Aphids on Cannabis: Sticky Leaves and Curling Growth
By The Budometry TeamPublished Updated
Aphids cluster on the softest new growth and stem tips, drinking sap and excreting sticky honeydew that then grows sooty mold.
Part of our pillar guide: Plant Training, Pests and Troubleshooting
Identifying
Visible clusters of pear-shaped insects, usually green, black, or grey. Curled, distorted new growth. A shiny, sticky film on leaves below the cluster.
Control
Knock them off with a firm water spray first — it removes most of the population instantly. Follow with insecticidal soap every 4-5 days. Ladybugs are an effective biological control in enclosed tents.
Watch for ants
Ants farm aphids for honeydew and will actively defend them. If you have ants in the grow space, dealing with the ants is part of dealing with the aphids.
Frequently asked questions
- Does the sticky residue harm the plant?
- Indirectly. Sooty mold grows on honeydew and blocks light on the leaf surface.
The full guide on this topic
Plant Training, Pests and Troubleshooting
Topping, LST and SCROG explained, plus how to identify and stop spider mites, fungus gnats and powdery mildew, and how to read leaf symptoms correctly.