Lagerstroemia indica
Lagerstroemia indica pest control:
Ziweirong:
This common pest occurs in 2 generations in 1 year, and the eggs or nymphs overwinter. Female adult nymphs and nymphs suck on the buds, leaves and branches, causing the branches to blacken and the leaves to fall off, which seriously affects the growth and development of the trees. The excrement can induce coal pollution, which is one of the main pests that harm the Lagerstroemia.
Control methods: strengthen quarantine, prevent pathogen inflow, rational fertilization, enhance plant resistance to insects, maintain ventilation, light transmission, avoid plant density, and combine the winter and early spring pruning to burn the insects. When the number is small, manual scraping is performed.
Powdery mildew of Lagerstroemia:
This kind of pests and diseases is one of our most common ones. The next step is to talk about this. Powdery mildew mainly invades the leaves of Lagerstroemia, and young leaves are more susceptible than old leaves. Young shoots and flower buds can also be infected. White small pink spots appear on the leaves, and after expansion, the round lesions are connected into pieces. In severe cases, the whole leaves are yellow and cause early leaves. The temperature is 19-25 ° C, and the relative humidity is 100%. The most common disease occurs in spring and autumn, especially in autumn. The pathogen is in the bud or mycelium. The closed capsule is overwintered on the fallen leaves, spread by the airflow, and can be infected many times during the growing season. After the occurrence of powdery mildew, the photosynthesis intensity is reduced by more than half, and the transpiration intensity of the diseased leaves is increased, which accelerates leaf senescence and death.
Control method:
1. Strengthen fertilization and pay attention to drainage to avoid excessive humidity.
2, reduce the source of infection, combined with autumn and winter pruning, eliminate disease and dry branches and burned intensively, pay attention to timely removal of diseased buds, diseased leaves and diseased shoots during the growing season.
3. When the plant is infected, it can spray 25% powder rusting wettable powder 3000 times liquid, or 70% methyl thiophanate wettable powder 1000 times liquid, or 80% daisen zinc wettable powder 500 times liquid, and several drugs can be used alternately. Better.
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