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Seminar: Stephen Ippolito: Weed Hosts for Guava Root Knot Nematode and Potential Herbicides for Use Post-transplant in Sweetpotato

April 29 | 9:00 am - 10:00 am

Date: Monday, April 29, 2024
Time: 9:00 am
Speaker:  Stephen Ippolito, PhD Introduction Seminar
Title: Weed Hosts for Guava Root Knot Nematode and Potential Herbicides for Use Post-transplant in Sweetpotato
Host: Dr. Katie Jennings

Location: 121 Kilgore / Hybrid
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Meeting ID: 940 3990 8453
Passcode: 802309

 Seminar_Stephen Ippolito_4.29.24.pdf


In the U.S. sweetpotato is an economically important crop with 133,000 acres planted in 2022. North Carolina is the leading producer of sweetpotato with more than 60% of the sweetpotato planted in the US in 2022. However, weed competition with sweetpotato can reduce yield and leave it susceptible to infection from pathogens and insect pressure. With a prostrate growth pattern, sweetpotato is particularly susceptible to competition for light with large broadleaf weeds such as Palmer amaranth. Meyers et al. (2010) reported as high as 81% marketable yield loss from competition with Palmer amaranth. In addition, greenhouse research conducted by Schwarz et al. (2023) reported many weed species including Palmer amaranth acting as hosts for Guava root knot nematode.

Guava root knot nematode (GRKN) is an emerging pest in North Carolina. Reported GRKN infestation has increased from its initial reporting in 2011 in NC. GRKN can severely impact sweetpotato yield and quality. In addition, it is known for its aggressive nature having a wide variety of hosts, and having overcome resistance genes such as those for southern root-knot nematode.

The addition of herbicides with alternative modes of action can help mitigate weed competition with sweetpotato as well as reduce selection pressure for herbicide resistance in weed populations. In addition, reducing weed populations may also help to prevent weeds from acting as a host for GRKN. To further examine the role of weeds as a potential host for GRKN weed samples will be collected from commercial fields with suspected or confirmed GRKN.


April 29
9:00 am - 10:00 am
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Rachel McLaughlin
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121 Kilgore Hall
2721 Founders Drive
Raleigh, NC 27606 United States
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