Tar Spot of Corn: A Diagnostic and Methods Guide

José E. Solórzano, C. D. Cruz, Brett E. Arenz, Dean K. Malvick, Nathan M. Kleczewski

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Tar spot of corn is an emerging plant disease in the continental United States and Canada caused by the fungal pathogen foliar Phyllachora maydis Maubl. Tar spot has been known to occur in Mexico, the Caribbean, and Central and South America since the early to mid-1900s. In 2015, it was reported for the first time in the continental United States. Since that time, tar spot has spread across corn-producing areas in the United States with spread across corn-producing areas in the United States with spread across corn-producing areas in the United States with century in the Americas, the biology of the pathogen, etiology, and epidemiology of the disease are not well understood. Additionally, symptoms and signs of tar spot resemble other diseases and abiotic disorders of corn, which may lead to misdiagnosis. In this paper, we provide a brief description of current knowledge about tar spot of corn, including pathogen current knowledge about tar spot of corn, including pathogen has pathogenicity testing, diagnostic protocols, and geographic distribution. This information will be useful to diagnosticians, researchers, and other professionals working with this disease.

Original languageEnglish (US)
Pages (from-to)117-122
Number of pages6
JournalPlant Health Progress
Volume24
Issue number1
DOIs
StatePublished - 2023

Bibliographical note

Funding Information:
The authors acknowledge Dr. Martin Chilvers (Michigan State University) for providing comments for this diagnostic guide and the Minnesota Invasive Terrestrial Plants and Pests Center for supporting this work.

Publisher Copyright:
© 2023 The American Phytopathological Society

Keywords

  • diagnostics
  • maize
  • molecular
  • Phyllachora maydis
  • signs
  • symptoms

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