How to control common pests and diseases of Lagerstroemia indica

Symptoms: The disease mainly damages its leaves, and young leaves are more susceptible to infection. Small white dots will appear on the leaves, and then expand into round dots. In severe cases, the leaves will turn yellow, causing the leaves to fall off.

Prevention and control: It is necessary to strengthen fertilization and pay attention to drainage to prevent excessive humidity. Reduce the source of infection, eliminate dead branches and diseased branches when pruning in winter, spray triadimefon and zineb when the disease occurs, or use several drugs in turn.

crape myrtle

Second, brown spot disease

Symptoms: The disease also invades leaves, usually starting from the lower leaves and then gradually spreading upwards, resulting in many lesions. When the condition is serious, it will also cause the leaves to turn yellow quickly and fall off early.

Prevention and control: Pay attention to observation, remove diseased branches and leaves as soon as possible, and then focus on incineration, which can reduce the source of germs.

crape myrtle

Third, Wei Zirong Street.

Symptoms: Female adults and nymphs parasitize in bud axils, which will suck the juice of leaves and branches, leading to the blackening of branches and leaves, seriously affecting growth and development. Their excrement will also cause sooty blotch, which will lead to other pests.

Prevention and control: it is necessary to strengthen inspection, prevent the invasion of pathogens, rationally fertilize and ensure the improvement of disease resistance.