the fungal disease symptoms white, powdery spots may develop on leaves late in the growing season, leaves become chlorotic, then necrotic and all from the plant, severe defoliation may kill plants, seenhaigus, lehed kattuvad hallikasvalge jahutaolise kirmega, lehed hiljem pruunistuvad ja varisevad, nakatuvad ka varred ja õisiku rohelised osad, taime kasv kängub, õitsemine pidurdub