Control techniques and methods of Lagerstroemia indica pests and diseases

When planting Lagerstroemia indica, it is necessary to strengthen topdressing, do a good job in water management, prevent excessive water in the field, increase the humidity in the field, do a good job in clearing the garden in autumn and winter, clean up litter and burn it centrally. After the disease occurs, spraying triadimefon, thiophanate-methyl and other chemicals properly to prevent and control it, avoiding the use of a single drug, and it is best to use several drugs in turn. Pests can be controlled by aphids and lice nets.

Common diseases in Lagerstroemia indica cultivation

1, Powdery Mildew: Powdery Mildew affects the growth of leaves, and the incidence of young leaves is high, which may also harm the growth of branches and flowers. In the early stage of the disease, white spots will appear on the diseased leaves, and then become patches, and the quality of flowers will decline, and the ornamental value will be seriously insufficient. When the disease is serious, it will lead to plant death.

2. Brown spot disease: Brown spot disease is a common disease, which often occurs during the growth of Lagerstroemia indica. It will cause a large number of leaves to wither and fall off, affecting ornamental and flowering.

3. sooty blotch: sooty blotch is harmful to the growth of leaves and branches. After illness, small black spots will appear in the affected area. Like powdery mildew, spots will gradually expand and merge. Finally, a thin layer of black objects will appear on the leaves, which will hinder the photosynthesis of the leaves, affect the accumulation of photosynthetic substances, and hinder the yellowing, defoliation and flower bud differentiation of the leaves.

Main pests of cultivated Lagerstroemia indica

Harm of spotted aphid: The spotted aphid is seriously harmful in May and June, and the aphid will suck juice, which will harm young leaves and seriously threaten the growth of Lagerstroemia indica.

Arbuscular pests: Arbuscular larvae mainly hide in the axils of Lagerstroemia indica flower buds and suck nutrients from leaves and branches, which leads to the blackening of their branches and leaves, which is not good for the growth of Lagerstroemia indica. In addition, the excrement of this pest can also induce sooty blotch, which is quite harmful.

Control of Lagerstroemia indica pests and diseases

1, powdery mildew: When planting, it is necessary to strengthen topdressing, do a good job of water management, prevent excessive water in the field, increase the humidity in the field, do a good job of clearing the garden in autumn and winter, clean up the dead leaves, burn them centrally, and spray triadimefon and other drugs appropriately after the disease occurs to prevent and control it, so as to avoid single use, and it is best to use several drugs alternately.

2. sooty blotch: Strengthen management, control planting density when planting, trim diseased branches and redundant branches in time, improve air permeability, enhance tree vigor, fundamentally reduce the incidence rate, remove diseased leaves in time after illness, use thiophanate-methyl and other drugs to prevent aphids and prevent bacterial infection.

3. Aphids and long-horned aphids: In winter, we must do a good job in clearing the garden, cut off branches of pests and diseases, properly trim them, and take them out of the field for burning, destroying the wintering place of eggs. Then be sure to remove the cracked cortex from the branches to prevent the eggs from wintering. After the outbreak of pests, pesticides such as aphididine should be used to prevent the spread of diseases.