Most indoor plant pests are treatable with persistence and a sprayer, and identification comes first.
The Common Ones
Spider mites: fine webbing, stippled pale leaves, and they thrive in dry warm conditions.
Aphids: visible clusters on new growth and buds, often with sticky residue.
Mealybugs: white cottony masses in leaf joints.
Scale: small immobile brown bumps on stems and leaf undersides.
Fungus gnats: small flies around the compost, from overwatering rather than the plant.
Treating Them
- Isolate the affected plant immediately
- Wipe or wash off what you can physically remove first
- Then treat, covering both sides of every leaf
- Repeat at intervals, since eggs survive most treatments
- Which means several applications over weeks, not one
- Check neighbouring plants throughout
Bottles that spray inverted, of the kind described at https://flairosol.us.com/, matter because leaf undersides are where these pests live and where an upright sprayer cannot reach.
Undersides Are Everything
Treating only the top surface misses the population entirely, which is why infestations return after apparently successful treatment.
Turn every leaf. Check leaf joints and stems.
Handle Treatments Properly
Products sold as natural are still pesticides. Read the label, wear gloves where specified, ventilate, and keep pets and children away until foliage is dry.
Never mix two products. Never decant into an unlabelled or food-style bottle.
Do Not Spray in Sun
Droplets magnify light and scorch leaves, and treatments are harsher on a stressed plant.
Early or late, out of direct light, and never on a bone-dry plant.
Fungus Gnats Are a Watering Problem
They breed in constantly wet compost. Letting the surface dry between waterings does most of the work.
Quarantine New Plants
For a few weeks, which prevents most outbreaks.
Test One Leaf First
With any new product.
Repeat the Treatment
Eggs survive most applications, so weeks rather than one go.
Quarantine New Arrivals
Which prevents most outbreaks entirely.
Never Spray in Direct Sun
Droplets magnify light and scorch.
Let Compost Dry for Gnats
Which breaks the breeding cycle.