Rich tree leaves have brown spots, pay attention to distinguish leaf blight from leaf spot.

Brown spots appear in the leaves of the rich tree, which will not only affect the appearance of the rich tree, but also very likely affect the growth of the rich tree. However, brown spots alone may not be able to accurately judge what is wrong with the rich tree. This paper intends to introduce the brown spot on the leaves of the rich tree, and briefly introduces the two diseases of the rich tree and their control methods.

Leaf blight and leaf spot are common diseases of rich trees.

1. Leaf blight

Disease symptoms

The initial production of dark brown, the internal production of gray or dark brown symptoms like sunburn spots, long-term lesions can be seen on the black powder.

Prevention and cure method

1. Diseased leaves should be removed and destroyed in time.

2, strengthen maintenance and management, timely watering, fertilization, each growing season can be topdressing 2 to 3 times foliar fertilizer, such as 0.5% potassium dihydrogen phosphate or double-effect micro-fertilizer 200 times.

3. Prevention. When rich trees are cultivated in the southern region, timely prevention should be carried out from the rainy season, spraying 50% carbendazim 800x solution, or 70% chlorothalonil 800x solution, 75% methyl thiophanate 1500 times solution every 10-15 days.

4. At the initial stage of the disease, spray control with 75% chlorothalonil wettable powder, or 50% carbendazim wettable powder, or 1500 times methyl thiophanate wettable powder.

2. Leaf spot

Disease symptoms

The disease causes leaf scorch and is an important leaf disease. The disease affects growth and appreciation. In the early stage of the disease, small brown spots appeared on the leaf edge or leaf tip, and after expansion, the disease spot was irregular and dark brown; in the later stage of the disease, the spot was gray or grayish brown, the edge was dark brown lines, and there were or no yellow lesions around the spot. The major disease spot is in the shape of paper. Under wet conditions, the disease produces a small number of small black spots.

Treatment method

At the initial stage of the disease, the new high-fat membrane was sprayed with 65% Acetobacter wettable powder or 50% methyl thiophanate, 800 times sulfur suspension, 30% copper sulfate suspension 400 times, 75% Dakening wettable powder 700 times, and so on. Once every 10 days.

Whether it is leaf blight or leaf spot, brown spots will appear on the leaves. Therefore, the rich tree leaves have brown spots, before prevention and control, we need to distinguish between different diseases in order to prescribe the right medicine to cure the disease.