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Disease Note. First Report of Globodera tabacum solanacearum on Flue-Cured Tobacco Outside Virginia. T. A. Melton, Department of Plant Pathology, North Carolina State University. J. A. Phillips, J. L. Imbriani, and K. R. Barker. Department of Plant Pathology, North Carolina State University; Agronomic Division, North Carolina Department of Agriculture; and Department of Plant Pathology, North Carolina State University, Raleigh 27695. Plant Dis. 75:1074. Accepted for publication 6 May 1991. Copyright 1991 The American Phytopathological Society. DOI: 10.1094/PD-75-1074B. Globodera tabacum solanacearum (Miller & Gray) was identified
in a diagnostic soil assay for nematodes in a flue-cured tobacco
(Nicotiana tabacum L.) field in Warren County, North Carolina. This
nematode was first found in Virginia in 1961 (2). Since then, the
nematode has been found exclusively in Virginia, causing extensive
damage in counties parallel to the North Carolina border (1). The
North Carolina soil sample from which the analysis was made represented
a field showing severe stunting. Since that time, 120 samples
from 15 different growers in Warren County, which adjoins Virginia,
have been analyzed. Twenty-two samples from four farms were positive
for G. t. solanacearum. Of these 22 positive fields, 21 were planted
to tobacco the previous year and one to soybeans. The average cyst
and juvenile population was 100/500 cm3 of soil, with a range of
10-342 (SD = 105). Identifications were based on female adults
removed from tobacco roots. G. t. tabacum is not known to occur
in North Carolina. |