What should I do if the magnolia leaves turn yellow? Analyze causes and solutions
As a common ornamental plant, magnolia is loved by people for its elegant flowers and green leaves. However, many florists have recently reported that the leaves of magnolias have turned yellow, affecting their ornamental value. This article will combine the hot gardening topics on the Internet in the past 10 days, analyze the common causes of yellowing of magnolia leaves, and provide scientific solutions.
1. Common causes of yellowing of magnolia leaves
| Reason type | Specific performance | Proportion (whole network data) |
|---|---|---|
| Moisture problem | Watering too much or too little | 35% |
| nutritional deficiencies | Iron deficiency, nitrogen deficiency, etc. | 28% |
| pests and diseases | Spider mites, leaf spot, etc. | 20% |
| environmental factors | Insufficient light and soil compaction | 12% |
| other reasons | Transplanting shock, phytotoxicity, etc. | 5% |
2. Targeted solutions
1. Moisture management:Magnolia flowers like moisture but are afraid of water accumulation. It is recommended to water every 2-3 days during the high temperature period in summer, and this can be extended to 5-7 days in winter. When potting magnolias, make sure the drainage holes at the bottom of the pot are clear.
2. Nutritional supplements:For iron-deficient yellow leaves (green veins and yellow mesophyll), ferrous sulfate solution (1:1000 ratio) can be applied; for general nutritional deficiencies, slow-release fertilizers are recommended and applied once a quarter.
3. Pest and disease control:
| Types of pests and diseases | Identifying features | Prevention and control methods |
|---|---|---|
| Starscream | There are red dots and spider webs on the back of the leaves | Spray abamectin |
| leaf spot disease | Brown spots appear on leaves | Cut off diseased leaves + spray with carbendazim |
4. Environment optimization:Magnolias need at least 6 hours of light per day. Ground-planted plants should avoid planting in low-lying waterlogged areas; for potted plants, it is recommended to change the soil every two years and use loose, fertile, acidic soil.
3. Recent popular maintenance techniques
According to gardening forum data in the past 10 days, the following methods have received high discussion:
• Coffee grounds improve soil:Mix the dried coffee grounds into the potting soil at a ratio of 1:5, which can improve the acidity and increase organic matter (note that it must be completely decomposed).
• Banana peels provide potassium:Chop the banana peel into pieces and bury it in the soil to slowly release potassium, which is especially suitable for nutritional supplements before the flowering period.
• Emergency treatment plan:When a large area of yellow leaves appears, a three-step first aid method of "cutting 1/3 of the yellow leaves + root irrigation + shading treatment" can be adopted.
4. Timetable of preventive measures
| season | Key preventive measures |
|---|---|
| spring | Apply sprout fertilizer to prevent aphids |
| summer | Sunscreen, moisturizing, and red spider mite prevention |
| autumn | Topdressing of phosphorus and potassium fertilizers, garden cleaning and disinfection |
| winter | Prevent frostbite, control water and stop fertilizers |
5. Expert reminder
Professor Wang, an expert from the China Flower Association, pointed out: "Yellow leaves of magnolia flowers are often caused by the superposition of multiple factors. It is recommended to use the elimination method to diagnose step by step. The yellow leaves of newly purchased plants are mostly due to the process of environmental adaptation, and generally can recover on their own after 2-3 weeks."
If there is no improvement within 2 weeks after taking the above measures, it is recommended to take clear photos of the front and back of the leaves, record maintenance logs, and consult the local agricultural technology extension station or professional horticulture agency.
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