Mycoscience

, Volume 36, Issue 3, pp 257–261 | Cite as

Alternaria on cruciferous plants. 4.Alternaria species on seed of some cruciferous crops and their pathogenicity

  • Akira Tohyama
  • Mitsuya Tsuda
Original Papers

Abstract

The incidence ofAlternaria spp. on seed samples of cruciferous vegetable crops was surveyed between 1990 and 1992. Some commercial seed lots of crucifers which are commonly grown in Japan were infested withAlternaria species. ThreeAlternaria species were encountered on the seed samples ofBrassica campestris, B. orelacea, andRaphanus sativus. The most frequently detected species wereA. japonica andA. alternata onB. campestris, A. brassicicola onB. oleracea, andA. japonica andA. alternata onR. sativus, respectively.Alternaria brassicae was not detected in this study.Alternaria brassicicola isolates from these crops produced necrotic lesions on all of the crucifer seedlings inoculated, whileA. japonica induced different reactions in different plants or plant parts depending on isolates used in inoculation tests. In contrast, most isolates ofA. alternata could not produce necrotic lesions on foliage leaves of crucifers inoculated, although some of them produced clear lesions only on cotyledons.Alternaria alternata associated with these cruciferous crop seeds was considered to be an oppotunistic parasite of these crops.

Key Words

Alternaria alternata Alternaria brassicicola Alternaria japonica pathogenicity seed pathology 

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Copyright information

© The Mycological Society of Japan 1995

Authors and Affiliations

  • Akira Tohyama
    • 1
  • Mitsuya Tsuda
    • 2
  1. 1.Agronomy DivisionShiga Junior CollegeShigaJapan
  2. 2.Pesticide Research InstituteKyoto UniversityKyotoJapan

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