Summary
Incomplete resistance of the hybrid coffee population Icatu to race II of coffee leaf rust (Hemileia vastatrix) was studied in the field, greenhouse and laboratory. The resistance components observed were: latency period (LP), lesion density (LD), sporulating lesion density (LSD) and relative sporulation lesion efficiency (RSLE=100. SLD/LD). RSLE is an indicator for the heterogeneity of the reaction.
Disease score in the field was highly correlated with RSLE, less with LP and SLD, and not with LD. LP was highly correlated with RSLE.
A new rust race (Is. 2), isolated in the field from Icatu in 1979, was more virulent than race II on some resistant, moderately resistant or moderately susceptible genotypes. This indicates that incomplete resistance, at different levels, can be race specific.
Resistance was affected by leaf age and light intensity. Inheritance studies suggest that incomplete resistance in Icatu might be related to major genes, the effectiveness of which may depend on gene dose and genetic background.
It is concluded that selection for incomplete resistance to coffee leaf rust in Icatu may not lead to durable resistance.
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Eskes, A.B., Da Costa, W.M. 8. Characterization of incomplete resistance to Hemileia vastatrix in the icatu coffee population. Euphytica 32, 649–657 (1983). https://doi.org/10.1007/BF00021478
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DOI: https://doi.org/10.1007/BF00021478