The role of seed infection in the spread of blackleg of rape in Western Australia

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Abstract
A survey of rapeseed [Brassica napus, B. campestris] crops in Western Australia for blackleg (Leptosphaeria maculans (Desm.) Ces and de Not) infection was conducted in Nov. 1972. No correlation between levels of pod infection in Nov. and seed infection at maturity was established. An in vitro test showed that 67% of L. maculans infected seeds gave rise to seedlings with one or both cotyledons infected. Under field conditions in 1974, a plot grown from 5.9% infected seed resulted in 19.0% of plants developing blackleg crown cankers, whereas a plot containing 0.08% infected seed gave 1.1% of plants infected. The following year at a different location, a sample assessed at 0.5% infection produced only 0.06% of plants with crown cankers, and 0.08% infected seed yielded 0.08% infected plants.

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