What to Do When the Leaves of Rieger Begonia Turn Yellow
Rieger Begonia is loved for its brilliant flower colors, but the yellowing of leaves during maintenance often troubleshoots enthusiasts. This article systematically analyzes the four major core causes and corresponding treatment plans, along with exclusive maintenance techniques to help you quickly restore the vitality of the plant.
One: Key Techniques for Water Regulation
1. Identification and Emergency Treatment for Yellow Leaves Due to Water Deficiency
Overall yellowing of the plant and cracked soil are typical signs of water deficiency. It is recommended to use a progressive watering method: first, spray to increase the ambient humidity, then water thoroughly along the pot edge 2 hours later, avoiding watering during high-temperature periods to stimulate the roots. Special reminder: In winter, keep the substrate slightly moist, and maintain the air humidity at 60% or above.
2. Treatment Process for Root Rot Caused by Waterlogging
Long-term wet soil can cause root suffocation, which is manifested by the yellowing and falling of old leaves. The emergency response involves four steps: ① Trim the diseased and weak roots, retaining the healthy parts ② Replace with a breathable substrate (perlite: peat = 1:3) ③ Use陶粒 at the bottom of the pot to enhance drainage ④ Use the immersion method to water during the initial maintenance period. Data shows that the survival rate can be increased to 85% using this method.
Two: Scientific Light Management Plan
3-4 hours of soft light exposure per day is optimal, direct strong sunlight can cause sunburn spots, and insufficient light can lead to yellowing of new leaves. It is recommended to place the plant near an east-facing window, receiving sunlight before 10 am in summer, and using a sunshade net to filter strong midday light. Lighting tip: In winter, pair with a full-spectrum plant light, 30 cm away from the plant, providing 2 hours of supplemental light daily.
Three: Precision Fertilization Operating Guide
During the growing season (March-September), apply diluted 20-20-20 water-soluble fertilizer (2000 times) every 15 days, and immediately rinse the pot soil with water 3 times if fertilizer damage occurs. When the plant lacks nutrients, the leaves show uniform light yellowing, at which point a 0.1% ferrous sulfate solution can be sprayed on the leaves. Important note: Avoid direct strong sunlight within 24 hours after fertilizing.
Four: Comprehensive Pest and Disease Control System
When attacked by red spiders, the leaves show dense yellow spots; it is recommended to spray 33% spirodiclofen 2000 times solution continuously for 3 times (with a 5-day interval). For leaf spot disease, cut off the diseased leaves and spray 50% carbendazim 800 times solution. Preventive measures: Wipe the back of the leaves with garlic extract (1:50) monthly, effectively reducing the incidence of pests by 80%.
By systematically adjusting water, fertilizer, and light, and combining regular pest and disease prevention, Rieger Begonia can recover to a healthy state within 1 month. It is recommended to establish a maintenance log, recording watering times, fertilizer amounts, and plant responses, gradually mastering the rhythm of personalized care.