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Common pests in indoor cultivation and how to eliminate them without aggressive chemicals

Pests are the number one headache for indoor growers in Costa Rica. The warm and humid climate favors them, and a closed environment spreads them quickly. In this guide, you'll learn to identify the most common ones, eliminate them, and, most importantly, prevent them. Rule #1: prevention is worth more than treatment A clean environment with good air circulation and healthy plants resists pests much better. IPM (Integrated Pest Management) starts before the bugs appear. → See IPM pest control products at Pachamama The 5 most common indoor pests in Costa Rica 🔴 1. Mites (Tetranychus urticae — spider mites) How to identify them: White or yellow dots on the upper side of the leaves. With a magnifying glass, you'll see the mites and their fine webbing on the underside. Leaves look bronzed or silvery. Conditions that favor them: High temperature (>27°C) and low humidity (<45%). Common in the dry season. Treatment: Apply neem oil or canola oil with potassium soap to the underside of the leaves Raise HR to 55–60% — mites hate humidity For severe infestations: specific miticides (rotate to avoid resistance) → See available neem oil and miticides 🟤 2. Fungus gnats (Bradysia spp.) How to identify them: Small black flies flying around the substrate. Larvae (white, black head) live in the first 5 cm of the substrate and attack roots. Conditions that favor them: Constantly moist substrate on the surface, overwatering. Treatment: Let the top layer of the substrate dry well between waterings Yellow sticky traps for adults Drench with Bacillus thuringiensis var. israelensis (Bti) to kill larvae Beneficial nematodes (Steinernema feltiae) in the substrate 🟡 3. Thrips (Thrips spp.) How to identify them: Silvery marks or whitish spots on the leaves, as if someone sanded them. They are tiny elongated insects (1–2 mm). Conditions that favor them: They enter from outside, especially during the transition from vegetative to flowering. Treatment: Spinosad (organic, very effective) applied foliarly Blue sticky traps Natural predators like Amblyseius cucumeris → See organic insecticides 🟢 4. Whiteflies (Bemisia tabaci / Trialeurodes vaporariorum) How to identify them: Clouds of white flies when moving plants. Yellow eggs and nymphs on the underside of the leaves. Produces honeydew that attracts sooty mold (black fungus). Treatment: Foliar potassium soap (covers the underside well) Yellow traps Natural pyrethrin as a first attack Rotation: neem / spinosad / pyrethrin 🟠 5. Powdery Mildew How to identify it: White-grey powder on leaves and stems. First appears in circular spots that expand. Conditions that favor it: High HR (>60%) with poor air circulation. Very common in Costa Rica during the rainy season. Treatment: Potassium or sodium bicarbonate (foliar, very effective and cheap) Micronized sulfur (preventive and curative) Eucalyptus or clove oil During flowering: be careful with foliar treatments — use approved products for this stage → See fungicides and bactericides at Pachamama Weekly preventive IPM protocol Check the underside of the leaves at each watering (mites, thrips, eggs) Place yellow and blue traps — change them when full Apply preventive neem oil every 7–10 days during vegetative growth (NEVER in late flowering) Keep HR within range with ventilation and dehumidification Quarantine any new plants before introducing them to your space Frequently asked questions Can I use any insecticide during flowering? No. In late flowering, avoid foliar sprays of any kind. Use systemic products only until week 2–3 of flowering. Do organic products work the same as chemical ones? For prevention and mild cases, yes. For severe infestations, chemicals are faster but generate resistance. Always rotate products. Where can I get IPM products in Costa Rica? At Pachamama Indoor Farming, we have the most complete line of pest control for indoor cultivation in the country.