Among orchid enthusiasts, the beauty and elegance of lancao are always highly praised. However, the problem of blackening and rotting of lancao leaves during maintenance has caused many orchid lovers headaches. This not only affects the overall appearance of lancao but may also pose a serious threat to its growth. This article will delve into the reasons for the blackening and rotting of lancao leaves and provide effective preventive measures to help orchid lovers protect their "green gem."
Reasons for the Blackening and Rotting of Lancao Leaves1. Fungal Infection
The most common cause of blackening and rotting of lancao leaves is fungal infection, such as black spot disease and soft rot disease. These fungi can rapidly reproduce in suitable environments, invade the leaves of lancao, causing them to blacken and rot.
2. Improper Water Management
Lancao thrives in a humid environment, but excessive water can lead to root hypoxia, causing root rot, which in turn affects leaf health. Improper water management can also lead to water accumulation on the leaves, triggering the growth of fungi.
3. Insufficient Light
Lancao requires ample sunlight to promote photosynthesis. If it is kept in a dark environment for an extended period, the leaves will lack nutrients, leading to blackening and rotting.
4. Unsuitable Temperature
Lancao is sensitive to temperature, and both high and low temperatures can affect its growth. Unsuitable temperatures can cause leaves to blacken and rot.
5. Improper Fertilization
Excessive or improper fertilization can damage the roots of lancao, affecting leaf health. Improper fertilization can also lead to salt accumulation on the leaves, causing diseases like black spot disease.
Preventive Measures for Blackening and Rotting of Lancao Leaves1. Strengthen Disease Control
Regularly disinfect lancao with fungicides, such as 75% alcohol or 0.1% potassium permanganate solution for foliar spraying. Diseased leaves should be promptly cut off and incinerated to prevent the spread of fungi.
2. Optimize Water Management
Keep the soil moist but avoid waterlogging. When watering, avoid pouring water directly on the leaves to prevent diseases. After watering, ensure timely ventilation to reduce humidity.
3. Adjust Light Conditions
Place lancao in a location with ample scattered light and avoid direct sunlight. If there is insufficient light, adjust the placement accordingly.
4. Control Temperature
Keep the indoor temperature between 15-25°C to avoid high or low temperatures.
5. Rational Fertilization
Fertilize according to the growth needs of lancao, controlling the amount during application and avoiding excess. After fertilizing, water promptly to prevent fertilizer residue.
The reasons for the blackening and rotting of lancao leaves are diverse, but as long as we understand the causes and take corresponding preventive measures, we can effectively avoid this issue. It is hoped that this article can provide useful references for lancao enthusiasts, allowing their plants to thrive under their careful care.