Introduction to the symptoms and control methods of Fusarium wilt of albizzia acacia

Albizia tree, also known as cashmere tree, Lantana, is a summer flowering plant, its flower color is mostly pink, the shape is more strange, like a feather fan. The wood of the acacia tree is very four-core used to make furniture, sleepers and so on, because its structure is relatively fine, the texture is very straight, and the color is reddish brown. Albizia mandshurica is planted in many parts of our country, and Fusarium wilt is easy to occur in the process of planting, so what are the symptoms and control methods of the disease?

Symptoms of Fusarium wilt of albizzia julibrissin

The symptoms of Fusarium wilt of albizzia trees mostly appear in the rainy season, and the leaves on the diseased branches wilt, droop, dry and atrophy; sometimes the diseased leaves are still green or yellow, so that the leaves fall off, and generally turn yellow from the leaves at the base of the branches. It often shows the above symptoms on one or two branches and gradually extends to other branches. Cross-cut the diseased branches and stems, and the sapwood has brown ring spots; if the branches and stems are cut longitudinally, there are brown longitudinal stripes in the duct part of the sapwood. In late summer and early autumn, the symptoms of invasion of diseased branches or branches and trunk wounds were mostly spread up and down to the wound, sunken spot, bacterial conidia and a large number of pink powder conidia; the symptoms of bacterial invasion from branch and stem wound were mostly spread up and down to the wound, the disease spot was sunken, the germ conidia pile broke through the skin seam, and there were piles of pink conidia, and the bark swelled and rotted.

The disease is mainly a systematic infection disease. Germs spend the winter on diseased plants or in the soil with diseased remains. In the following spring and summer, when the humidity and temperature were suitable, the pathogen could invade from the root wound or directly, and spread to the ducts of the cadres and branches along the ducts, poisoning and blocking the ducts, cutting off the transport of water, and causing the branches to wither. There are many trees planted in Rain Water's low-lying land and suffer seriously.

2. Control methods of Fusarium wilt of albizzia julibrissin

The infection period of the disease is long, there are many ways of transmission, a wide range of pathogens, systematic infection, and the initial stage of infection is difficult to detect, once the appearance of the disease, it is difficult to control this characteristic. It is difficult to achieve the purpose of control by taking individual control measures, and comprehensive control is necessary in order to achieve the best control effect.

Choose suitable soil for planting. Albizia tree planting must avoid low-lying land, to choose loose soil, better drainage conditions for planting.

Planting should be scientific in form. It is best to cultivate a single plant or several trees in the green belt, but also dotted in the garden and courtyard; because the street soil is solid and the drainage is poor, it is not suitable to be a street tree.

Improve the level of management. After planting, albizzia trees should adhere to regular soil loosening, drought prevention and drainage, regular fertilization, so as to apply organic fertilizer once in spring and autumn. Adult trees should be applied organic fertilizer, each tree 4 to 6 kg organic fertilizer mixed soil evenly pit application, in order to enhance the disease resistance of albizzia trees.

Chemical control. First, in summer, before the disease is seen, 50% methyl thiophanate 500 times or 40% carbendazim 600 times is irrigated one by one. Second, the transplanted tree can be treated with 10% copper sulfate solution dipped in the root. For the truncated branch section, apply protective agent to prevent the invasion of bacteria.