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. The diseased seedlings are only half as small as the healthy ones. The hosts are Robinia pseudoacacia (Robiniapseudoacaci) and Robinia pseudoacacia (R.viscosa), with an incidence of about 10%.
[pathogen] the virion of foreign locust mosaic virus (RoMV) was first isolated in Hungary in 1961. Later, it was also recorded in Yugoslavia and was considered to be cucumber mosaic virus CMV. The reported virion size is 40nm. When purified by a special method, the particles are round and 27~28nm in diameter. It can be transmitted by aphids.
In 1981, it was reported that the diameter of virion was 34nm. When inoculated with Chenopodium amaranth, the seedling leaves appeared round and chlorotic halo spots, while in cowpea seedlings, they showed systematic mosaic. The virus passivation temperature was 66-68 ℃, the in vitro survival time was 57 days, and the dilution end point was 10-4-10-5.
The virus can be inoculated mechanically. The soil does not transmit poison. Insects are mediators. Aphids (Aphiscraccivora) and peach aphids (Myzuspersicae) can carry virus non-persistently.
The host range of this virus is very wide, more than 10 families. The symptoms of natural infection in angiosperms are systemic mosaic and leaf distortion. Chenopodium amaranth, fennel, bean, tomato and so on can be used as diagnostic hosts. Breeding hosts include heart leaf tobacco and common tobacco.
[control measures] eliminating aphids can reduce the incidence of aphids.
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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, one by one
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What are the characteristics of Robinia pseudoacacia valley moth? What is the method of prevention and control?
Robinia pseudoacacia valley moth is commonly known as Robinia pseudoacacia. It mainly harms Robinia pseudoacacia. When the larvae eat the trunk cortex, the tissue in the affected part is proliferated and expanded, the bark is warped and cracked, the skin is filled with rotten tissue, and the skin is sewn with insect dung, which can lead to the weakness of the tree and even the death of the whole plant. Adult, female moth 7 mm 10 mm long, wingspan 17 mm 22 mm, male moth slightly smaller; gray-white or black-brown body, gray-white chest and wing base; gray-white forewings mixed with grayish brown or dark-brown scales, wing base with erect dark-brown scale clusters, wing surface 2 horizontal scale clusters
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