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Cercospora Leaf Spot — Cercospora spp.

Spotlight Name Archive: Leaf Spots

Spotlight Header Archive: Disease Diagnostics Photo Library

Host: Cordyline, dracaena, ficus, hosta, hydrangea, pansy, pittosporum, succulents
Symptoms: Cercospora leaf spot on some foliage plant hosts appears as tiny, slightly raised red or dark green spots that appear on the lower leaf surfaces. On Ti plants rust-colored specks form initially then enlarge into elliptical areas up to 7 mm across and turn tan to brown in color. On pansies, small purplish spots enlarge into conspicuous black spots with fringed margins 1/4 inch or more in diameter. Other symptoms include angular leaf spot.
Conditions Favoring Disease: Cercospora leaf spot is associated with heavy rainfall or with the use of overhead irrigation.
How Pathogen Survives/Disperses: Spores are spread by splashing water. Extended periods of leaf wetness allow spores to germinate and infect the foliage.
Photo and write up provided by Syngenta Professional Products

from Syngenta Horticultural Services




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