The role of hairs on the wettability of grapevine (<i>Vitis</i> spp.) leaves

Authors

  • A. Kortekamp
  • R. Wind
  • Eva Zyprian

DOI:

https://doi.org/10.5073/vitis.1999.38.101-105

Keywords:

downy mildew, low temperature scanning electron microscopy, Plasmopara viticola, pubescence, resistance, trichomes, Vitis, water adhesion

Abstract

Hairs represent an important physico-chemical factor on abaxial leaf surfaces of grapevine and can influence the wettability of leaves. This was demonstrated by scanning electron micrographs and monitored with a new method using a torsion balance. Forces necessary to remove water droplets of distinct size from leaves were lower in case of pubescent (0,2-0,4 mN) compared to non-pubescent vine leaves (0,4-1,2 mN). Depending on the number of hairs and their surface structure the deposition and distribution of water droplets originating from dew and rain can be prevented due to weak adhesion. Thus, surface features enabling water droplets to pearl off may reduce the probability of infection by fungal spores.

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Published

2015-07-30

Issue

Vol. 38 No. 3 (1999): Vitis

Section

Article

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