How to control stem rot of Euonymus tomentosa
Rot is a major disease of Populus tomentosa, which can cause the whole plant to die in serious cases. Under the influence of the special climate in winter and spring, the turning green of Euonymus tomentosa is not ideal, and some dead branches will appear, resulting in the weakening of the growth potential of Populus tomentosa, thus reducing the disease resistance of the plant. Some Euonymus tomentosa are prone to stem rot. In particular, the branches in 2012 suffered the most seriously, the stem turned brown at the initial stage, the leaves lost green, the shoots drooped, the leaves did not fall off, and in the later stage, the damaged parts of the stem blackened, the cortex shrunk, the endothelial tissue rotted, and there were many small black sclerotiors. at the same time, the damaged parts developed rapidly, and the bacteria invaded the xylem, resulting in the death of the whole plant.
The main results are as follows: 1. the pathogen of stem rot of Euonymus tomentosa is a semi-known fungus, which usually lives saprophytic life in the soil. When the temperature rises in summer, the soil temperature also increases, and the pathogen invades the stem of the seedling. Especially in high temperature and low-lying areas, the disease is more common.
II. Prevention and control measures
1. Strengthen the maintenance and management of seedlings to improve their own disease resistance.
two。 The use of fully mature farm manure as base fertilizer can reduce the incidence of seedlings.
3. Summer seedlings take cooling measures such as building shade sheds, and large seedlings can use planting ground cover plants or ground covered with grass to destroy the environmental conditions for the occurrence of pathogens.
4. Cut off the diseased branches in time and burn them centrally.
5. When the number of diseased seedlings is small, you can use a brush to apply 50% carbendazim solution or 50 times 25% enemy demulsified oil (propanazolin) on the stem at the initial stage of the disease. When the amount of seedlings is large or the disease is at its peak, the seedlings are generally sprayed with 8-1000 times liquid of must shark and 2000-2500 times liquid of Penicillium. Both methods are performed once every 7 days for 2 to 3 times in a row, which can play a role in prevention and treatment.
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How to control leaf spot of Euonymus tomentosa
Euonymus tomentosa is a small evergreen shrub commonly used in gardens, which has many advantages, but the occurrence of leaf spot will cause early defoliation, bald branches and even death, which seriously affect the normal growth and ornamental effect of Euonymus tomentosa. Symptoms: in the early stage of the disease, there are small yellow spots on the leaves, which gradually become yellowish brown and enlarge into round or irregular spots with a diameter of 2 mm to 10 mm. In the later stage, the lesions are grayish brown or grayish white, with dark edges, and there are many small black spots on the disease spots. In severe cases, the disease spots are linked together.
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Maintenance of Populus tomentosa bonsai
Adequate sunshine and moisture for the placement of boxwood bonsai, it is best to choose a place where "the sun can be basked in in the morning, the afternoon is cooler, the air is well ventilated, and the rain and dew depend on nature". If you watch it indoors, you'd better let it go to the sun and rain again after ten and a half days. The basin of Populus tomentosa bonsai should always be kept moist, because its root absorption, leaf photosynthesis and the whole growth process require a lot of water, and of course the demand also varies with the seasonal climate. From the edge of the river and stream to the small basin in the garden.
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