MySheen

Black locust mosaic disease

Published: 2024-11-24 Author: mysheen
Last Updated: 2024/11/24, [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

[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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