What are the harmful characteristics of Robinia pseudoacacia mosaic disease? What is its pathogen?
Robinia pseudoacacia mosaic is a common disease of Robinia pseudoacacia. The disease began from April to May in spring. The symptoms are systemic mosaic. The color of the leaves is uneven, some appear light green, dark green mottled, and show bubble spots. Some leaves are deformed; the shape of the leaf becomes narrower and longer, and in severe cases it is linear. Some leaf axil adventitious buds germinate and produce thin branchlets with very short internodes, the leaves are narrow, and the axillary buds of branchlets germinate and draw out branchlets again, so that they germinate and grow step by step, forming a clump of branches and leaves. Affect the normal growth of the tree, after the young tree is damaged, gradually form a "small old tree" shape.
The typical diseased leaves of Robinia pseudoacacia mosaic were collected and observed by extraction, differential centrifugation and electron microscope. The pathogen of Robinia pseudoacacia mosaic disease was a virus disease caused by spherical virus. At present, there is no effective prevention and control method. However, when breeding seedlings, do not collect breeding materials from diseased plants; if germs are found, they should be pulled out and destroyed in time to prevent the spread of diseases.
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What is the incidence law of rotting skin disease of Robinia pseudoacacia? How to prevent and cure?
Rotting skin disease of Robinia pseudoacacia is the main branch disease of Robinia pseudoacacia, and both young and adult trees can be killed. Most of the diseases occurred in the trunk cortex of Robinia pseudoacacia. After the damage to the trees, most of the disease spots of different sizes appear in the lower part of the trunk and branches, and the disease spots are fusiform, oval or irregular. The diseased part of the trunk of the young tree was ulcerated and slightly sunken; the cortex of the trunk of the tree was thick, and the waterlogged and sunken part of the disease was not obvious. The expansion rate of the disease is longitudinally greater than that of horizontal. When the disease department surrounded the trunk for a week, the tree withered and died. Lenticels and bark cracks in the later stage of the disease
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Black locust mosaic disease
[distribution and harm] it is quite common in Beijing and Shandong. Affect the growth of young trees, resulting in dwarfism. [symptoms] the leaf surface shows irregular line patches, the distribution is not located, and the pattern is beautiful. Some leaves become smaller and the leaf color becomes lighter. If you do not observe carefully, it is easy to be neglected. When the leaf axil adventitious buds germinate, the weak branches and branchlets are clustered. Occurs in Eastern Europe, Central Europe or the United States, the leaf becomes smaller, the vein is bright, the petiole is short, the plant is vulnerable to freezing injury, and often have many branches, yellowing phenomenon. British mosaic with mottled leaves and twisted leaves and bent wood
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