Hollyhock rust – Puccinia malvacearum
Print
EmailPathogen: Puccinia malvacearum
Hosts: Alcea, Althaea, Lavatera, and Malva.
Symptoms: Small brown spots develop on the underside of foliage. Raised, bright yellow or orange pustules are visible on the upper leaf surface. When disease is severe large portions of the foliage are killed.
Spread: Spores can over winter on diseased plant tissues infecting new foliage the following year. Spores are also produced on susceptible weeds these can subsequently infect and cause disease on hollyhocks. Spores are wind dispersed.
Management: Disease control on seedlings is especially important. Fungicide applications at regular intervals are necessary when disease is severe. Plants should be cut back as soon as flowering is done. Plant debris should be removed and destroyed, it should not be composted. Several weeds (in the mallow family) are also susceptible; these weeds should be controlled to limit inoculum in the growing area.
Other Documents in this Series
You Might Also Be Interested In
-
Celebrating 100 years of Michigan State University Extension in Alcona County
Published on October 19, 2017
-
MSU named Top 10 agriculture and forestry college in new report
Published on March 23, 2021
-
Protecting Michigan’s environment and wildlife through the Conservation Reserve Enhancement Program
Published on September 1, 2021
-
MSU to study precision livestock farming adoption trends in U.S. swine industry
Published on March 15, 2021
-
MSU Extension to undertake three-year, $7 million vaccination education effort
Published on August 17, 2021
-
Inspired and in-person: face-to-face programming returns for Michigan 4-H
Published on August 25, 2021
Accessibility Questions:
For questions about accessibility and/or if you need additional accommodations for a specific document, please send an email to ANR Communications & Marketing at anrcommunications@anr.msu.edu.