Abstract
Abstract The extent of seed transmission of dry-rot was assessed over a period of three years by sowing seed lines with known levels of infection and noting the amount of dry-rot which subsequently developed in each line. If weather conditions were wet after sowing, transmission of the disease occurred from seed with an infection of 0.5 per cent; but in a dry season a level as high as 3.0 per cent gave no transmission. As the infection in most commercial seed sown in New Zealand has been shown rarely to exceed 0.1 per cent, it is concluded that the annual recurrence of this disease in swede-growing areas is not caused by seed infection. This is regarded as strong circumstantial evidence that air-borne ascospores originating from old brassica crop residues are the chief agents of primary infection in the majority of swede crops in New Zealand. Laboratory trials showed that infection of brassica seed by Leptosphaeria maculans (Desm.) Ces. & de Not. (Phoma lingam) could be greatly reduced by seed treatment w...
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