Identify & Control Spider Mites on Houseplants & Garden Plants

Spider mites are microscopic arachnids that suck plant sap, causing stippling, bronzing, leaf drop, and fine webbing. They reproduce rapidly in hot, dry conditions—females lay 100–200 eggs in 10-day cycles. Even sturdy plants like dieffenbachia succumb to heavy infestations.

Detection

• Check leaf undersides with a magnifying glass.
• Look for pale stippling (mottling) on upper leaf surfaces.
• Fine webbing at leaf-stem junctions indicates established colonies.
• Random leaf yellowing and premature drop.

Prevention

• Increase humidity—mites hate moisture.
• Inspect new plants thoroughly; quarantine 2 weeks.
• Avoid hot, dry microclimates near heaters/vents.
• Regularly shower foliage to dislodge early colonists.

Treatment

1. Isolate infested plants immediately.
2. Physical removal: Strong water spray (especially undersides) repeated every 3–4 days.
3. Biological control: Release predatory mites (Phytoseiulus) or ladybugs—they consume all life stages.
4. Organic sprays: Insecticidal soap, neem oil, or horticultural oil applied per label. Repeat weekly for 3+ weeks to break the cycle.
5. Soil treatment: Eggs overwinter in soil; repot with sterile mix if persistent.

Early action prevents population explosions. Monitor weekly during warm, dry periods.