What are the cultivation points of Lagerstroemia indica?

Potted Lagerstroemia indica can be planted in round waist pots, long round pots or rectangular pots. Pot soil can be mixed with garden soil and river sand, and a small amount of gravel can be added appropriately. Lagerstroemia indica is most afraid of water, so a layer of broken tiles must be filled under the basin, and decomposed cake fertilizer or manure should be applied as the base fertilizer. When the seedlings are planted, they should be placed in the shade, and after survival, they should be placed in the direct sunlight.

Potted seedlings can be fixed at 40 ~ 50 cm to promote 5 ~ 7 main branches, and only 1 ~ 2 buds (3 ~ 5 cm) are left every spring to dwarf the tree. For larger stumps, the dead branches, weak branches in the inner cavity and branches of diseases and insect pests should be thinned to make the tree shape neat and beautiful.

The growing season must be placed in a sunny place. When new shoots grow, apply 1 ~ 2 times of nitrogen and phosphorus cake fertilizer. Apply 1% ~ 2% potassium dihydrogen phosphate at flowering. If no seeds are left after flowering, the inflorescence should be cut off in time, and it can be safely wintered in winter with a little protection.

Powdery mildew of Lagerstroemia indica mainly harms young leaves. Small white powder spots appeared at first, which expanded into round or irregular fading spots, covered with white powder and twisted yellow-green leaves. The pathogen overwinters in dormant buds with mycelium, which is infected by airflow. It started in April and peaked in autumn. After the attack, it can be controlled by 15% triadimefon wettable powder 1000 times.

Lagerstroemia indica brown spots are round or irregular purple-brown to brown spots at first. The edge of the spot is pale and the boundary is unclear. Black mildew spots were planted on both sides of the diseased leaves, and the leaves turned yellow and fell off. The pathogen overwinters in diseased leaves or soil, and the lower canopy disease is serious and gradually spreads upward. The disease started in July, peaked in September, and became serious in rainy autumn. After the onset, it can be prevented and treated with 50% carbendazim 6000 times solution.