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Summary: Leaves of C. sativa were highly resistant to A. brassicae. No disease was seen until leaves began to senesce after 6 days and then only as localized brown flecks after inoculation with 100-10000 conidia. Camelina sativa produced a phytoalexin even when very few conidia were deposited on leaves. The phytoalexin concentration increased with increasing inoculum until leaves started to senesce.