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Trichoderma for Organic Farms: Application Guide and Benefits
Trichoderma is a naturally-occurring soil fungus that is one of the most researched and most effective biological control agents in organic farming — it outcompetes, parasitises, and destroys the soil-borne pathogenic fungi that cause damping-off, root rot, and wilt diseases. Trichoderma viride and T. harzianum are the two species most widely used in Indian organic farming. They work by: colonising the root zone and competing for space and nutrients that pathogens need; producing enzymes that dissolve pathogen cell walls; and stimulating the plant’s own immune response (inducing systemic resistance). At ₹200–500 per kg, Trichoderma replaces fungicide seed treatments and soil drenches that cost 10–20× more per acre.
4–6 g/kg seed
Trichoderma seed treatment rate — coat seeds before sowing; apply in contact with soil at planting
2–2.5 kg/acre
Soil application rate mixed with compost or FYM — incorporated into root zone
Do not mix with fungicides
Trichoderma is incompatible with copper fungicides and chemical pesticides — it is a living organism
Moist soil application
Apply to moist soil — Trichoderma spores need moisture to activate and colonise; dry soil application is less effective
What Diseases Does Trichoderma Control?
| Disease | Pathogen | Trichoderma Effectiveness |
|---|---|---|
| Damping-off (seedling collapse) | Pythium spp., Fusarium spp. | Excellent — primary use; seed treatment + nursery drench prevents most damping-off |
| Root rot (Phytophthora, Fusarium) | Phytophthora capsici (capsicum), Fusarium oxysporum | Very good — soil application near roots before disease pressure; less effective on established infection |
| Wilt (Fusarium wilt) | Fusarium oxysporum f.sp. lycopersici (tomato) | Good when applied preventively; partial effectiveness on established infection |
| Crown rot (Sclerotium rolfsii) | Sclerotium rolfsii — white mycelium at stem base | Good — Trichoderma parasitises Sclerotium very effectively |
| Collar rot | Pythium spp. | Good when applied at planting as a soil treatment |
| Bacterial diseases | Not applicable | Trichoderma does not control bacterial diseases — use copper oxychloride or other bacterial management |
| Downy mildew, late blight (foliar) | Oomycetes on leaves | Poor — Trichoderma is primarily a soil microbe; not effective against foliar diseases |
How and When Do You Apply Trichoderma?
Application 1 — Seed treatment:
- Take the required seed quantity; lightly moisten seeds with water (just enough to make surface slightly tacky)
- Sprinkle Trichoderma powder at 4–6 grams per kg of seed
- Mix thoroughly; all seeds should be coated with the off-white powder
- Sow immediately (within 24 hours of treatment)
Application 2 — Nursery media drench:
- Dissolve 10 grams Trichoderma in 10 litres of water
- Mix well; allow 30 minutes for spores to hydrate
- Water nursery trays immediately after sowing — approximately 50 ml per cell tray
- The Trichoderma colonises the nursery media and protects germinating seedlings from damping-off
Application 3 — Soil drench at transplanting:
- Dissolve 5 grams Trichoderma in 1 litre of water
- Pour 100 ml into each transplant hole before placing the seedling
- OR: Mix 2–2.5 kg Trichoderma powder with 100 kg of compost or vermicompost; broadcast and incorporate into the top 15 cm of soil before planting
Application 4 — Maintenance soil drench:
- Dissolve 25 grams per 10 litres water
- Apply as soil drench around plant base (200 ml per plant)
- Frequency: once every 30–45 days during the crop season
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| Input | Compatible with Trichoderma? | Notes |
|---|---|---|
| Jeevamrutha | Yes — very compatible | Jeevamrutha microbial community and Trichoderma work synergistically; apply both regularly |
| Vermicompost | Yes — excellent carrier | Mix Trichoderma with vermicompost for soil application; vermicompost provides ideal habitat for Trichoderma to establish |
| Neem oil | Partially — avoid mixing directly | Do not mix in the same spray solution; apply separately with at least 3 days gap |
| Copper oxychloride (allowed organic fungicide) | No — avoid | Copper kills Trichoderma; if copper is needed for a bacterial disease, apply Trichoderma 7–10 days before or after copper application |
| Pseudomonas fluorescens | Yes — complementary | Both are beneficial soil bacteria; compatible and work well together |
| Panchagavya | Yes | Apply separately or with minimal mixing; both benefit soil biology |
| Chemical fungicides (any) | No — incompatible | Chemical fungicides kill Trichoderma; on organic farms this is not an issue, but do not use chemical fungicide and expect Trichoderma to survive |
How Do You Store Trichoderma Products?
Trichoderma is a living organism packaged as spores — storage conditions are critical:
- Store in cool, dry location; ideal 10–15°C; refrigerator is acceptable
- Never store in direct sunlight — UV and heat rapidly kill Trichoderma spores
- Check expiry date; most commercial products are viable for 12–18 months from manufacture
- After opening the packet, seal tightly and use within 3 months
- Verify product quality: a good Trichoderma product smells earthy/musty; green colonies visible in the powder indicate active organisms (Trichoderma produces green spores)
Mix Trichoderma with Vermicompost — The Best Way to Get It into the Root Zone
Trichoderma applied as a powder directly to dry soil has low effectiveness — the spores need moisture and food to activate and colonise. The most effective delivery method: mix Trichoderma powder (2–2.5 kg/acre) with 500 kg of vermicompost; allow 7 days for Trichoderma to colonise the vermicompost (store in a moist shaded area during this time); then broadcast the colonised vermicompost into the beds and water in. The vermicompost provides organic matter, moisture retention, and a microbial community that supports Trichoderma establishment. Trichoderma populations in the colonised vermicompost can be 10–100× higher than in the original powder, creating a far more effective soil treatment. This technique is used by progressive organic farmers in Karnataka with consistently better results than powder application alone.
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