How to prevent black spot of Prunus triloba

Black spot disease of Prunus triloba is a common disease of Prunus triloba and it is also a frequent disease in autumn. This disease not only affects the viewing, but also affects the growth of the plants. When the disease is severe, it causes the leaves to fall off prematurely, so it should be strengthened.

Symptoms

The lesions are nearly circular or irregular at the time of onset. As the disease progresses, multiple lesions can connect to each other to form large plaques. The lesions were light reddish-brown, with dark brown molds in the middle and late stages, and mildew more prominent at high temperatures and high humidity.

The law of incidence

The pathogenic bacteria is a fungus fungus, Alternaria sp. The pathogenic bacteria live over the winter in the diseased body, deciduous leaf, and bud scale. The second year of spring produces conidia, which is transmitted through air flow, watering, and rainfall. It can be repeatedly infested in the growing season, and it is the peak of high temperature and high temperature during the summer and early autumn. period.

Control methods

Strengthen the cultivation and management First, we must strengthen water and fertilizer management, cultivated land not to collect water, fertilization should pay attention to nutritional balance, can not be partial nitrogen fertilizer, organic fertilizer and inorganic fertilizer should be used with reasonable; second, timely pruning, so that the plant is always kept in the air State.

In the fall or early winter, the leaves should be cleared in time and burned or buried deeply.

In the early spring, it can be sprayed once with Baumedu Lithosulfur, and it should be sprayed and controlled in the early stage of disease. It can be used 80% Zeoxin Zinc wettable particles 800 times, 75% chlorothalonil wettable particles 800 times or 70% Dyson Manganese zinc wet particles 600 times, continuous spray 3 to 4 times, each time interval 7 to 10 days, can effectively control the condition.

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