Agar transfers — when do you need to do them and why?

Four main reasons to use agar: 1) Genetic selection — you can visually select rhizomorphic versus tomentose mycelium and pick the sectors that look most vigorous. 2) Contamination screening — agar makes contamination visible before it spreads to expensive grain jars. 3) Cloning — you can take a tissue sample from a mushroom you like and culture it on agar before moving to grain. 4) Multispore reduction — spore syringes contain many genetic variants; agar allows you to isolate and work with single genetic lines.

When you don't need agar: if you're just doing basic PF Tek or Uncle Ben's Tek with commercial spore syringes and you're happy with your results — skip agar. It adds complexity, requires more equipment (still air box or flow hood), and the ROI is only there if you're doing genetics work or scaling up production. Most home hobbyists don't need it until they want to get more serious about strain development.

The practical starting point for agar: MEA (malt extract agar) at 15g malt + 500ml water + 7g agar is standard. Pressure cook 20 minutes at 15 PSI. Pour into plates while liquid in a still air box. Let cool and solidify completely (2–3 hours). For transfers: a small wedge of healthy mycelium from one plate, transferred to a fresh plate in the SAB with a sterilized scalpel. Sounds complex but becomes routine quickly.