Causes and Control Methods of Euonymus japonicus Wilt Disease

Euonymus japonicus wilt disease is a common disease of Euonymus japonicus in recent years. It is characterized by sudden onset, rapid spread, and a major impact on landscaping effects. Although this disease is stubborn, if correct measures are taken, targeting the pathogen and applying multiple measures at once, satisfactory control results can still be achieved.

Symptoms

In affected Euonymus japonicus, at first only the upper leaves of individual branches turn green-dry and lose water, then the entire branch and the whole plant's leaves and branches show a green-wilted, water-loss appearance. In the late stage of the disease, the leaves turn yellowish-white, and severe infection can lead to plant death.

Occurrence Pattern

The pathogen is Fusarium present in the soil. The pathogen mostly invades through root wounds, but can also directly invade the plant. It generally begins to occur in mid-May, with the peak incidence in July and August. Some plants take no more than a week from onset to death.

Control Methods

1. Strengthen epidemic inspections and strictly prevent diseased plants from entering non-epidemic areas; 2. Strengthen water and fertilizer management to improve plant disease resistance. The cultivation site should remain moist, but not waterlogged; 3. If diseased plants are found, the diseased plants should be removed and burned promptly. The cultivation site can be irrigated and disinfected with a 600-fold dilution of 75% chlorothalonil wettable powder at 5 to 6 kg per sq m, irrigating three times consecutively with an interval of 5 days each time; sulfur powder 0.5 kg can also be thoroughly mixed with the soil for disinfection; 4. For unaffected plants, alternate spraying with a 500-fold dilution of 50% carbendazim or a 1000-fold dilution of 65% zineb can be used for control, spraying 2 to 3 times consecutively.