Substrates and spawn preparation
- Grain spawn: Clean cereal grains like wheat, sorghum (jowar), rye, or bajra are boiled, mixed with calcium carbonate and gypsum, sterilized in autoclaves, and inoculated with pure fungal culture.
- Master spawn vs commercial spawn: Master spawn is prepared directly from pure test-tube cultures, while commercial spawn is multiplied from master spawn for distribution to growers.
- Sawdust spawn: Sterilized hardwood sawdust mixed with wheat bran, preferred for wood-decaying specialty mushrooms like shiitake.
Quality parameters and testing
Healthy spawn exhibits uniform, dense, silky-white mycelial growth permeating the grain carrier completely. Spawn bags showing green, black, or orange molds, excessive moisture, bacterial slime, or a sour foul odor must be discarded immediately to prevent contamination of cropping rooms.
Storage and handling guidelines
Fresh grain spawn should ideally be used within 2 to 3 weeks of full colonization. If storage is necessary, keep spawn in clean, refrigerated storage at 2°C to 4°C (never below freezing) to suspend metabolic activity without damaging mycelial vigor.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
ICAR - Directorate of Mushroom Research (DMR) ↗Related on KisanPe
Common questions
What is mushroom spawn?
Mushroom spawn is pure mushroom mycelium actively growing on a sterilized cereal grain substrate, used as seed for mushroom production.
How can a grower identify contaminated spawn?
Presence of green, black, or yellow mold patches, foul smelling exudate, or wet bacterial rot indicates contaminated spawn.
Where should farmers purchase reliable mushroom spawn?
Farmers should purchase spawn from certified laboratories of ICAR institutes, State Agricultural Universities, or accredited Krishi Vigyan Kendras.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
More Seeds, Crops & Cultivation guides
Ask Sakhi AI in your language, check live mandi prices or plan a loan with KisanPe tools.