National Clean Plant Network
National Clean Plant Network
National Clean Plant Network
University of California
National Clean Plant Network

NCPN Newsletters

NCPN Network News

Fiscal Year 2021 Open Period

NCPN Open Period

NCPN provides high quality asexually propagated plant material tested for targeted plant pathogens and pests to protect the environment and ensure the global competitiveness of specialty crop...

International Year of Plant Health

IYPH2020 Logo Vertical  EN

The United Nations declared 2020 as the International Year of Plant Health (IYPH). Please join us in this once-in-a-lifetime opportunity and help protect the world's crops, forests, gardens, and...

NCPN Grape News

NCPN Hops News

Field Guide Integrated Pest Management in Hops

Start clean by purchasing virus tested hops for your yard and stay clean by following best management practices outlined in the link below.

Tips for Managing Hop Viruses in the Field

Plant with propagation material that is virus indexed. Destroy and replace diseased plants with virus-indexed plants as soon as possible to limit spread. Start work in virus-indexed yards before...

NCPN Berries News

  • Five Tips for Safeguarding Berry Farms from Virus Disease

    Plant resistant varieties where available. Never propagate from material that has not been virus-tested. Know the viruses that circulate in your area and their vectors. Never plant in fields...

  • Berries, NCPN Network News, Spring 2017

    John Clark

    John R Clark, Distinguished Professor, University of Arkansas “Back in the early to mid-2000s, two major developments occurred that impacted blackberry production, particularly in the South...

NCPN Roses News

  • Article available: What is Rose Rosette Disease?

    New open access article on RRD published by HortScience: What is Rose Rosette Disease?  

  • Rose Rosette Disease Video Available

    View the 'What Wednesday' video clip on Rose Rosette disease: TXPlantClinic/videos/ 10154736863317558/   Are you aware there is a website dedicated to Rose Rosette...

NCPN Citrus News

Joint Conference of the International Organization of Citrus Virologists XXI and the International Research Conference on Huanglongbing

Joint Conference of the International Organization of Citrus Virologists XXI and the International Research Conference on Huanglongbing   March 10-15, 2019 Riverside...

Dr. Georgios Vidalakis Awarded APS Excellence in Regulatory Affairs and Crop Security

Georgios Vidalakis, chair of NCPN-Citrus, has been recognized by the American Phytopathological Society for his outstanding contributions to regulatory plant pathology and crop security....

NCPN Sweet Potato News

NCPN-Sweetpotato Center Reports - December 2020

SP in field

Get all the latest news from the sweetpotato programs at Louisiana State University, North Carolina State University, and Mississippi State University.  

LSU AgCenter Sweet Potato Research Station Virtual Field Day


Get a first-hand look at the LSU AgCenter Virus-Tested Sweet Potato Program with Chris Clark and...

NCPN Fruit Tree News

Breeding for Disease Resistance

RosBREED is a national research and extension team focused on targeting breeding approaches in Rosaceae crops for disease resistance, horticultural quality and increased consumer satisfaction. Learn...

Five Tips for Preparing Fruit Tree Samples for Lab Virus Testing

Virus distribution changes with the seasons. In the winter, collect 8-10 inch one-year-old dormant bud sticks. In the summer collect flowers and leaf bud sticks from all major scaffolds and limbs....

NCPN LogoThe National Clean Plant Network (NCPN) produces and distributes asexually propagated plant material free of targeted graft transmissible plant pathogens to ensure the global competitiveness of specialty crop producers and to protect the environment. The NCPN operates under the auspices of three agencies within the United States Department of Agriculture - Animal and Plant Health Inspection Service (APHIS), Agricultural Research Service (ARS) and National Institute of Food and Agriculture (NIFA).



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