The efficiency of three fungicides, applyed as seed dressing, on the control of Helminthosporium sativum under laboratory conditions was evaluated wheat seeds, cultivar ?IAC-5 Maringá? were treated with the fungicides Baytan (Triadimenol), Benlate (Benomyl) and Sumilex (Procymidone) at 100g, 100g, and 200g, respectively, for each 100kg of seeds. The treated seeds were on water ? agar medium in Petri dishes and covered with a 2cm deep sand layer. Seedling height, H. sativum lesions, germination rates stem and leaves fresh weight and fungicides phytotoxicity were evaluated. Procymidone was the most effective on controling H. sativum and Benomyl was similar to the untreated control. Triadimenol, although e efficient in controlling infection, was shown to be phytotoxic, producing twisted, thickened and over ? developed leaves.