What to Do When Rose Leaves Curl
Roses are被誉为 the queens of flowers, but leaf curling issues often plague growers. When rose leaves exhibit abnormal curling, it often indicates that the plant is facing a growth crisis. This article systematically analyzes five common causes and corresponding solutions, accompanied by high-definition real-shot illustrations to help you quickly diagnose the problem.
One: Disease Control: Special Treatment for Powdery Mildew
1.1 Symptom Identification Features
If both new and old leaves curl and are covered with a white powdery substance, it can be diagnosed as powdery mildew infection. This disease commonly occurs in environments with humidity >70% and poor ventilation, with May to June being the peak period.
1.2 Systematic Control Plan
Immediately move to a well-ventilated area, remove the diseased leaves, and apply potassium dihydrogen phosphate (0.2% concentration) to enhance resistance. In severe cases, alternately use 25% pyraclostrobin suspension (1500 times liquid) and 40% flusilazole emulsion (8000 times liquid), spraying the back of the leaves at 7-day intervals.
Two: Water Management: Secrets of Scientific补水
2.1 Judgment of Water Deficiency Symptoms
Leaves become thin and lack luster, potting soil cracks and hardens, and new buds wilt and droop. At this time, the soil moisture content is usually <30%, and immediate watering is required.
2.2 Progressive Watering Techniques
First, loosen the soil to a depth of 3-5 cm with a garden rake, mix in well-rotted pine needles (10% ratio) to improve aeration. The first watering amount should be controlled to half of the usual amount, and water thoroughly after 2 hours to avoid root stress.
Three: Fertilizer Damage Repair: Root Rescue Guide
3.1 Typical Manifestations of Fertilizer Burn
Leaf edges become brown and crispy, new leaves are malformed and curl, and white salt霜 can be seen on the soil surface, with an EC value >2.5ms/cm being excessive.
3.2 Root Repair Process
After removing the pot, soak the root ball in 25°C water for 2 hours, trim the blackened roots to expose the white cross-section. Use a new growing medium of coconut bran: perlite = 7:3, and pause fertilization for 2 weeks.
Four: Pest Control: Comprehensive Control of Thrips
4.1 Key Points for Pest Identification
0.5-1mm yellow insects can be seen on the back of the leaves, the affected leaves show longitudinal curling, and brown spots appear on the flower buds.
4.2 Biochemical Combined Use
Hang blue sticky insect boards (1 per square meter), and spray the back of the leaves with 10% imidacloprid wettable powder (2000 times liquid). In severe cases, apply 22% spirotetramat suspension (5000 times liquid) to the roots.
Five: Environmental Regulation: Preventive Maintenance
Maintain a day-night temperature difference of <10°C and keep the air humidity between 50-65%. Water the roots with EM bacteria solution (300 times) monthly to enhance plant stress resistance. Regularly rotate the flower pot to ensure uniform light exposure from all directions.
Through systematic diagnosis and precise measures, most leaf curling issues can be improved within 2-3 weeks. It is recommended to establish a maintenance log, recording watering and fertilizing times, as well as the occurrence of diseases and pests, to form a personalized maintenance plan. When faced with complex symptoms, samples can be sent to园林 detection institutions for pathogen identification.