Pest identification
What's eating my thai basil?
Aphids
Signs: Small soft insects on stem tips and undersides of young leaves; stunted, curling shoot tips; sticky honeydew residue.
Control: Blast off with a strong water spray. Apply insecticidal soap solution or a diluted neem oil spray to all leaf surfaces. Repeat every five to seven days. Avoid excess nitrogen feed.
Japanese beetles
Signs: Skeletonised leaves with only the main veins remaining; visible metallic green-bronze beetles on the plant in summer.
Control: Hand-pick beetles into a bucket of soapy water in the early morning. Apply neem oil spray as a deterrent. Avoid pheromone traps, which attract more beetles than they catch.
Slugs and snails
Signs: Irregular ragged holes in young leaves, particularly near soil level; silvery slime trails on leaves and compost surface.
Control: Apply organic slug pellets (ferric phosphate) around the base. Use beer traps or copper tape on container rims. Hand-pick at night. Keep the area free of debris where slugs shelter.
Keep thai basil pest-free
Healthy plants resist pests best. Get the basics right:
- What eats basil — the species this cultivar belongs to
- What eats thai basil — our other guide for the same plant
- What's wrong with my plant? — the diagnosis apps compared
- Common thai basil problems & fixes
- Thai Basil watering schedule
- Thai Basil light requirements
- Full thai basil care guide
Thai Basil pests — FAQ
What is eating my thai basil?
Thai Basil is naturally more pest-resistant than other basil types, but aphids on new shoot tips and Japanese beetles in summer are the main outdoor threats. Indoors, spider mites can emerge in dry conditions. Slugs and earwigs may chew holes in young leaves. Hand-pick beetles, use insecticidal soap for aphids, and use beer traps for slugs.
How do I get rid of aphids on thai basil?
Small soft insects on stem tips and undersides of young leaves; stunted, curling shoot tips; sticky honeydew residue. Blast off with a strong water spray. Apply insecticidal soap solution or a diluted neem oil spray to all leaf surfaces. Repeat every five to seven days. Avoid excess nitrogen feed.
How do I get rid of japanese beetles on thai basil?
Skeletonised leaves with only the main veins remaining; visible metallic green-bronze beetles on the plant in summer. Hand-pick beetles into a bucket of soapy water in the early morning. Apply neem oil spray as a deterrent. Avoid pheromone traps, which attract more beetles than they catch.
How do I get rid of slugs and snails on thai basil?
Irregular ragged holes in young leaves, particularly near soil level; silvery slime trails on leaves and compost surface. Apply organic slug pellets (ferric phosphate) around the base. Use beer traps or copper tape on container rims. Hand-pick at night. Keep the area free of debris where slugs shelter.