Host: Dizygotheca, Fatshedera spp., Fatsia, Polyscias spp.
(Aralia), schefflera Symptoms: This disease causes large,
irregularly-shaped dark-brown spots to form on the leaves of
plants and sometimes on their petioles and stems. Leaf drop
commonly occurs with severe infections, giving the foliage a
sparse appearance that is easily misdiagnosed as a symptom of
root rot. Conditions Favoring Disease: This disease is favored
by wet conditions and temperatures between 65° and 86°F. Severe
infections occur at temperatures between 75° to 80°F. How
Pathogen Survives/Disperses: The conidia of A. panax are carried
by splashing water from fallen leaves on the ground to leaves
several feet above the ground. Photo and write up provided by
Syngenta Professional Products