Alternaria Leaf Spot — Alternaria panax

Spotlight Name Archive: Leaf Spots

Spotlight Header Archive: Disease Diagnostics Photo Library

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

(Visited 37 times, 1 visits today)
from Syngenta Horticultural Services




Latest Photos see all »

GPN recognizes 40 industry professionals under the age of 40 who are helping to determine the future of the horticulture industry. These individuals are today’s movers and shakers who are already setting the pace for tomorrow.

75 Applewood Drive, Suite A
P.O. Box 128
Sparta, MI 49345

616.887.9008
Get one year of Greenhouse Product News in both print and digital editions for free.
Preview our digital edition »

Interested in reading the print edition of GPN?

Subscribe Today »



Be sure to check
out our sister site.
website development by deyo designs