Optimum conditions for this fungal pathogen are saturated growing media and higher temperatures.

Contaminated irrigation water can disperse the pathogen.

Prevention is the key to management because the disease is difficult to suppress once it develops.

Start with a clean soilless growing medium and avoid contaminating the medium with soiled hands, tools or containers.

Promptly remove diseased plants, avoid splashing water during irrigation and keep hose ends off of the floor.

The best means of control is with drenches of systemic fungicides that move up into the crown area of the plant.

Even healthy-looking plants may be infected, so follow strict sanitation practices after an outbreak.

For additional information on the biology and management of diseases of greenhouse floral crops including Phytophthora Root and Stem Rot link to Cornell University Pest management Guidelines.