Author
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Brodie, Bill |
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Submitted to: Journal of Nematology
Publication Type: Abstract Only Publication Acceptance Date: 8/5/1995 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Populations of Globodera rostochiensis that occur in New York are considered to consist solely of pathotype Ro1. Resistance to Ro1 is controlled by the single dominant gene H1 that has been bred into several commercial potato cultivars. Since the early 1980's, cultivars with the H1 gene have been grown repeatedly in G. rostochiensis-infested soils of New York. These cultivars annually reduce population densities of Ro1 by 90% or more, resulting in nematode densities in infested fields below detection levels after 2-4 years. Several cysts of Globodera spp. with viable eggs were recently recovered from a field in Long Island and at the golden nematode research farm in Steuben Co., NY where potato cultivars carrying the H1 gene were planted 6 or more years. Nematodes from these cysts reproduced equally as well on cultivars with the H1 gene as on Ro1 susceptible cultivars whereas pathotype Ro1 reproduced only on susceptible cultivars. These data indicate that a pathotype of potato cyst nematode other than G. rostochiensis Ro1 occurs in these fields. The identity of this pathotype is being investigated. |
