What to Do If There Are Black Spots on Aloe Vera
As a common succulent plant in homes, aloe vera leaves with black spots often cause concern for growers. Not only do black spots affect the ornamental value, they may also indicate potential health issues for the plant. This article will systematically analyze the causes and solutions of black spots on aloe vera from three dimensions: temperature control, pest management, and disease prevention.
Temperature Control for Black Spots on Aloe Vera
Analysis of Low Temperature Frost Injury Causes
Aloe vera is native to tropical regions. When the ambient temperature is below 10℃, the crystallization of cell fluid can damage the mesophyll tissue. Areas such as window sills and north-facing balconies in winter are prone to frost damage, forming sunken black spots on the edges.
Practical Schemes for Constant Temperature Maintenance
It is recommended to use a smart shelf with a temperature display to maintain an ideal range of 15-28℃. During cold spells, you can use a thermal film to cover at night, combined with supplementary lights to extend the lighting time and help the plant restore cell vitality.
Pest Management for Black Spots on Aloe Vera
Identification Features of Pests
Aphids gather on the back of leaves to absorb sap, causing black honeydew contamination; scale insects form brown shields on leaf veins, and their secretions induce sooty mold disease. Both can lead to star-shaped black spots.
Three-Step Biocontrol Method
First, physically remove the pests with 75% alcohol cotton pads, then spray plant-derived insecticides such as matrine. In severe infections, alternately use imidacloprid and dinotefuran, taking care to rotate the drugs to avoid resistance.
Disease Prevention for Black Spots on Aloe Vera
Pathological Mechanism of Leaf Spot Disease
In a high temperature and humidity environment, the (T-J) pathogen invades through the stomata, initially forming watersoaked round spots, and later turning into black necrotic areas. The lesions have distinct concentric patterns and need to be distinguished from physical damage.
Environmental Optimization Strategies
Use ceramsite to cover the surface to enhance breathability, combined with a ceiling fan to create an air circulation. In the early stage of the disease, remove the diseased leaves and then spray the entire plant with a 800x solution of mancozeb, once a week for three consecutive weeks.
By monitoring temperature, preventing pests, and managing diseases in a three-dimensional maintenance system, the black spot problem of aloe vera can be effectively controlled. Regularly observe the back of the leaves with a magnifying glass, maintain a day-night temperature difference of less than 8℃, and use bamboo water-diverting pots to keep the aloe vera maintaining a bright and translucent texture. Remember, prevention is better than cure, and establishing a healthy growth environment is the fundamental solution.