What is the reason for the trunk cracking of Lagerstroemia indica?

Brown spot disease is also a common disease of garden plants, which often occurs in the growing season of Lagerstroemia indica. The occurrence of brown spot disease often leads to a large number of dead leaves and fallen leaves of plants. Affect viewing and flowering.

Symptoms-The pathogen of Lagerstroemia indica brown spot is also fungi, which mainly attacks the leaves, usually the lower leaves begin to get sick, and then gradually spread to the upper parts. At the beginning of the disease, the lesions were round or nearly round, with different sizes and a few irregular shapes. The focus is purple-black to black with light edge color. Then the color of the lesion deepened, showing black or dark black, and the boundary with the healthy part was obvious. In the later stage, the color of the lesion center becomes pale and small gray-black mildew spots appear. When the condition is serious, the diseased spots become one piece, the whole leaves turn yellow quickly and fall off early.

Occurrence regularity-Lagerstroemia indica brown spot is caused by the infection of Cercospora rutaecarpa. The pathogen overwinters on the diseased body in the form of mycelium or conidia, and carries out primary infection and reinfection through conidia in the next year, and spreads through airflow or wind and rain. Brown spot disease in Tianshui area generally begins in early summer and is seriously harmful in autumn. It is easy to break out in hot and rainy seasons, especially in years or seasons with frequent rainstorms; Generally speaking, the lower leaves are more susceptible to infection than the upper leaves.

Glycyrrhiza uralensis Fisch, alias Lagerstroemia microphylla, Lagerstroemia tenuifolia, Melaleuca, Full House Red and Milky Crystal. It is a dicotyledonous plant of Lagerstroemia of Lysimachiaceae. Of southern Asia and northern Australia. It is distributed in East China, Central China, South China and Southwest China, and widely cultivated in various places. Lagerstroemia indica has beautiful posture, smooth trunk and bright colors; It happens to be summer and autumn when flowers bloom, and the flowering period is particularly long, from June to September. Therefore, it is known as "Hundred Days Red" and "Summer Blue and White Flowers Full". It is a good bonsai for ornamental flowers, stems and roots. Wei Zi is also the city flower of Jincheng.