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Summary — The intergenotypic interactions for the spread and development of natural brown rust infection in components of Kalyansona multiline wheat MLKS-11 were studied using an alternate row design. The results showed no evidence of an escape mechanism due to the shielding of the susceptible components by the resistant lines during the onset of the disease. However, there were indications of barrier effects of resistant genotypes in which these genotypes, apart from being noncontributory, slowed down the disease development in susceptible host components. The intergenotypic effects between the susceptible components themselves, or with the other susceptible lines significantly increased brown rust infection. The susceptible lines were more infected by the pathogen when they were bordered by the same lines or other susceptible host genotypes showing similar reactions to a virulent race of the pathogen. The need for an allelism test for different Lr gene(s) using artificial inoculations or the use of field designs such as alternate row design to elicit information on interactions for disease development before constituting a multiline has been highlighted in the results.

Patterns of brown rust development in eight wheat multiline components using alternate row design