1 The consistent failure of fertilization or hyphal fusion between particular combinations of individual plants, algae, fungi etc. See self-incompatibility. 2 Interaction between stock and scion resulting in the failure of the graft either a immediately, leading to the rapid death of at least the scion, or b after some years of apparendy successful growth, resulting in fracture across the graft union. 3 The relationship between a plant and a pathogen to which the plant is not susceptible,

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