Lagerstroemia speciosa

This is a kind of pest called a scale insect.

Solution:

1, alcohol: use a brush or cotton swab to dip in alcohol and wipe the infected part. If the leaves are dense and difficult to wipe, you can use alcohol to wet the seriously damaged part. Generally speaking, the insects that can get wet will die, and it can be cleaned after several times.

2. Water flushing: spray the scale insects away with a watering can or an adjustable nozzle. Of course, although this method can't cure the disease, it can effectively control pests.

3. Spraying: If the pests are serious and need to use drugs, you can try to use drugs such as Zhibizhi, methylphosphine, abamectin and chlorpyrifos. Pay attention to control the concentration when using.

Extended data:

Harm of scale insects

Scale insects mainly harm plants, and female adults can hatch mobile insects without waxy scales a few days after laying eggs. Larvae crawls on ornamental plants. After finding a suitable place, they pierce their mouthparts into flowers and trees, suck the juice, and start a fixed life, which makes the host plants lose nutrition and lose a lot of water.

Poor growth often leads to buds and buds turning yellow and wilting after being damaged. While harming ornamental plants, some of them also emit a lot of honey dew, which leads to bituminous coal disease, which makes the leaves unable to carry out photosynthesis, and the severely damaged plants decline and finally the whole plant dies.

References:

Scale insect-Baidu encyclopedia