Authors: Brian Hudelson, UW-Madison Plant Pathology
Last Revised: 04/30/2021
D-number: XHT1190

	Anthracnose Hosts: Most trees, commonly ash, maple and oak Pathogens: Gloeosporium spp. as well as other fungi Signs/Symptoms: Blotchy dead areas on leaves For more information see:  UW Garden Facts XHT1001
	Purple-Bordered Leaf Spot Host: Amur, Japanese, red, silver and sugar maple Pathogen: Phyllosticta minima Signs/Symptoms: Discrete, circular leaf spots with purple borders For more information see:  UW Garden Facts XHT1149
	Tubakia (Actinopelte) Leaf Spot Hosts: Oak Pathogen: Tubakia spp. (Actinopelte spp.) Signs/Symptoms: Discrete circular, or irregular blotchy dead areas on leaves For more information see: UW Garden Facts XHT1104
	Apple Scab Hosts: Apple, crabapple, pear, mountain-ash Pathogen: Venturia inaequalis Signs/Symptoms: Circular, black leaf spots with feathery edges; eventual leaf loss For more information see: UW Garden Facts XHT1007
	Gymnosporangium Rust Hosts: Apple, crabapple, hawthorn Pathogens: Gymnosporangium spp. Signs/Symptoms: Bright yellow-orange, circular leaf spots For more information see: UW Garden Facts XHT1009
	Powdery Mildew Hosts: Most deciduous trees Pathogens: Several genera of powdery mildew fungi Signs/Symptoms: Uniform/blotchy powdery white areas on upper and lower leaf surfaces For more information see: UW Garden Facts XHT1005a
	Downy Leaf Spot Hosts: Hickory, walnut Pathogen: Microstroma juglandis Signs/Symptoms: Discrete powdery white areas on lower leaf surfaces
	Chlorosis Hosts: Oak, red maple Cause: Iron or manganese deficiency, often induced by high soil pH Signs/Symptoms: Yellow leaves with dark green veins For more information see: UW Garden Facts XHT1002
	Scorch Hosts: Most deciduous trees Cause: Water stress induced by drought, high soil salt content, or other water-limiting factors Signs/Symptoms: Dead tissue on leaf margins
	Tatters Hosts: Most deciduous trees, but commonly oak Cause: Possible early season cold injury Signs/Symptoms: Lacy, tattered-looking leaves For more information see: UW Garden Facts XHT1141

For more information on deciduous tree leaf diseases:  See https://pddc.wisc.edu/ or contact your County Extension agent.