Publication Date
1993
Description
Small plots of 3 different mixtures of Stylosallllles. scabra genotypes were established within background paddocks of either pure cv. Seca, or a mixture of 6 S. scabra genotypes including Seca, to study anthracnose development in the three mixtures under exogenous inoculum pressures arising from the two backgrounds. There was no difference in disease severity between the background paddocks after the first year. In the small plots, severity of nearest neighbours significantly influenced anthracnose severity on the partially resistant accession 55860 in the first year; this effect disappeared as the disease became more widespread throughout the plot in later years. Replacing the susceptible Fitzroy with the more resistant assession 93116 in a mixture resulted only in a 7-19% improvement in disease ratings of individual accessions common to the three mixtures. These results confirm earlier findings that mixtures with components which do not discriminate between pathogen races do not effectively reduce anthracnose.
Citation
Chakraborty, S; Petitt, A N.; Boland, R M.; Choy, S Low; Cameron, D F.; Irwin, J A.G; and Davis, R D., "Stylo Host Heterogeneity for Anthracnose Management" (2024). IGC Proceedings (1993-2023). 10.
https://uknowledge.uky.edu/igc/1993/session22/10
Included in
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Stylo Host Heterogeneity for Anthracnose Management
Small plots of 3 different mixtures of Stylosallllles. scabra genotypes were established within background paddocks of either pure cv. Seca, or a mixture of 6 S. scabra genotypes including Seca, to study anthracnose development in the three mixtures under exogenous inoculum pressures arising from the two backgrounds. There was no difference in disease severity between the background paddocks after the first year. In the small plots, severity of nearest neighbours significantly influenced anthracnose severity on the partially resistant accession 55860 in the first year; this effect disappeared as the disease became more widespread throughout the plot in later years. Replacing the susceptible Fitzroy with the more resistant assession 93116 in a mixture resulted only in a 7-19% improvement in disease ratings of individual accessions common to the three mixtures. These results confirm earlier findings that mixtures with components which do not discriminate between pathogen races do not effectively reduce anthracnose.
