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Myrica rubra rot and its control
Branch sprue of Myrica rubra is a common disease of old bayberry trees. In the past, the poplar trees in our city were rare. In recent years, due to changes in the climate and ecological environment, they have occurred one after another and caused damage. For example, the 9-year-old Yangmei trees in the Taiyuan Tsai Ridge Orchard in Taiyuan, Sanyuan District, is extensively managed. The occurrence of branch rot is heavier, causing the branches to rot and die, causing premature aging of the trees. To this end, the author combines observations of the main symptoms of the disease in recent years, put forward prevention and treatment advice for production reference. 1. Infestation symptoms Bayberry rot is a disease caused by fungi. The bacteria invaded from the branch wounds, cracks, or nodes between the shoots and the base shoots, and began to develop from here, gradually spread throughout the branches, until the 2 to 3 year old shoots were withered. Branch lesions were reddish-brown at the beginning, slightly bulging, and the cortex tissues were soft, and they sag with their fingers. Later on the diseased branches, there were many dense small black spots, ie, pathogenic sub-spots. When the rain is wet, the spots on the dry branches absorb water, conidiospores overflow from the orifices, and are re-infected by the spread of wind and rain. 2. Treatment methods 2.1 Tree vigor enhancement Deep-turning soil improvement, application of organic and potassium fertilizers; attention to the appropriate combination of nitrogen, phosphorus, and potassium and application of trace fertilizers; scientific pruning, improvement of tree permeability, etc., to promote strong tree vigor Reduce the occurrence of diseases. 2.2 Removal of diseased trees In time, diseased shoots were cut off and diseased branches, diseased leaves, and dead trees were collectively burned to reduce the source of pathogenic bacteria infection. 2.3 Chemical control: In order to prevent the onset of new shoots, spray the fungicide 2 to 3 times every 7 to 10 days before the fruit ripening in the early period of spring shoots until the first half of June, with 70% thiophanate-methyl WP 800 ~ 1000 times liquid, 50% carbendazim WP 500 to 800 times liquid or 65% mancozeb WP wettable powder 600 ~ 800 times alternating use. In addition, the above-mentioned pesticides should be sprayed on the canopy after cutting off diseased and diseased leaves. If branches are severely exposed due to incomplete canopy, branches should be painted white to prevent sunburn.