Black Leg of Canola (Brassica napus var. oleifera) in Kentucky

Mengistu, Ashenafi; Williams, Paul H.; Hershman, D. E.; Sippell, David W.

doi:10.1094/pd-74-0938c

Cited by 2 publications

(1 citation statement)

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“…Blackleg was first reported in 1989 in approximately 100 ha representing eight fields in south central Kentucky and was responsible for yield losses of up to 80%. Three isolates recovered from stubble collected from the Kentucky fields were from pathogenicity group (PG) 4 of the aggressive strain (16). During 1989 to 1991, disease surveys revealed that 13 of 37 fields, representing the bulk of rapeseed acreage in Kentucky, had blackleg.…”

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confidence: 99%

Assessment of Genetic Variation Among Leptosphaeria maculans Isolates Using Pathogenicity Data and AFLP Analysis

Pongam¹,

Osborn²,

Williams

1999

Plant Disease

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Increased production of rapeseed in the north central and southeastern regions of the United States has been accompanied by an increase in the incidence of blackleg disease caused by Leptosphaeria maculans. In order to assess the genetic variability and relatedness of isolates from these regions to others from around the world, we analyzed 49 aggressive isolates representing three pathogenicity groups (PG2, 3, and 4) of L. maculans from North Dakota, Georgia, Ontario, Western Canada, the United Kingdom (UK), France, Germany, and Australia using pathogenicity data and amplified fragment length polymorphism (AFLP). Approximately 10% of the 400 amplified fragments were polymorphic, scored as discrete characters and analyzed by cluster analysis. The isolates from North Dakota, Western Canada, Georgia, and PHW1252 from the UK formed one tightly clustered group and were mostly of the same pathogenicity group; whereas isolates from Ontario, Australia, France, Germany, and the remaining isolates from the UK formed a second group, which exhibited greater variation and consisted of three pathogenicity groups. The similarity between North Dakota isolates collected in 1995-96 and Western Canadian isolates collected in the 1980s suggests that L. maculans was introduced into North Dakota from Western Canada, and that the populations have remained relatively unchanged over the past 10 years.

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confidence: 99%