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This project commenced in May 1981 primarily to identify sources of resistance to clover scorch (Kabatiella caulivora), root rots (Pythium, Fusarium and Rhizoctonia spp.), and bluegreen aphid (Acyrthospihon kondoi) in the National Subterranean Clover Collection. Screening for resistance to red legged earthmite (Halotydeus destructor) was initiated part way through the project. Since commencement approximately 5,250 introductions and crossbred clover shave been tested for resistance to clover scorch, 420 for resistance to rootrots, 690 for resistance to blue green aphid and 160 for resistance to redlegged earth mite (R.L.E.M.). A large number of clovers possessing resistance to clover scorch have been identified. Approximately 13% of the introductions tested have scored 3.0 or less (0-10 increasing disease scale) indicating good resistance to clover scorch while the proportion of crossbred clovers with resistance has averaged33%. This indicates the considerable success being achieved in breeding for clover scorch resistance using parent lines previously identified in this programme.

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Western Australia, Farming Systems