. There were no obvious ulcer spots on the rough skin, and there were no tendril-like spores, but there were amber conidium blocks.
The law of incidence
The germs survived and survived in the diseased skin for consecutive years, and conidia were formed in April. The amount produced in May was the most. The conidia horns are more in the rain or in wet weather. After the spores are opened by rainwater, the spores are transmitted by wind, rain, insects, and birds, and they invade from the dead skin. In the northern region, the disease began in mid-March. May was the peak period of disease, in July, the disease eased, and development stopped in September.
Poplar rotten disease is positively correlated with frost damage, sun burns, insect pests, salt damage and drought. In terms of tree species, silver poplar and Populus euphratica are the most resistant to disease, and Populus simonii, Populus simonii, and Cymbidium subsp. Feeling sick.
Planting with large seedlings, root injury when transplanting, too many transplants, large seedlings or saplings that have been planted for too long, are not easy to restore vitality after transplantation, and are therefore susceptible to disease. In urban and rural tree-planting, poor pruning techniques, excessive trimming, and extensive mechanical damage are all conducive to disease. In shelter forests and patch forests, the windward side is often attacked by wind and sand, and it is also prone to disease. Because the density is too small or there are too many prunings, if the amount of light received is too large to cause daily burns, it is easy to develop.
Prevention
1. Maintaining vigorous growth of trees is the main way to prevent and cure this disease. When planting, choose suitable soil conditions, choose the species and varieties of antifreeze, insect resistance, anti-sunburn, and protect the root system. After planting, strengthen tending and management, prevent pests and stems from pupae. Reasonable pruning does not leave stubs and protect wounds. The trunk of the early winter should be painted white to prevent freezing and sunburn. After forestation, it is necessary to improve the health status of forests and remove weak branches and whole plants. Shelterbelts should be designed to create a semi-permeable structure and small shrubs should be planted on the windward side.
2. 10% alkaline water, 2% recovery agent 843 (1:3 times liquid), 10% double effect spirit (1:10 times liquid), pine tar diesel (1:1), 10% carbonic acid can be used for chemical control Sodium liquor, carbendazim (1:25 times), thiophanates (1:25 times), lime sulfur, but double effect (1:10 dilution) is the preferred agent. Because the use of the agent is effective, low cost, adequate drug source, easy to promote, no phytotoxicity, the use of dry and spray dry as well. The use of the above agents, in the 5 days after the application, such as in the lesion around 50 ~ 1ooppm gibberellin, can promote the formation of healing tissue, the lesion is not easy to relapse.
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A diagnostic test is a procedure performed to confirm or determine the presence of disease in an individual suspected of having a disease, usually following the report of symptoms, or based on other medical test results.[1][2] This includes posthumous diagnosis.
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