Abstract
SYMPTOMS of an unknown disorder have been increasingly observed on pepper vines since 1956 ; no pathogen seemed to be involved. Affected vines show an overall bright green to yellow colour and their leaves a pronounced droop. Individual leaves first show symptoms of a speckled necrosis mostly along the main veins, each brown spot having a surrounding yellow halo. Afterwards the necrotic areas spread and become more serious so that finally the leaves fall. These vines have a greatly reduced root system, which dies off centripetally. Different stages of the leaf symptoms are shown in Fig. 1.
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DE WAARD, P., SUTTON, C. Toxicity of Aluminium to Black Pepper (Piper nigrum L.) in Sarawak. Nature 188, 1129–1130 (1960). https://doi.org/10.1038/1881129a0
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DOI: https://doi.org/10.1038/1881129a0
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