Disease Prevention and Control of Peace Trees
As a popular choice for indoor greenery, peace trees are loved for their lush leaves and auspicious meanings. However, many growers find that issues such as yellowing leaves and spreading disease spots frequently occur, and in severe cases, they can even lead to plant death. This article systematically reviews the characteristics of three typical diseases and provides professional prevention and treatment solutions to help you protect the health of green plants.
(T-J) Disease: The Culprit of Leaf Grey Spots
Symptom Identification Features
This disease often occurs during the growth period of new leaves, initially presenting as needle-like brown spots, which develop into gray-brown circular spots with diameters of 2-5 cm as the condition progresses. The typical feature is a wavy deep-brown band around the lesion edges, and pink spore piles can be seen in humid conditions.
Scientific Control Solutions
Immediately remove the diseased leaves at the initial onset of the disease and spray with a 25% carbon powder spirit solution diluted 500 times, alternating every 10 days with a 75% methyl thiophanate solution diluted 600 times. It is recommended to use an organic silicon synergist to enhance the adhesion of the medicine, and observe the new leaves after continuous treatment for 4 times.
Brown Spot Disease: The Threat of Black Spots on Leaf Surfaces
Disease Development Process
Initially, purple halos form on the leaf back, and elliptical yellow spots with diameters of 0.5-1 cm appear on the leaf surface. As the disease progresses, black conidial apparatuses develop in the center of the lesions, and in severe cases, multiple spots merge, leading to leaf burn.
Comprehensive Control Strategies
Daily maintenance should keep the air humidity between 50-70%, and when using a 50% benomyl solution diluted 1000 times, foliar fertilizer should be added to enhance resistance. After pruning in winter, apply Bordeaux mixture to the wounds to block the invasion path of pathogenic bacteria.
Brown Root Disease: The Crisis of Root Rot
Systemic Hazard Manifestations
When the plant shows overall wilting, the roots have usually turned brown and rotted. The typical feature is the appearance of longitudinal cracks at the base of the stem, with visible brown streaks in the xylem, accompanied by a pungent sour smell.
Emergency Treatment Measures
At the initial detection, immediately apply a 50% methyl thiophanate solution diluted 800 times to the roots. For severe cases, remove the plant from the pot, prune the rotting roots, soak in a 600 times solution of carbendazim for 1 hour, and then replant in new soil. The tools used should be thoroughly disinfected with 75% alcohol.
By establishing a regular inspection system, combined with temperature and humidity control (maintaining 18-28℃), and reasonable fertilization (applying decomposed cake fertilizer water monthly), the disease resistance of peace trees can be significantly improved. It is recommended to use Bacillus subtilis for biological prevention every quarter, building a healthy microecological environment to keep green plants vibrant for a long time.