Effects of defoliation on black currant (Ribes nigrum l.) infection by Armillaria species

  • TOS Popoola Department of Horticulture and Landscape, School of Plant Sciences, University of Reading, TOB2, Earley Gate, Reading.RG6 2AU. UK
  • RTV Fox Department of Horticulture and Landscape, School of Plant Sciences, University of Reading, TOB2, Earley Gate, Reading.RG6 2AU. UK
Keywords: Defoliation stress, Armillaria spp, blackcurrant

Abstract

Field inoculation trials and laboratory studies were used to investigate the effects of defoliation stress on potted black currant plants and the infection by English and African isolates of Armillaria. Defoliation has varying effects on the carbohydrate, fatty acids and amino acids contents of roots. All isolates of Armillaria tested infected black currant plants irrespective of stress treatment; with two of the test isolates, more of the infected plants were killed with defoliation treatment. Media supplemented with water extract from defoliated roots stimulated growth of isolates compared to media supplemented with extract from non-defoliated control root tissues. The differences observed in the pathogenic behaviour of isolates, may be of importance in the epidemiology of Armillaria infections.

Key Words: Defoliation stress, Armillaria spp; blackcurrant

Moor J. Agric. Res. Vol.4(1) 2003: 111-117
Published
2004-11-22
Section
Articles

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eISSN: 1595-4153