Reasons for the yellowing of leaves on the peace linden and a complete analysis of peace linden maintenance issues.

What Causes the Yellowing of Peace Trees LeavesAs a common ornamental plant in home environments, peace trees are loved for their bright green and glossy leaves. However, the yellowing of leaves during maintenance often troubleshoots plant enthusiasts. This article will systematically analyze the mechanisms of leaf yellowing from three core causes and provide professional solutions.I. Root Health: Prevention and Control Guide for Waterlogging and Root RotSymptom Identification and CausesWhen the potting soil remains moist for more than 3 days, and the leaves show yellowing at the edges and brown tips, be vigilant of waterlogging and root rot. The peace tree roots are sensitive to waterlogging; soil moisture content exceeding 30% inhibits oxygen exchange, leading to root cell asphyxiation and death.Emergency and Maintenance Tips1. Immediately repot and prune: Retain healthy white roots with a diameter >2mm, and cut off the brown roots after sterilizing the pruning shears with 75% alcohol.2. Change potting mix: Use a breathable matrix of perlite: decomposed leaf soil = 1:3, with a 5cm layer of ceramsite at the bottom of the pot for drainage.3. Intelligent water control: Water once a week in spring and summer, and extend to 10-15 days in winter. Insert bamboo sticks to check soil moisture.II. Environmental Control: Comprehensive Strategy for Temperature ManagementFreezing Injury Alert IndicatorsWhen the ambient temperature is below 10°C for 48 consecutive hours, leaves will show water-stained yellow spots. Pay special attention to day-night temperature differences >15°C, which can accelerate the production of yellow leaves due to unbalanced transpiration.Overwintering Protection System1. Temperature buffering: After the start of winter, build a double-layer insulating shed, with an inner layer of PE film and an outer layer of shading net.2. Gradual warming: When transferring frozen plants, the daily warming amplitude should not exceed 3°C.3. Auxiliary measures: Cover the roots with pine scales and wrap the trunk with straw rope to form a 5cm thick insulating layer.III. Biological Control: Comprehensive Management of Diseases and PestsCommon Disease AtlasLeaf spot disease (yellow-brown concentric rings), T-J disease (black-brown edge spots), and scale insects (white waxy substances on the back of leaves) are the three typical pathogenic factors that require microscopic observation to accurately identify the type of pathogen.Targeted Treatment Plan1. Physical removal: Wipe the insect bodies with 75% alcohol cotton pads and cut off the diseased leaves for集中焚烧 (collective burning).2. Chemical control: Alternate the use of 25% prochloraz (fungicide) and 4.5% lambda-cyhalothrin (insecticide), once every 7 days for 3 weeks.3. Ecological adjustment: Maintain proper ventilation and spray EM bacterial solution monthly to enhance plant resistance.By scientifically diagnosing the causes of yellowing leaves, taking targeted preventive and control measures, and combining daily meticulous maintenance, peace trees can quickly return to a healthy state. It is recommended to apply slow-release fertilizer every quarter, maintain a scattered light environment, and keep your peace tree glowing like jade throughout the year.