Short answer
Aloe vera plants often develop fine webbing and speckled leaves due to an infestation of spider mites, which thrive in the dry conditions this succulent prefers. The most effective fix is to physically wash the leaves and apply insecticidal soap or neem oil repeatedly until the pests are eradicated.
Seeing fine, dusty webbing and tiny, light-colored stippling on your Aloe vera is a classic sign of spider mite damage. While these pests are annoying, they are manageable if caught early, though they can eventually sap the vigor from your succulent if left unchecked.
Spider mites are attracted to the arid indoor environment that Aloe vera plants need. They suck the sap from the succulent leaves, leaving behind pale speckles and characteristic fine silk webs in the crevices of the plant.
Check: Hold a white sheet of paper under a leaf and tap the plant; look for tiny, dust-like specks moving on the paper.
Fix: Thoroughly rinse the plant with lukewarm water to remove mites, then apply neem oil or insecticidal soap to the foliage every 5-7 days for three weeks.
If the plant has been suddenly moved into much brighter, direct sunlight, the leaf tissue can become dehydrated and stressed. This damage may look like pale speckling that can be mistaken for pest activity.
Check: Check if the discoloration is only appearing on the side of the plant facing the light source.
Fix: Gradually acclimate your Aloe to higher light levels and ensure it is not touching a hot glass windowpane.
While Aloe prefers dry conditions, if the plant was exposed to excess humidity or had water sit in the leaf axils, it may develop fungal infections. These often appear as dark, sunken spots rather than light speckles.
Check: Look for dark brown or black centers within the discolored spots that feel slightly soft to the touch.
Fix: Improve air circulation, avoid overhead watering, and prune away severely affected leaves to prevent the spread of spores.
When to worry
You should act immediately if you see visible webbing or the plant's growth begins to stunt, as spider mites can quickly spread to your entire houseplant collection.
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Diagnose my Aloe VeraNo, you should never mist an Aloe vera. They are desert plants, and excess moisture on the leaves can lead to fungal rot; use a physical wipe-down instead.
Unfortunately, the speckled spots are areas where the plant's cells have been damaged or emptied, and they will likely remain marked even after the pest is gone.
It is usually unnecessary to repot for spider mites, as they primarily live on the foliage. Focus on cleaning the leaves and keeping the plant isolated until the treatment is complete.
Consistent with guidance from: University of California Agriculture and Natural Resources, Royal Horticultural Society.