Author
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Brodie, Bill |
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Submitted to: Nematropica
Publication Type: Abstract Only Publication Acceptance Date: 7/7/1996 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: A population of potato cyst nematodes (PCN) was found in Steuben County, NY that multiplied freely on potato plants (cv. Hudson) with the H1 gene that confers resistance to Globodera rostochiensis pathotype Ro1. This variant population of PCN was found in an area of the golden nematode research farm where Ro1 resistant cultivars had been grown repeatedly the past eight years. Morphometric measurements, cyst color sequence, and DNA analysis identified the population as belonging to the species G. rostochiensis rather than G. pallida. Tests with differential hosts indicated that the population consisted of G. rostochiensis pathotype Ro2. Fields in which Ro1 resistant potato cultivars had been grown three or more successive years were surveyed for the presence of viable eggs of G. rostochiensis. Cysts with viable eggs were recovered from four fields in Suffolk County, NY (Long Island) and one additional field in Steuben County, NY. Nematodes from cysts that were recovered from two of the fields on Long Island were found to multiply freely on Ro1 resistant plants. Although one or more cysts developed on Ro1 resistant plants that had grown in soil from the other three fields, it was not certain if these cysts represented a pathotype of PCN that overcomes Ro1 resistance. |
