Control Techniques of Powdery Mildew of Euonymus Japonica
Powdery mildew is common, which affects its ornamental and restricts its application in landscaping.
Symptoms: powdery mildew mainly harms the leaves of Euonymus tomentosa, and the disease spots are mostly distributed on the leaf surface, resulting in powdery mildew spots. When the disease is serious, leaf back and new shoots can also occur, resulting in leaf shrinkage and deformity, twisted new shoots, atrophy and stop growing, and lead to fallen leaves and withered shoots. In the early stage of the disease, there are many small white round spots scattered on the leaves, and with the gradual expansion of the disease spots, irregular large spots are formed, and even occupy the whole leaf surface. If the white powder layer on the surface of the disease spot is erased, yellow round spots can be found in the affected area.
Occurrence regularity: the pathogen overwintered in the damaged tissue or bud scale of Euonymus tomentosa with mycelium (i.e. gray membrane bacterial layer). In the spring of the following year, a large number of conidia were produced in the leaf expansion and growing period of Euonymus tomentosa, which was transmitted and infected by airflow, which became the bacterial source of the first infection of the disease. The pathogen parasitized on the surface of the branches and leaves of the host, produced haustorium deep into the epidermal cells to absorb nutrients, and produced a large number of spores to infect leaves and shoots many times in spring, summer and autumn every year. High temperature in summer is the main factor for the occurrence of diseases.
Prevention and control measures:
1. In order to improve the cultivation conditions, we should choose the land with high terrain, dry, sufficient light, no stagnant water and deep and fertile soil.
two。 Strengthen fertilizer and water management, increase the application of phosphorus and potassium fertilizer, appropriate amount of nitrogen fertilizer, pay attention to drought and drainage, make seedlings grow strong and improve disease resistance.
3. Reasonable pruning, cutting off diseased branches and leaves. Do a good job of clearing the garden in winter, sweep the diseased branches and leaves and burn them in a concentrated way, and the diseased branches found in the growing period can be cut off and burned in time, which can effectively reduce the source of primary infection and reinfection of the disease.
4. Rational use of pesticides for timely prevention and control, pay attention to the alternate use of agents, so as to prevent powdery mildew from producing drug resistance. Spray should be uniform, pay attention to spraying the inner chamber and leaf back. The mixture of stone and sulfur was used twice in winter, with an interval of one month. During the leaf development and growth period of Euonymus tomentosa, especially from April to May and September to October, the following medicaments can be used for control: 8-1000-fold liquid of Bietobacter shark, 2000-3000-fold liquid of Penicillium, 80-1000-fold liquid of 25% trimethoprim, 800-fold liquid of 70% methyl topiramate, 1000-1500-fold liquid of 50% benzoate, 50% acetaminophen 800-fold liquid and so on.
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Control and identification of white silk disease of Populus tomentosa
The occurrence of white silk disease of Populus tomentosa is caused by fungi, which is destructive and spreads rapidly. if it is not controlled, it may lead to the death of all seedlings. According to the previous work, we summarized the characteristics and control methods of white silk disease of Euonymus tomentosa. Symptoms: at the beginning of the disease, the stem or leaf base turned brown and rotted near the soil, and after several days of sunlight exposure, white silk-like mycelium appeared on the disease part and soil surface, which spread radially in the rhizosphere soil, and brown grew on the near-surface stem in the later stage. Rapeseed sclerotia often causes death of the whole plant.
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What is the symptom of big leaf yellow poplar powdery mildew?
Symptoms of powdery mildew of Euonymus tomentosa: the powdery mildew is mostly distributed on the front of the leaves, and some grow on the back of the leaves. A single lesion is round and white, and it is irregular after enlargement and healing. The primary disease showed yellow round spots when the superficial white powdery hyphae and spore layer were wiped off. In severe cases, the disease of new shoots can reach 100%. Sometimes the diseased leaves are shrunk and the diseased tips are twisted and atrophied.
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