Toxicity of aluminium to black pepper (piper nigrum L.) in Sarawak
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...
| Main Authors: | , |
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| Format: | Article |
| Published: |
Nature Publishing Group
1960
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| Online Access: | http://psasir.upm.edu.my/id/eprint/115007/ |
| Summary: | 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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