Hibiscus, as a traditional ornamental plant in China, is deeply loved by people. During the maintenance process, the problem of rotting hibiscus leaves often plagues hibiscus lovers. This article will introduce in detail the reasons for the rotting of hibiscus leaves and the control methods, helping you solve this problem.
Reasons for the Rotting of Hibiscus Leaves1. Fungal Infection
The main reason for the rotting of hibiscus leaves is fungal infection, such as black spot disease, anthracnose, and gray mold disease. These fungi thrive easily in humid and poorly ventilated environments, encroaching on hibiscus leaves.
2. Pest Infestation
Pest infestation is also one of the reasons for the rotting of hibiscus leaves. Common pests include aphids, spider mites, and scale insects, which absorb plant sap and cause leaves to turn yellow and rot.
3. Improper Fertilization and Watering Management
Excessive or insufficient fertilization and improper watering can lead to the rotting of hibiscus leaves. Over-fertilization can cause soil salinization, affecting plant growth, while excessive watering can lead to root hypoxia and cause root rot.
4. Insufficient Light
Hibiscus enjoys sunlight. If it remains in a dark environment for a long time, the leaves are prone to yellowing and rotting.
Control Methods1. Strengthen Disease Control
(1) Timely removal of diseased leaves and branches to prevent the spread of fungi.
(2) Reasonable fertilization to enhance plant disease resistance.
(3) Spraying fungicides such as Bordeaux mixture and carbendazim.
2. Control Pest Infestation
(1) Regularly inspect the plants and deal with pest problems in a timely manner.
(2) Spraying insecticides such as pymetrozine and abamectin.
3. Optimize Fertilization and Watering Management
(1) Reasonable fertilization to avoid over-fertilization.
(2) Keep the soil moist and avoid waterlogging.
4. Improve Light Conditions
(1) Plant hibiscus in a sunny location.
(2) Prune appropriately during the growing season to maintain ventilation and light penetration.
There are various reasons for the rotting of hibiscus leaves, mainly including fungal infection, pest infestation, improper fertilization and watering management, and insufficient light. By taking corresponding control measures for these reasons, the problem of rotting hibiscus leaves can be effectively solved. It is hoped that this article can provide help for your hibiscus cultivation journey.
References:
China Flower News, October 26, 2019, "Manual of Flower Disease and Pest Control" by Zhang Yongzhong, China Agricultural Press.