Chlorotic leaf distortion

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Causal organism: Fusarium denticulatum Nirenberg and O’Donnell


Youngest leaves are generally chlorotic and may be distorted (C. Clark).


Fungal mycelium may be seen as fine white deposits on the leaf (C. Clark).

Diagnostic summary

  • What you see on plants

- youngest 2-3 leaves of vine tips become generally chlorotic, sometimes becoming bright yellow, almost bleached in appearance. As the leaves mature, they regain most of their normal colour.

- leaves may become pink on cultivars that normally have purple leaves.

- marginal necrosis may develop on affected leaves following extended periods of sunny and humid weather.

- mycelia may be seen growing out from between halves of leaves that have not yet opened or as scattered clumps on the upper surface of more mature leaves which may appear similar to salt deposits.

- on some cultivars affected leaves may be twisted or distorted.

  • Development is strongly favoured by warm, sunny, humid weather.

  • Whole plants can recover and become symptomless after only a few days of cloudy, cool or dry weather.


Economic importance

Geographical distribution



Biology and ecology

Host range






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