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.