Prevent pests in an indoor grow with sanitation, barriers, and monitoring. Clean tools, filter air, quarantine new plants, and inspect leaves twice a week.
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Sanitation
Clean the grow room between cycles. Use a 10% bleach solution or hydrogen peroxide. Remove plant debris and leaves. Wear clean clothes and shoes. Change clothes after visiting another grow. Do not bring outdoor plants inside.
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Air and Environment
Use HEPA filters on air intakes. Keep positive pressure in the room. Set temperature at 68-78°F. Keep humidity at 40-60% in veg and 40-50% in flower. Run fans for air circulation. Avoid dead spots.
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Growing Media and Plants
Use sterilized soil or coco coir. Avoid outdoor soil. Pasteurize reused media. Quarantine new clones for 7-14 days. Inspect the underside of leaves for eggs and insects.
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Monitoring and Traps
Place yellow sticky traps for flying insects. Use blue sticky traps for thrips. Inspect plants twice a week. Look for webbing, spots, and honeydew. Check pots for fungus gnats.
Beneficial Insects and Treatments
Introduce predatory mites (Phytoseiulus persimilis) for spider mites. Use Steinernema feltiae nematodes for fungus gnats. Apply neem oil or insecticidal soap. Follow the label. Do not spray during flower.
Common Pests
- Fungus gnats: overwatering. Larvae live in soil. Adults fly around pots.
- Spider mites: hot, dry conditions. Webbing on leaves. Yellow spots.
- Thrips: silvery streaks on leaves. Black feces. Stunted growth.
- Aphids: sticky honeydew. Curled leaves. Clusters on new growth.