The effect of coffee leaf rust on foliation and yield of coffee in Papua New Guinea
1995
Brown, J.S. | Whan, J.H. | Kenny, M.K. | Merriman, P.R.
Coffee leaf rust epidemics of varying severity were created by application of fungicide treatments, of varying concentration, to experimental plots from 1989 to 1992. Detailed measurements of disease incidence and leaf fall showed that yield and foliation (number of leaves per lateral) in 1991 was affected by the disease incidence in the previous season. Analysis showed a significantly greater influence of disease on foliation, both within and between seasons, than on yield. This was confirmed by data from 1992. It was concluded that the effect of the disease on yield is indirect through induction of defoliation.
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