Aphids on Cannabis Plants
Aphids are small pear-shaped insects (usually green, sometimes black/pink) that cluster on stems and new growth, sucking sap and weakening the plant.
What it looks like
- ●Clusters of small pear-shaped bugs on stems and under leaves
- ●Sticky residue (honeydew) on leaves
- ●Black sooty mold growing on the honeydew
- ●Curled, distorted new growth
Quick diagnostic checks
Measure before you treat
Plant diagnostic essentials
These tools help confirm the cause of aphids before you change nutrients, watering, or the environment.
Carson MicroBrite Pocket Microscope
Inspect leaf undersides for mites, eggs, mildew, and harvest-ready trichomes.
Check price on AmazonGovee Bluetooth Hygrometer
Track temperature and humidity trends instead of guessing from one reading.
Check price on AmazonAC Infinity CLOUDLINE T4
Automate airflow to manage heat, humidity, and mold pressure.
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Causes ranked by likelihood
1. Outdoor or near open windows
Most commonSigns
- ●Grow is near outdoor access
- ●Other plants infested nearby
Fix
- ✓Ladybugs eat 50+ aphids per day — release in the grow
- ✓Neem oil spray (covers eggs and adults)
- ✓Spray with soapy water (1 tsp dish soap per quart)
Recommended products
Captain Jack's Insecticidal Super Soap
Ready-to-use soap spray — knocks down colonies fast
Neem Bliss 100% Cold-Pressed Neem Oil
Follow up every 3 days to break the reproduction cycle
⚠️When to worry
Aphids reproduce fast. Large populations cause real damage in 2 weeks.
Gear that prevents this problem
The right equipment stops most grow problems before they start. Start here:
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