With the arrival of autumn, many families plant some cassia in their own gardens or balconies. Cassia not only has a strong fragrance but also beautifies the environment. Many flower enthusiasts find that the leaves of their cassia begin to turn yellow and develop spots. This not only affects the appearance of cassia but may also threaten its healthy growth. This article will provide a detailed analysis of the reasons for the yellowing and spotting of cassia leaves and offer corresponding prevention and control methods.
Reasons for the yellowing and spotting of cassia leaves1. Improper water management
Cassia prefers a humid environment, but excessive water can lead to root hypoxia, causing yellowing and spotting of leaves. Uneven watering may also cause some leaves to turn yellow due to lack of water.
2. Insufficient sunlight
Cassia requires ample sunlight. If it is kept in a dark environment for a long time, the leaves may develop yellowing and spots.
3. Soil problems
Soil that is too compacted, has an unsuitable pH level, or lacks organic matter can lead to yellowing and spotting of cassia leaves.
4. Pest and disease attacks
Yellowing and spotting of cassia leaves may also be caused by pest and disease attacks, such as powdery mildew and red spider mites.
5. Improper fertilization
Excessive fertilization or uneven fertilization, leading to nutrient excess or deficiency, may cause yellowing and spotting of leaves.
Prevention and control methods for the yellowing and spotting of cassia leaves1. Improve water management
Watering should be moderate, keeping the soil moist but not waterlogged. During the hot summer, reduce watering frequency appropriately, ensure even watering, and avoid water accumulation.
2. Provide sufficient sunlight
Place cassia in a sunny location, ensuring it receives at least 4 hours of direct sunlight daily.
3. Improve soil conditions
Regularly loosen the soil, increase soil organic matter, adjust the soil pH level to maintain it between 6.5-7.5 according to the soil pH.
4. Control pests and diseases
Regularly inspect cassia, take timely measures when pests and diseases are found. For powdery mildew, a 25% carbendazim wettable powder solution can be sprayed at a concentration of 1000 times; for red spider mites, a 40% abamectin emulsion can be sprayed at a concentration of 1500 times.
5. Reasonable fertilization
Fertilize according to the growth needs of cassia. Apply nitrogen fertilizer in spring to promote branch and leaf growth; apply phosphorus and potassium fertilizers in summer to promote flowering; apply compound fertilizers in autumn to store nutrients for the next year's growth.
The reasons for the yellowing and spotting of cassia leaves are multifaceted, but as long as we understand the reasons and take corresponding preventive and control measures, we can effectively solve the problem. It is hoped that this article will be helpful to many flower enthusiasts, allowing your cassia to grow healthily and bloom beautiful flowers.
References:
[1] Li Ming, Zhang Xiaohong. Research on the control technology of cassia pests and diseases [J]. China Agricultural Science and Technology Herald, 2018, 20(10): 112-115.
[2] Zhao Lili, Liu Yang, Wang Lina. Cassia cultivation techniques and pest and disease control [J]. China Horticulture, 2019, 36(2): 56-59.