Authors: Brian Hudelson, UW-Madison Plant Pathology
Last Revised: 04/15/2021
X-number: XHT1283
​

	Powdery Mildew Hosts:    Herbaceous and woody ornamentals, fruits, vegetables Pathogens:    Miscellaneous powdery mildew fungi Signs/Symptoms:  Powdery white growth on leaves For more information see:        UW Garden Facts XHT1005a/b/c
	Tar Spot Hosts:   Maples Pathogen:   Rhytisma spp. Signs/Symptoms:  Tarry areas (either solid spots or clusters of small spots) on leaves For more information see:        UW Garden Facts XHT1126
	Peach Leaf Curl Hosts:   Peach Pathogen:   Taphrina deformans Signs/Symptoms:  Light-green, yellow or purplish-red puckered areas on leaves For more information see:        UW Garden Facts XHT1069
	Sooty Mold Hosts:   Any plant Pathogen:   Miscellaneous sooty mold fungi Signs/Symptoms:  Powdery black growth on leaves or needles For more information see:        UW Bulletin A2637
	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
	Gymnosporangium Rusts Hosts:   Juniper, apple, crabapple, hawthorn, quince Pathogen:   Gymnosporangium spp. Signs/Symptoms:  Brown blobs with orange gelatinous masses (juniper); yellow/orange leaf spots (other hosts) For more information see:        UW Garden Facts XHT1009
	Black Knot Hosts:   Prunus spp. (plum and cherry) Pathogen:   Apiosporina morbosa Signs/Symptoms:  Black poop-like growths on branches For more information see:        UW Garden Facts XHT1056
	Elderberry Rust Hosts:   Elderberry Pathogen:   Puccinia sambuci Signs/Symptoms:  Light yellow, powdery growths on branches For more information see:        UW Garden Facts XHT1280
	Golden Canker Hosts:   Pagoda dogwood Pathogen:   Cryptodiaporthe corni Signs/Symptoms:  Gold-colored branches with orange spots For more information see:        UW Garden Facts XHT1125
	Dog Vomit Slime Mold Hosts:   Any plant and on mulch Cause:   Fuligo septica Signs/Symptoms:  Scrambled egg-like masses on mulch or at the base of plants For more information see:        UW Garden Facts XHT1091

For more information on common plant diseases: Contact your county Extension agent.