The reason why the leaves of white palm have white marks
As a popular leaf-viewing plant, white spots appearing on its leaves often confuse conservators. These mysterious white spots may imply plant health problems. This article will deeply analyze the three major causes and provide systematic solutions. Pathological analysis of white spots of white palm, powdery mildew infection characteristics, powdery mildew is a typical manifestation of a fungal disease. At the beginning, needle-like white spots form on the back of the leaves, and as the disease develops, a cotton flocculent mycelium cover will form. The lesion has the following characteristics: 1. Most common in the middle and lower parts of old leaves 2. Asymmetric distribution appears on the front and back 3. As the leaves curl and deform, it is recommended to spray 40% flusilazole emulsifiable concentrate at 800 times continuously three times a week, and cut off the diseased leaves and isolate them. Aphid hazard identification Aphids gathering can lead to two typical white spots: ·Mechanical damage spots caused by piercing and sucking mouthparts·Mold spots caused by secretions. Focus on the leaf axils and tender parts, and found that the insect body can be treated locally with 75% alcohol cotton swabs. When a large-scale outbreak, use 10% imidacloprid wettable powder to spray at 2000 times. The physiological causes of white spots of white palm are the imbalance between water and fertilizer. The water-deficient white spots mostly spread from the leaf edge to the center, showing an irregular cloud shape. It is recommended to use the "dipping basin method" to replenish water: ① immerse the flower pot in the water basin for 15 minutes ② Drain the excess water and return to its place ③ Use 0.1% potassium dihydrogen phosphate foliar fertilizer to supplement nutrition and environmental control points to maintain 60%-70% air humidity, Avoid direct sunlight. It is recommended to use a three-layer curing method: ·Lay ceramite on the bottom layer to increase air permeability·Use peat soil mixed with perlite in the middle layer·Cover the surface with pine scales to maintain humidity. Through systematic prevention, the white spots can be significantly improved in about 2-3 weeks. Regularly check the back of the leaves with a magnifying glass, apply biological bacterial fertilizer every month to enhance resistance, and let the white palm regain its oily and green color.