Trichoderma is a beneficial fungus used as a bio-fungicide in agriculture. Unlike chemical fungicides that kill fungi directly, Trichoderma works as a friendly microorganism that protects plants by controlling harmful fungi in the soil and around the roots. Farmers use it to reduce problems like damping-off, root rot, collar rot, wilt, and other soil-borne diseases in many crops such as vegetables, pulses, cereals, spices, fruit plants, and nursery seedlings. When used correctly, Trichoderma improves root growth, helps better nutrient uptake, and builds healthier soil over time.
Trichoderma works in a few simple ways. First, it competes with harmful fungi for space and food near the root zone. Second, it directly attacks some disease-causing fungi and stops them from multiplying. Third, it stimulates the plant’s natural defense system, so the plant becomes more resistant to disease. Because it is living, Trichoderma needs moisture and organic matter to survive and multiply. It does not give instant results like strong chemicals, but it gives long-term protection when used regularly.
There are three common methods of using Trichoderma: seed treatment, soil application, and root dip or nursery treatment.
Seed treatment is one of the easiest methods. Before sowing, mix Trichoderma powder with a little water to make a light slurry and coat the seeds uniformly. Dry the seeds in shade for 30 minutes and then sow. This helps protect young seedlings from early fungal attacks. For large seeds and pulses, seed treatment works very well. If you are also using Rhizobium or other biofertilizers, apply Trichoderma first, let seeds dry, and then apply biofertilizer, so both work properly.
Soil application is useful for field crops, vegetables, and orchards. Trichoderma should be mixed with well-decomposed farmyard manure or compost and then applied to the soil. The compost acts as food and helps Trichoderma multiply. Many farmers mix Trichoderma in 50–100 kg compost for one acre, keep it in shade for a day with slight moisture, and then broadcast it in the field and mix lightly into soil. In orchards, apply this mixture in the basin area under the tree canopy and cover with soil. Soil application is best done when there is enough moisture in the soil, such as before irrigation or during the start of rainy season.
Root dip method is mainly used for transplanted crops like chilli, tomato, brinjal, cabbage, onion seedlings, and also for some fruit plant saplings. Prepare a Trichoderma solution in water and dip the seedling roots for a few minutes before transplanting. This helps Trichoderma settle on the roots quickly and protect them in the new field. For nursery beds, Trichoderma can also be mixed in compost and applied to the nursery soil to reduce damping-off and seedling mortality.
Some farmers also use Trichoderma through drip irrigation as a drench, but it works best when applied with organic matter and when chemical residues are low. If the soil has recently received strong chemical fungicides, Trichoderma survival can reduce. So, avoid applying chemical fungicides immediately before or after Trichoderma. If chemical control is necessary, keep a gap and use Trichoderma later to rebuild beneficial microbes.
There are a few important precautions. Always buy Trichoderma from a trusted source and check the expiry date. Store it in a cool, dry place away from sunlight. Do not mix Trichoderma with strong pesticides or fungicides in the same tank. Apply it in the evening or early morning if possible, and maintain soil moisture after application so it can multiply. Using organic mulching and compost improves results.
In simple terms, Trichoderma is best used as a preventive bio-fungicide. Treat seeds, enrich compost and apply to soil, or dip seedling roots before transplanting. Use it with organic matter, avoid mixing with strong chemicals, and keep soil moist. When used properly, Trichoderma reduces soil-borne diseases, improves root health, and supports sustainable farming with healthier soil.
