Control of seed borne diseases in production of organic cereals.
A study was conducted to investigate the effect of combinations of hot- and warm-water treatments on control of Pyrenophora graminea and Ustilago nuda [U. segetum var. nuda] and on seed germination. The effect was also studied of treatments based on pH-effects using acetic acid. In spring barley, 5% acetic acid controlled P. graminea and adversely affected seed germination. Hot water treatment at 55°C gave good control of P. graminea. The effect of hot water was enhanced by pre-soaking seed in water at 20°. Seed pre-soaking at 45°, succeeded by short treatment in water at 50° controlled U. segetum var. nuda.