Chestnut is rich in nutrients, and the fruit is rich in sugar and starch. It has the functions of invigorating the kidney and strengthening the spleen, strengthening the body and strengthening the stomach. Known as the "fruit of the kidney." However, during the chestnut planting process, chestnut blight has caused serious damage to chestnut production. Therefore, today Xiaobian talks about the symptoms and comprehensive prevention measures of chestnut blight.
1 Chestnut blight pathogens and symptoms
The pathogen of chestnut blight is ascomycetes of the genus Ascomycetes of the genus Ascomycetes, which is a genus of the genus Chlamydomonas, which is caused by the stems or the whole tree.
2 characteristics of the disease and the causes of the epidemic
2.1 Characteristics of the disease
The severe period of damage is that the temperature in early spring rises to the germination stage of chestnut trees; the incidence rate and death rate of young trees are higher in the current year.
2.2 Causes of prevalence
High-resistance varieties were not selected; seedlings and scions were not quarantined, and the interface was not disinfected; planting density was high, soil fertility was low; and pests and diseases were severely affected, resulting in reduced tree resistance.
3 Comprehensive prevention
3.1 Selection of resistant varieties
The high resistance varieties of Chinese chestnut blight mainly include red chestnut, Shifeng, Wuchaoli, oil chestnut, yellow chestnut, gray chestnut, Guilin oil chestnut, oil chestnut, Mingli, Chang'an chestnut and nine species.
3.2 Using virus-free seedlings
Non-toxic rootstocks and non-toxic scions are used to cultivate robust, disease-free and pest-free seedlings. When grafting, it is forbidden to graft other varieties with scion.
3.3 Biological control
3.3.1 Antibiotic effect: using fermented cake fertilizer as fertilizer can enhance tree potential, improve disease resistance, and reduce stem rot caused by Coccidioides sinensis.
3.3.2 Heavy parasitic effect: There is a kind of fungus called “Lubao No. 1†in China, which can be parasitic on the dodder of the chestnut, which causes the disease to die.
3.4 Chemical control
It mainly includes stone sulphur mixture protection in the whole garden. It is disinfected by applying “402†bactericide on the trunk and rhizosphere, and is controlled by Fumex arsenic leaf spray.
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