A COMPENDIUM OF TROPICAL PLANT DISEASES AND DISORDERS
ALTERNARIA AND CLOSELY RELATED FUNGI
SYMPTOMS
Spots of different sizes scattered across leaves
Spots can have a reddish, purple, or yellow border (halo)
Spots on leaves mainly but can occur on flowers and stems
Alternaria, Bipolaris, Corynespora, Drechslera, Exserohilum, Helminthosporium, and Stemphylium . These fungi form dark- colored spores with more than one cell. This results in causing very similar diseases in similar ways. They can all be controlled with the same range of fungicides. They are common on some crops grown in greenhouses, nurseries, and landscapes.
FAVORABLE CONDITIONS
Overhead irrigation or exposure to rainfall
Poor air circulation
Temperatures in the mid 70’s to low 80’s
ALOE ALTERNARIA
EXSEROHILUM PALM
SEDUM ALTERNARIA
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BROMELIAD BIPOLARIS
CORDYLINE BIPOLARIS
STRELITZIA BIPOLARIS
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