Common Pests and Diseases of Chinese Pink and Control Methods
As a colorful succulent plant, Chinese pink is deeply loved in courtyard planting. However, its fleshy roots make the plant susceptible to pests and diseases. This article systematically sorts out the identification skills and control plans for typical conditions such as black rot and whitefly, helping you create a healthy flowerbed.
Complete Control Guide for Black Rot of Chinese Pink
Symptom Identification and Incidence Patterns
Black rot has the typical characteristics of succulent plant diseases: initially, the leaves turn yellow and develop a grayish-white mold layer, followed by browning and rotting in the rootstock. This disease is highly likely to break out when the air humidity is over 80% and there is continuous rain. In the Pearl River Delta region, the incidence rate can reach 45% in June and July. Special attention should be paid to the drainage of the fleshy roots, as积水 for 12 hours may trigger the disease.
Detailed Explanation of a Three-Level Prevention and Control System
1. Prevention stage: Use a growing medium with 40% granular soil and spray Benomyl 600 times liquid before the rainy season; 2. Initial treatment: Immediately cut off the diseased leaves when local mold spots are found, and apply wood ash to the cut; 3. Severe treatment: When the whole plant withers, remove the pot and repair the roots, then soak the roots in Mancozeb 200 times liquid for 20 minutes before repotting.
Comprehensive Management Plan for Whitefly on Chinese Pink
Insect Pest Characteristics and Harm Cycle
Adult whiteflies are 1.5mm long,聚集 on the back of leaves to absorb sap, and secrete honeydew that causes sooty mold. Laboratory data shows that when the insect density per plant exceeds 50, photosynthetic efficiency decreases by 62%, and fruit setting rate drops by 84%. This pest has severe overlapping generations, with one generation of reproduction completed every 20 days at 28°C.
Combined Physical and Chemical Control
1. Physical control: Hang yellow sticky insect boards (1 per square meter), and manually shake off the adults early in the morning; 2. Biological control: Release 300 Encarsia formosa per mu; 3. Chemical control: Alternate between using 25% Thiazine 2000 times liquid and 5% Abamectin emulsion, focusing on spraying the back of the leaves.
Three Key Elements for Healthy Maintenance of Chinese Pink
1. Light management: 4-6 hours of direct sunlight per day, with 40% shading required in summer; 2. Water and fertilizer control: Apply phosphorus and potassium fertilizer (N-P-K=5-10-10) once a month during the growing season, maintaining a substrate moisture content of 30%-40%; 3. Environmental control: Maintain a day-night temperature difference of 8-10°C, and strengthen ventilation to reduce humidity.
By establishing a disease warning mechanism and a scientific maintenance system, the incidence of diseases and pests in Chinese pink can be reduced by 70%. It is recommended that planters conduct a systematic inspection every 15 days, focusing on susceptible areas such as the back of leaves and the junction of rootstocks, to ensure early detection and treatment for healthy plant growth.