Department of Plant Pathology Plant Disease Facts

Gary Moorman
Professor of Plant Pathology

Maranta Diseases

Disease	Symptoms	Pathogen/Cause	Management
Cucumber Mosaic Virus	Leaves are small and distorted. Bright yellow line patterns form on the leaves	Cucumber mosaic virus	Destroy affected plants. Propagate from plants free of symptoms. Maintain good aphid control.
Helminthosporium Leaf Spot	Small water-soaked leafspots yellow and die. Spots merge and become large, irregular tan areas with a yellow halo.	Drechslera setariae (formerly Helminthosporium)	Avoid overhead watering. Apply chlorothalonil to protect healthy foliage.
Root Knot Nematode	Plants are stunted. Normally tuberous roots appear beaded and galled.	Meloidogyne	Discard infected plants. Or, take top cuttings and discard the roots and soil. Plant in pasteurized mix.
Tip Burn	Leaf tips and margins turn brown and die. There may be a yellow between the dead and live tissue.	Phosphate fertilizer or fluoride toxicity or high light intensity	Water and fertilize moderately. Avoid using superphosphate and perlite since they contain excessive fluoride.
Yellowing	Young leaves are yellowed.	Lack of fertilizer, iron deficiency	Maintain soil pH near 6. Use micronutrients or iron chelate to avoid iron deficiency.

COMMON NAME TRADE NAME

chlorothalonil Daconil 2787

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Last modified Tuesday, August 1, 2006