Chemical control Best used with cultural controls. Tank-mix and/or alternate products with different modes of action to prevent the buildup of resistant fungi.
Cause Pseudomonas cichorii, a bacterium. Warm, humid conditions such as frequent misting favor disease development on schefflera. Older, more mature leaves are more susceptible. The bacterium can survive on a wide range of host plants including many ornamentals, flowering plants, and vegetables.
Cause Phytophthora cinnamomi, a water-mold, fungus-like microorganism. The disease is favored in potted plants on plastic sheets, which hold water around the pots. The disease can spread when the sheets are used under other pots. This microorganism survives as oospores or chlamydospores in plant debris such as rotted roots or foliage. Spores may be moved long distances in contaminated soil or through moving water.
Fine roots rot away and a cinnamon-brown color advances up into the root crown. Above-ground symptoms vary.
