Skip to content
IR4 Home Page
  • About IR-4
    • Annual Reports
    • Careers
    • Contacts
      • Headquarters Staff
      • National Directory
      • Regional Field Coordinators
    • History
    • Mission & Vision
    • News
    • Outreach
    • Participants in the Process
  • Food Crops
    • Biopesticide Regulatory Support Program
    • Crop Grouping
    • Integrated Solutions
    • International Programs
    • Residue and Product Performance
  • Environmental Horticulture
  • Events & Training
  • Stakeholder Resources
    • Database: Food Crops
    • eQA/eDOCs
    • Database: Environmental Horticulture
    • Databases: Biopesticides and Organic Support
    • Glossary of Acronyms
    • Upload Files
  • Submit a Project Request

New Tool Identified in Fight Against Fungal Disease on Pomegranates

Posted on January 26, 2022January 26, 2022 — Jennifer Heiss

Merivon approved for use on pomegranate. Label to be released in California and Florida in 2022.

The production of pomegranates is increasing globally. While India is the largest producer of this fruit, the pomegranate shrub or tree can be grown in any tropical to temperate climate. In the United States, approximately 90 percent of commercially grown pomegranates are produced in California.

Historically, no fungicides were available to growers specifically for use on pomegranates. Thanks to research funded by the IR-4 Project, pomegranate growers in California and Florida will soon be able to use Fluxapyroxad + Pyraclostrobin, manufactured by BASF and sold as Merivon® Xemium® Brand Fungicide, to reduce disease on this popular fruit.

Domestic Production and Disease
California pomegranate growers have mostly favorable weather conditions to grow their crops; however, they still face diseases such as black heart and Botrytis gray mold.

Two pomegranates: one whole and one cut in half, displaying black heart damage on the inside of the fruit
Alternaria spp. cause black heart in pomegranates grown in California. Photo courtesy of Dr. Themis Michailides, University of California.

“The main pathogens that infest pomegranate are Alternaria spp., including A. alternata and other Alternaria species that are mainly responsible for black heart in the fruit,” said Dr. Themis Michailides, plant pathologist at the University of California Division of Agriculture and Natural Resources, Kearney Agricultural Research and Extension Center. “Other pathogens that can cause problems include Aspergillus niger and Botrytis cinerea.” 

In the southeast, commercial pomegranate production is not common due to fungal disease that can spread easily in the local climate, such as Anthracnose, which causes fruit rot. However, home gardeners in Florida have grown pomegranate trees in their yards for years. 

Identifying a Solution
With funding from the IR-4 Project, Michailides conducted successful trials to study the effectiveness of Merivon on controlling pomegranate black heart caused by Alternaria. 

The trials took place at the Kearney Agricultural Research and Extension Center and at Wonderful Orchards, a commercial pomegranate grower in Shafter California that has been a supporter of research on this crop. 

“Although California doesn’t have an organized pomegranate grower association, we had requests from other growers who were interested in controlling black heart disease. Wonderful Orchards was very cooperative and provided the sprayer to apply the fungicide for the studies,” said Michailides.

Green pomegranate fruit with visible rotting
Anthracnose on pomegranates is caused by Colletotrichum spp., which attacks the fruit and results in rot. Photo courtesy of K.V. Xavier, University of Florida.

In Florida, Dr. Gary Vallad, professor of plant pathology at the University of Florida, conducted trials at grower locations where trees had grown for several years before they produced sufficient fruit. Merivon proved to be effective in controlling Anthracnose in these trials.

Data collected in these studies ultimately led to the U.S. Environmental Protection Agency approving Merivon for use on pomegranates in July of 2021. BASF expects to release the updated label for use in California in time for the 2022 growing season, pending approval from the California Department of Pesticide Registration. BASF is also submitting the label for use in Florida in 2022. Users should ensure that the product is registered for use on pomegranates in their state before proceeding with application.

About the IR-4 Project
The mission of the IR-4 Project is to facilitate regulatory approval of sustainable pest management technologies for specialty crops and specialty uses to promote public well-being. By working directly with local crop growers across the country, IR-4 conducts research and develops data necessary for the registration of pest management tools, ensuring that they are safe for use. To learn more, visit our website at ir4project.org. 

Posted in Food Use, News, Success Story
About
About IR-4
Annual Reports
Careers
Contacts
Headquarters Staff
Field Research Directors
National Directory
Project Management Committee
Regional Field Coordinators
Regional Laboratory Coordinators
State Liaison Representatives
QA Personnel
History
Mission & Vision
News
Outreach
Participants in the Process
Commodity Liaison Committee
Crop Protection Industry
Canadian Partners
Recent posts
  • New Hire at HQ: Josh Kindel, Environmental Horticulture Program Manager May 13, 2025
  • IR-4 Leaders Recognized With NC State Awards May 7, 2025
  • Vision-Guided Spraying Technology Targets Problem Weeds April 16, 2025
  • The IR-4 Project Inducts Dan Rossi into the Hall of Fame March 27, 2025
  • 2024 IR-4 SOAR Award Recipients (Part 2) March 19, 2025

IR-4 Project Headquarters
NC State University
1730 Varsity Drive
Venture IV, Suite 210
Raleigh, NC 27606
(919) 515-1552
ir-4_project@ncsu.edu

  • Upload Files
  • About IR-4
  • Contacts
  • Sign Up for Announcements
  • Facebook
  • Twitter
  • LinkedIn
  • YouTube

This website is based upon work that is supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, under award numbers 2022-79111-38469 and 2021-34383-34848 with substantial cooperation and support from the State Agricultural Experiment Stations, USDA-ARS, USDA-APHIS, and USDA-FAS. In accordance with Federal Law and U.S. Department of Agriculture policy, this institution is prohibited from discriminating on the basis of race, color, national origin, sex, age or disability.

NC State University promotes equal opportunity and prohibits discrimination and harassment based upon one’s age, color, disability, gender identity, genetic information, national origin, race, religion, sex (including pregnancy), sexual orientation and veteran status.

  • About IR-4
    ▼
    • Annual Reports
    • Careers
    • Contacts
      ▼
      • Headquarters Staff
      • National Directory
      • Regional Field Coordinators
    • History
    • Mission & Vision
    • News
    • Outreach
    • Participants in the Process
  • Food Crops
    ▼
    • Biopesticide Regulatory Support Program
    • Crop Grouping
    • Integrated Solutions
    • International Programs
    • Residue and Product Performance
  • Environmental Horticulture
  • Events & Training
  • Stakeholder Resources
    ▼
    • Database: Food Crops
    • eQA/eDOCs
    • Database: Environmental Horticulture
    • Databases: Biopesticides and Organic Support
    • Glossary of Acronyms
    • Upload Files
  • Submit a Project Request