NY406 - Control of Downy Mildews in Nursery Seedlings

Downy mildew on seedlings (pansies, stocks and brassicas) is the major disease problem for Australia’s nursery industry, with losses estimated at $4 million a year This project, conducted from 1994 - 1997, developed management practices which have resulted in a 80-100% drop in the incidence of downy mildew on brassicas and a 100% drop on stocks in commercial nurseries in Victoria. Sales of stock seedlings have risen 30%. The report recommended management practices to reduce downy mildew: • controlled watering • ventilation • nutrition • hygiene • adopt fungicide protocols (when phosphonic acid is registered).