The Reasons and Solutions for Wisteria Yellowing Leaves
Wisteria, as a representative flowering plant in summer, often困扰s growers with yellowing leaves. This article systematically analyzes the three main causes of wisteria yellowing leaves, combined with illustrations to explain the treatment plan in detail, helping you quickly diagnose and restore the plant's healthy state.
Wisteria trees undergo about 3 metabolic updates each year, with the bottom old leaves yellowing and falling off first. This type of yellowing leaves shows a uniform fading characteristic, often occurring in spring and autumn, while new leaves remain green.
Wisteria roots are drought-tolerant but not flood-tolerant, and root rot occurs after 3 days of waterlogging. The leaves turn yellow from the edges to the center, accompanied by wilting of branches. It is necessary to dig up the roots for inspection, cut off the brown rot parts, and then disinfect with carbendazim.
White powder disease is common in high humidity environments, with white powdery substances appearing on the leaf surface, followed by the formation of yellow spots. This disease is contagious and requires timely isolation of infected plants, combined with alternate spraying of mancozeb and difenoconazole.
Adopt the "Three-Step Watering Method": observe the soil layer (completely dry 3cm), the leaves (slightly curled), and the season (spring and autumn 5 days/time, summer 3 days/time). Pair with a ceramic stone layer to improve drainage.
Apply lime sulfur mixture in the spring germination period to clean the garden, use carbendazim for prevention every month during the growing period, and use a mixture of tebuconazole and pyraclostrobin at the early stage of the disease, focusing on spraying the back of the leaves.
Apply wound healing agent immediately after trimming yellow leaves, combined with the application of potassium fulvate to promote new root development. Increase the application of organic fertilizer in winter to enhance resistance, increasing the density of new leaves by 40% the following year.
By identifying the causes and corresponding treatments, the problem of wisteria yellowing leaves can be completely controlled. It is recommended to establish a maintenance log, recording watering frequency, fertilization cycles, and pest and disease situations, and adjusting the maintenance plan in combination with the plant's growth stage to keep wisteria green throughout the year.