Causes and treatment methods for dragon spitting out yellow leaves
As a tropical plant with high ornamental value, Longtuzhu has yellowing of its leaves, which troubles many horticultural enthusiasts. This paper will systematically analyze the underlying causes of leaf yellowing from the three core dimensions of water regulation, light management and pest control, and provide highly operable professional solutions. Imbalanced water management leads to water shortage symptoms and water replenishment strategies of Longtuzhu's yellow leaves. Longtuzhu's average daily water requirement reaches 500-800ml during the growth period. When the leaves are short of water, typical symptoms such as scorched edges and yellowing veins will appear. It is recommended to use the "fingertip test method": insert your index finger into the soil 2 cm away, and water it if it feels dry. The rice washing water needs to be fermented for 3 days and then diluted. Combined with foliar spray, it can increase the air humidity to more than 60%. Improper lighting conditions cause metabolic disorders. Light requirements and placement techniques. Longtuzhu needs to receive 4-6 hours of scattered light every day. Long-term levels below 2000lux will lead to inhibition of chlorophyll synthesis. It is recommended to place the plants on the southeastern window sill and use a sunshade net to adjust for summer light. In winter, you can use LED plant fill light to keep the light intensity in the range of 3000-5000lux, and pay attention to rotating the flowerpot 45 degrees every week to ensure uniform light reception. Invasion and damage leaf structure Common pest identification and control Aphids gather on tender tips to secrete honey, red spiders weave webs on the back of leaves, and blowing mistans form a white waxy layer. Biological control methods are recommended: release ladybugs to control aphids, and spray azadirachtin solution to deal with red spiders. During chemical control, imidacloprid (1:1500) and spirotetramat (1:2000) were used alternately. After application, ventilation was strengthened to maintain the air circulation speed> 0.5 m/s.
By accurately regulating water supply, optimizing lighting plans, and establishing a pest prevention system, the problem of yellow leaves of Longtuzhu can be effectively solved. It is recommended to conduct leaf microscopic examination every month, use an EC value detector to monitor soil conditions, and cooperate with regular pruning to keep the plant type transparent, so that Longtuzhu can reproduce its jade-like luster leaves.