MSC Thesis-Incomplete Resistance to Coffee Leaf Rust-A.b Eskes 1983

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Date
1983
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Kenya Agricultural Research Institute
Abstract
Incomplete resistance to coffee leaf rust (Hemileia vastatrix) may be of value in obtaining durable resistance, which is of great importance for the perennial coffee crop. Methods were developed to assess incomplete resistance to coffee leaf rust by using illustrated scales ranging from ° to 9 (Chapter 1). A laboratory screening method, which uses leaf disks, has been standardized. The method is satisfactory for the assessment of complete and incomplete resistance (Chapter 2). Resistance to coffee leaf rust appeared to be affected by light intensity and leaf age (Chapters 3 and 4). In general, coffee leaves were more resistant under low than under high light intensities. The effect of leaf age varied with the coffee genotype. In general, however, old leaves were more susceptible than adult or young leaves.
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