Yellow leaves of Lagerstroemia speciosa, control

Reason: Metabolism is the most common phenomenon in plant growth, and yellowing of leaves is one of the typical manifestations of plant metabolism. Because there will always be some leaves that start to turn yellow and then fall off because of nutrient exhaustion, which is normal. Measures: If it is natural aging, don't worry too much. You just need to trim the yellow leaves in time and then continue the normal maintenance.

Overwatering

Reason: Lagerstroemia indica is drought-resistant and has strong drought resistance. Too much watering will form stagnant water, so that you can't absorb nutrients from the soil from the roots, and you can't complete the normal nutrient transfer, which will eventually lead to yellowing of the leaves. Measures: Too much watering is easy to rot the roots. You need to cut off the rotten parts and replant them in flowerpots. Watering crape myrtle should adhere to the principle of "don't do it, don't water it", and water it thoroughly to ensure no water accumulation. Pay attention to drainage in rainy season every year to avoid root rot.

3. Powdery mildew

Reason: There are many common diseases in plant growth, powdery mildew is one of them, and Lagerstroemia indica is more susceptible to powdery mildew. The invasion of powdery mildew will make the leaves of Lagerstroemia indica wither and turn yellow, and then gradually fall off, which will affect the growth of plants and hinder appreciation. Measures: to solve the disease problem, we should do a good job of maintenance and prevention at ordinary times. We can spray 500 times of 80% zineb wettable powder and 800 times of 50% carbendazim wettable powder.