Short answer
Fine webbing and speckled, stippled leaves on your Monstera deliciosa are almost certainly signs of a spider mite infestation. These pests thrive in the dry indoor air that Monstera plants often struggle with, so the single most effective fix is to physically wash the leaves and apply neem oil or insecticidal soap on a weekly schedule.
Spider mites are tiny arachnids that pierce the leaf cells of your Monstera to feed, leading to that characteristic 'speckled' or stippled look on the foliage. While these pests are small and often go unnoticed until webbing appears, they can cause significant damage to the plant's health if left unchecked.
Monstera deliciosa are prone to spider mites, especially when kept in lower humidity environments. The mites congregate on the undersides of the broad leaves, creating delicate silk webs and causing pale, speckled spots.
Check: Check the undersides of the leaves near the veins for tiny, moving specks or fine, dusty webbing.
Fix: Isolate the plant, wash the leaves thoroughly under lukewarm water to remove active mites, and treat with neem oil or insecticidal soap every 5-7 days for at least three weeks.
Thrips are thin, fast-moving insects that can also cause stippling and discolored patches on Monstera foliage. While the damage can mimic mites, thrips often leave behind small, dark fecal spots on the leaves.
Check: Look for tiny, slender, black or straw-colored insects crawling on the leaf surface or within the webbing.
Fix: Wipe leaves with a damp cloth, use sticky traps to catch adults, and apply a systemic insecticide or neem oil consistently.
While low humidity itself causes crispy edges, it also weakens the plant's natural defenses, making it far more susceptible to pest colonization. If the environment is extremely dry, the plant may show stress that makes it an easy target for mite outbreaks.
Check: Ensure the air is not extremely dry; Monstera prefer humidity above 50% and will suffer if placed near heaters or vents.
Fix: Use a humidifier or a pebble tray to stabilize humidity and prune severely damaged, infested foliage to prevent spread.
When to worry
You should treat this as an emergency as soon as you see webbing, as mites reproduce rapidly and can cause the death of mature leaves in weeks.
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Diagnose my MonsteraIf the damage is extensive, pruning the affected leaves can reduce the overall pest population. However, if the leaf is still largely green and healthy, you can treat it and keep it.
Increasing humidity will discourage mites from returning, but it will not kill an established population. You must use a physical wash and a contact insecticide to eradicate them.
Generally, no, as spider mites live on the foliage rather than in the soil. Focus your treatment on the leaves and stems rather than disturbing the root system.
Consistent with guidance from: Royal Horticultural Society, University of California Integrated Pest Management Program.