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Septoria Leaf Spot and Early Blight Host: Tomato Pathogens: Septoria lycopersicia and Alternaria solani Signs/Symptoms: Spotting and eventual total collapse of leaves working from the bottom of the plant up For more information see: UW Garden Facts D0100/D0046 |
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Late Blight Hosts: Tomato, potato Pathogen: Phytophthora infestans Signs/Symptoms: Water-soaked spots on leaves, leathery areas on tomato fruits, rapid plant death For more information see: UW Garden Facts D0068 |
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Blossom End Rot Host: Tomato, pepper, eggplant, cucumber, squash Cause: Calcium deficiency Signs/Symptoms: Decayed areas on the bottom sides of vegetable fruits For more information see: UW Garden Facts D0022 |
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Powdery Mildew Hosts: Any vegetable, particularly vine crops, peas Pathogens: Miscellaneous powdery mildew fungi Signs/Symptoms: Powdery white growth on leaves For more information see: UW Garden Facts D0086 |
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Common Corn Smut Hosts: Corn Pathogen: Ustilago maydis Signs/Symptoms: Pasty white masses on corn ears eventually decomposing into a brown powder For more information see: UW Garden Facts D0031 |
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Black Rot Hosts: Crucifers (e.g., cabbage, broccoli, cauliflower) Pathogen: Xanthomonas campestris pv. campetris Signs/Symptoms: V-shaped yellow/dead areas on leaves progressing into plant deterioration and death For more information see: UW Garden Facts D0019 |
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Potato Scab Hosts: Potato, carrot, beet, other root crops Pathogen: Streptomyces scabies Signs/Symptoms: Brown, rough, scab-like areas on tubers and roots For more information see: UW Garden Facts D0083 |
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Verticillium Wilt Host: Tomato, pepper, eggplant, potato, vine crops Pathogen: Verticillium spp. Signs/Symptoms: Leaf yellowing and wilting of plants followed by eventual plant death For more information see: UW Garden Facts D0122 |
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Aster Yellows Hosts: Carrot Pathogens: Aster yellows phytoplasma Signs/Symptoms: Yellow/orange/purple leaves, stunted roots with tufts of white hairy roots For more information see: UW Garden Facts D0007 |
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Bacterial Wilt Hosts: Vine crops Pathogen: Erwinia tracheiphila Signs/Symptoms: Sectional wilting and eventual death of plants after cucumber beetle feeding For more information see: UW Garden Facts D0014 |
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Basil Downy Mildew Host: Basil Pathogen: Peronospora belbahrii Signs/Symptoms: Downward-cupped, yellow leaves with purple-gray fuzz on leaf undersurfaces For more information see: UW Garden Facts D0015 |
For more information on vegetable diseases:
See https://pddc.qa.webhosting.cals.wisc.edu/ or contact the University of Wisconsin Plant Disease Diagnostics Clinic (PDDC) at (608) 262-2863 or pddc@wisc.edu.
© 2021-2024 the Board of Regents of the University of Wisconsin System doing business as University of Wisconsin-Madison Division of Extension.
An EEO/Affirmative Action employer, University of Wisconsin-Madison Division of Extension provides equal opportunities in employment and programming, including Title IX and ADA requirements. This document can be provided in an alternative format by calling Brian Hudelson at (608) 262-2863 (711 for Wisconsin Relay).
Thanks to Jane Anklam, Vijai Pandian, and Linda Remeschatis for reviewing this document. Thanks also to Amanda Gevens (late blight, black rot, Verticillium wilt), ISU-PIDC (bacterial wilt) and Debbie Roos (basil downy mildew) for use of their photos.
A complete inventory of UW Plant Disease Facts is available at the University of Wisconsin-Madison Plant Disease Diagnostics Clinic website: https://pddc.qa.webhosting.cals.wisc.edu.
Submit additional lawn, landscape, and gardening questions at https://hort.extension.wisc.edu/ask-a-gardening-question/.