Bugs on houseplants? Spots & brown spots | Plant Magic

Stains, brown spots, or bugs? Here's how to recognize the problem and tackle it.

Suddenly seeing brown spots, yellow spots, sticky leaves, or tiny bugs? Don't panic. These quick checks will help you discover what's likely wrong—and what you can do step by step to help your plant recover smoothly.

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The 2-Minute Check (Do This First)

• Check under the leaf (that's where pests are most often found).
• Wipe a piece of white paper along the underside of the leaf: if you see small stripes or dots, it could be thrips.
• Look for stickiness (honeydew): this often indicates mealy bugs, aphids or scale insects.
• Check the potting soil : is it constantly wet? Then fungus gnats are more likely to appear.
• Pay attention to the location : bright sun and dry air will more quickly cause brown tips or leaf damage.

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Brown spots / dry edges (often not a problem)

Brown spots or dry edges are usually caused by dry air, heat (radiator), too much sun or irregular watering.

Specific to finger plant? See: Brown tips on finger plant → Read more

What you do

1. Check water : soil that is slightly moist is okay; soaking wet or bone dry = adjust.
2. Place the plant in a quieter place : away from radiators and bright midday sun.
3. Clean the leaves with lukewarm water (dust hinders light absorption).
4. Only cut away dead edges (not in green leaf tissue).

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Yellow spots, dots or "silvery" patches

This could be due to site stress, but it could also be a pest (especially thrips or spider mites). Therefore, always check under the leaves and along the veins.

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The most common pests (recognize + deal with)

1) Spider

• Identification: very fine webs, small light spots on the leaves, leaves appear dull. Often occurs in dry air.
• Approach: isolate the plant, rinse the leaves (including the underside), then treat and repeat.

Spider mites? Check out the complete guide with a quick diagnosis and step-by-step plan: spider mites on houseplants .

2) Trips

• Identification: silvery stripes/spots, small black dots (poo), rapid leaf damage. With the white paper, you can sometimes see small "stripes" moving.
• Approach: Isolate the plant, remove affected leaves if severe, treat and repeat rigorously.

Thrips? Recognize silvery spots and black dots and follow the steps: Thrips on houseplants .

3) Mealybug / scale insect

• Recognition: white “cotton wool” (mealybug) or hard scales (scale insect), often sticky leaves.
• Approach: Remove manually (cotton swab), then treat and check regularly.

4) Fungus gnats (around the potting soil)

• Identification: small black flies near the potting soil. The cause is almost always: potting soil stays wet for too long.
• Approach: Let the topsoil dry, water less often, and tackle the problem at the source.
  
  

5) Spider mites?
View the complete guide with a quick diagnosis and step-by-step plan for spider mites on houseplants here.

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Step-by-step plan: how to tackle pests safely

1. Isolate the plant (put it aside for a while) so that the disease doesn't spread.
2. Rinse the leaves with lukewarm water (including the underside). This will remove many bugs.
3. Treat specifically according to the product or method you choose.
4. Repeat is key : check and treat every few days/weekly (depending on the infestation) until it is truly gone.
5. Check your routine : pests are more likely to return when stressed (too dark, too dry, too wet, too warm).

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When is it not a plague but “normal” damage?

• Old leaves at the bottom turn yellow and die, while new leaves are healthy.
• 1–2 leaves with tips after a move or change in temperature.
• A spot that has been in direct sunlight (leaf burn is dry and light brown).

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Frequently asked mini questions

• Do I have to treat every spot?
  No. First, check if you actually see any bugs. If in doubt, cleaning and monitoring is often the best first step.
• Why do plagues keep coming back?
  Because eggs/larvae remain. Repeating and monitoring is more important than one "hard" treatment.
• Can I remove affected leaves?
  Yes, especially if it's severely damaged. This gives the plant a chance to rest and reduces pest pressure.

Want to give your plant some extra support? Check out our care collection . And if you want to keep things simple, start with a strong selection from our easy-care houseplants .

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