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Carrot black rot

Scientific Name
Alternaria radicina
Scientific Author
(Meier) Drechsler & E.D. Eddy
Taxonomy
(Deuteromycotina: Hyphomycetales: Dematiaceae)
Status
Exotic Species Occurrence in Australia
Reliability
High
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Commodity Type

  • Fresh Roots
  • Fresh Stems
  • Fresh Vegetables
  • Leaves

Description

Recent research in Australia has shown that all isolates of A. radicina recovered from field-grown carrot seedlings were pathogenic, but they varied in virulence when tested with two different methods Also the pathogenicity varied depending on the location of the carrot growing region from where the isolate was obtained. For example, where carrot discs were used to test pathogenicy of A. radician, those isolated from roots were more virulent than those from petioles and seed. A. radicina isolates obtained seedling roots caused severe necrosis to 6-8-week-old seedlings roots (Coles and Wicks, 2003).

Carrot cultivars resistant to A. radicina infection can provide improved control for the management of Alternaria. Studies in Europe, Asia and America have identified resistance in Amarak, Berlikum and the Imperator, nantes and Chantenay-type carrots (Pryor et al., 2000). In America commercial hybrid cultivars showing the highest resistance to artificial crown infection were the Imperator Nantes types: Caro-pack, Gladiator, Panther, Carospike, Six-pack and Jaguar. However, previous Russian research had shown that no carrot cultivars were immune to infection by Alternaria spp., (Vlasova et al., 1988). In Australia no carrot cultivars are resistant to infection, some of the more resistant varieties are the smaller types: All seasons, Amsterdam and Golfball types which fit the Paris Market and Amsterdam Forcing cultivars. The more susceptible varieties, often grown commercially are Nantes, Danvers and Carrisma (Coles et al., 2003).

 

 


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