Thrips on Houseplants: Damage, Detection & Control

What Are Thrips?

Tiny, slender, winged brown insects (1–2 mm) that rasp leaf, flower, and bud surfaces, leaving silvery patches and black fecal dots. They weaken growth, distort blooms, and transmit viruses.

Integrated Control

• Blue/yellow sticky cards trap flying adults.
• Green Solution (see Scale article) sprayed weekly.
• Neem oil disrupts feeding and reproduction.
• Insecticidal soap for contact kill.
• Beneficial insects (predatory mites, minute pirate bugs) for larger collections.

Prevention

• Inspect new plants; thrips hide in flowers and buds.
• Remove weeds and debris nearby.
• Keep plants healthy—stress attracts pests.

Persistence is key: thrips have rapid life cycles and pesticide resistance. Rotate treatments.