The results and discussion of leaf diseases of Holly Euonymus

Through continuous 2 a systematic investigations, it was found that the disease of Holly lanceolata leaves is becoming more and more serious and widely distributed. In the management of aging plants with extensive tree vigor, the disease is particularly serious, causing a large number of leaves to fall prematurely, the entire branches and even the entire plant dying, which seriously affects the growth of the plant and reduces the greening and ornamental effects. A total of 6 species of leaf diseases were investigated. Among them, 2 species of leaf diseases were only scattered, and the remaining 4 diseases occurred at each survey site and were serious, hindering The growth and development of Euonymus japonicus leads to a decrease in ornamental value and causes a certain economic loss. It is the main disease of the leaves.
Idiopathic disease pathogens overwinter in diseased leaves mainly with mycelium or conidia. In the following year 5 month, the pathogen spores begin to germinate and infect, and the onset time is earlier than type Ⅱ, Ⅲ, and Ⅳ diseases The lesions are small, and it is easy to cause the diseased leaves to yellow and fall off. Therefore, the protection time should be advanced, and it is appropriate to protect at the end of 5. Type Ⅱ disease pathogens mainly overwinter in the diseased leaves with hyphae or subsegments, and the disease begins in the middle and late months of 7 in Anqing, and the peak period of disease is from 8 from late month to 9 , The incidence can reach more than 9 O.
Type Ⅲ diseases often occur together with type Ⅱ diseases. One leaf often has 2 different types of disease spots. When the humidity is high, a pile of sticky pink spores can be seen. This disease occurs a little later than the type Ⅱ disease. Type Ⅳ disease pathogens can only invade from the wound, mainly harming the leaves and petioles, densely condensed small black spots on the diseased leaves. Isolate and purify the pathogenic bacteria of the disease, and found in the pathogenicity test that the pathogenic bacteria are innocuously inoculated, the needles 1 needles and needles 1 inoculate the leaves, the difference is large, indicating the disease The degree of occurrence is related to the size of the wound.
Holly euonymus needs regular pruning to maintain a specific shape. The wound caused by pruning leaves benefits from the invasion of the pathogen, and the pathogen is easy to separate and culture. The requirements for nutrition, temperature and humidity are not strict, and the adaptability is strong. Occurrence and fashion trends are great.
The disease of Euonymus japonicus in our country is relatively common, and it occurs from south to north, indicating that the climate and site environment in the north and south of China are suitable for the occurrence of diseases. High temperature and humidity are the main factors that are prone to disease. The investigation shows that the main diseases of euonymus 4 have a great threat to the healthy growth of holly euonymus, and should be paid attention to to reduce unnecessary economic losses. At present, the research group has obtained the pathogens of these 4 major diseases. The next step will be to study the biological characteristics, pathogenic mechanism and comprehensive protection of these pathogens for the screening of new drugs, excellent The breeding of resistant varieties laid the foundation.