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Pansy > Leaves > Leaves discolored brown to black

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Credit: Michelle Grabowski, University of Minnesota Extension
Credit: Gerald Holmes, Valent USA Corporation, Bugwood.org
Credit: Michelle Grabowski, University of Minnesota Extension
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Root Rot
Pythium spp., Rhizoctonia solani, Thielaviopsis basicola

Leaves turn yellow to tan and wilt
Plants may be stunted
The base of the stem may turn brown and crack
Roots have brown to black sunken areas and lack root hairs
The outer root tissue may be easily removed leaving behind thin, stringy root cores
Lab test necessary to determine which pathogen is causing root rot
More information on Pythium root rot
More information on Rhizoctonia root rot
More information on Thelaviopsis root rot

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Credit: Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org
Credit: R.K. Jones, North Carolina State University, Bugwood.org
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Gray Mold
Botrytis cinerea

Brown spots or blotches on leaves or stems
Brown spots or blotches on flowers; flowers drop off prematurely
As disease progresses, entire leaves, flowers and shoots turn brown
Gray fuzzy mold develops on rotted tissue under humid conditions
Disease develops during cool, wet weather
More information on Gray Mold

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Credit: Karen Rane, University of Maryland
Credit: Karen Rane, University of Maryland
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Anthracnose
Colletotrichum violae-tricoloris

Tan to gray spots with dark margins on leaves
Leaf spots may develop concentric rings like a bull’s eye as they grow larger
Sunken brown to tan spots on stems
Brown spotting may occur on flower petals
More information on Anthracnose

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