Pear ring disease is distributed throughout the country's pear production areas. The pathogen invades the branches and leaves of the fruit. On the fruit, the disease usually occurs in the near mature period, and the disease quickly rots. The latently infected fruits are rotted during the storage period, and the cattle can seriously cause rotten warehouses, resulting in huge economic losses, and their occurrence and damage are increasing year by year.
Symptoms? In the branches. The dark brown lesions are usually formed with the lenticene as the center. The lesions are round and have a diameter of about 5-15 mm. The initial lesions are slightly raised. The lower edge is subsiding and split from the diseased and healthy borders.
Frequently, multiple lesions are connected together to form irregular large spots, and many black dots are formed in the spring lesions as pathogen conidiospores. On the fruit, it usually occurs in the near-mature period. The first manifestation is the pelthole as the center, water-stained brown round spots, and later lesions gradually expand into dark brown and show concentric ring patterns. The disease quickly rots.
The fruit rotting caused by ringworm, anthrax, dry rot and rot is very similar in symptoms, and differences should be noted. The symptoms of pear ringworm disease on the branches are very subtle. Except for a few pear varieties, limb symptoms are rarely seen on Yali pear and Snowflake Pear. But rotten fruit is very common. The irregular brown lesions appear on the leaves and then gradually turn grayish from the center. When there are multiple lesions on the leaves, the leaves may dry out and fall off.
Disease characteristics: Mycelium and conidia in the stem lesions are the main source of infection. Overwintering conidia, the formation and release of conidia from the end of February in the spring of the following year. Branched sacrows spread through the rain and cause the infestation of branches, fruits and leaves. Branches do not form gowns on lesions formed in the same year, and the most important period for the formation of gowns is from 2 to 3 years from the second year of lesion formation. Pear rotenosis has the characteristics of latent infestation on branches and fruits, especially in fruit, many of them are early infestations, the onset of maturation, and the length of the incubation period is mainly affected by the development of fruit and temperature. The general management of trees with weakly growing thick trees has been seriously affected. Among the cultivars that did not ask questions, the occurrence of sand pear lines and pears and white pears in the pear family were serious, and the varieties of pears and Qiuzi pears were resistant to Bo. ??
Control methods can refer to Apple round Bo?

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